{"id":26645,"date":"2021-11-01T12:55:25","date_gmt":"2021-11-01T12:55:25","guid":{"rendered":"https:\/\/adenilsongiovanini.com.br\/blog\/?p=26645"},"modified":"2023-08-02T00:19:38","modified_gmt":"2023-08-02T00:19:38","slug":"sistemas-geodesicos-de-referencia","status":"publish","type":"post","link":"https:\/\/adenilsongiovanini.com.br\/blog\/sistemas-geodesicos-de-referencia\/","title":{"rendered":"Sistemas Geod\u00e9sicos de Refer\u00eancia?"},"content":{"rendered":"<p><span style=\"font-size: 20px; font-family: arial, helvetica, sans-serif; color: #000000; line-height: 1.3;\"><strong>Sistemas geod\u00e9sicos de refer\u00eancia<\/strong>, voc\u00ea acabou de encontrar um artigo definitivo a respeito do tema. <\/span><\/p>\n<p><span style=\"font-size: 20px; font-family: arial, helvetica, sans-serif; color: #000000; line-height: 1.3;\">Com a leitura do mesmo voc\u00ea aprender\u00e1:<\/span><\/p>\n<ul>\n<li><span style=\"font-size: 20px; font-family: arial, helvetica, sans-serif; color: #000000; line-height: 1.3;\">O que \u00e9 um <strong>sistemas geod\u00e9sicos de refer\u00eancia<\/strong>;<\/span><\/li>\n<li><span style=\"font-size: 20px; font-family: arial, helvetica, sans-serif; color: #000000; line-height: 1.3;\">Quais os <strong>par\u00e2metros<\/strong> de um sistema geod\u00e9sico de refer\u00eancia;<\/span><\/li>\n<li><span style=\"font-size: 20px; font-family: arial, helvetica, sans-serif; color: #000000; line-height: 1.3;\">Porque foi necess\u00e1ria a cria\u00e7\u00e3o de elipsoides;<\/span><\/li>\n<li><span style=\"font-size: 20px; font-family: arial, helvetica, sans-serif; color: #000000; line-height: 1.3;\">Sistema geod\u00e9sicos<strong> topoc\u00eantricos e geoc\u00eantricos<\/strong>;<\/span><\/li>\n<li><span style=\"font-size: 20px; font-family: arial, helvetica, sans-serif; color: #000000; line-height: 1.3;\">Quais os <strong>principais sistemas geod\u00e9sicos existentes<\/strong> e;<\/span><\/li>\n<li><span style=\"font-size: 20px; font-family: arial, helvetica, sans-serif; color: #000000; line-height: 1.3;\">Como \u00e9 feita a materializa\u00e7\u00e3o de um sistema de refer\u00eancia.<\/span><\/li>\n<\/ul>\n<p><span style=\"font-size: 20px; font-family: arial, helvetica, sans-serif; color: #000000; line-height: 1.3;\">Vou abrir meu ba\u00fa do tesouro. Prossiga a leitura com m\u00e1xima aten\u00e7\u00e3o.<\/span><\/p>\n<p>&nbsp;<\/p>\n<h2 style=\"text-align: center;\"><span style=\"font-size: 24px;\"><strong><span style=\"font-family: arial, helvetica, sans-serif; color: #000000; line-height: 1.3;\">O que s\u00e3o os sistemas geod\u00e9sicos de refer\u00eancia<\/span><\/strong><\/span><\/h2>\n<p><img decoding=\"async\" class=\"aligncenter size-full wp-image-26642\" src=\"https:\/\/adenilsongiovanini.com.br\/blog\/wp-content\/uploads\/2021\/10\/datum-wgs-84.png\" alt=\"sistemas geod\u00e9sicos de refer\u00eancia\" width=\"678\" height=\"322\" srcset=\"https:\/\/adenilsongiovanini.com.br\/blog\/wp-content\/uploads\/2021\/10\/datum-wgs-84.png 678w, https:\/\/adenilsongiovanini.com.br\/blog\/wp-content\/uploads\/2021\/10\/datum-wgs-84-300x142.png 300w\" sizes=\"(max-width: 678px) 100vw, 678px\" \/><\/p>\n<p><span style=\"font-size: 20px; font-family: arial, helvetica, sans-serif; color: #000000; line-height: 1.3;\">Os <strong>sistemas geod\u00e9sicos de refer\u00eancia<\/strong> possibilita a determina\u00e7\u00e3o da localiza\u00e7\u00e3o de qualquer detalhe existente na superf\u00edcie terrestre.<\/span><\/p>\n<p><span style=\"font-size: 20px; font-family: arial, helvetica, sans-serif; color: #000000; line-height: 1.3;\">Os mesmos s\u00e3o <strong>figuras geom\u00e9tricas<\/strong> representativas da superf\u00edcie da terra que s\u00e3o utilizadas na <span style=\"color: #0000ff;\"><a href=\"https:\/\/adenilsongiovanini.com.br\/blog\/curso-de-cartografia\/\" style=\"color: #0000ff;\">Cartografia<\/a><\/span>, na <span style=\"color: #0000ff;\"><a style=\"color: #0000ff;\" href=\"https:\/\/adenilsongiovanini.com.br\/blog\/geodesia-conceito-objetivos-e-aplicacoes\/\">Geod\u00e9sia<\/a><\/span> e na <span style=\"color: #0000ff;\"><a style=\"color: #0000ff;\" href=\"https:\/\/adenilsongiovanini.com.br\/blog\/posicionamento-pelo-gnss-georreferenciamento\/\">navega\u00e7\u00e3o por sat\u00e9lite<\/a><\/span>, permitindo que cada ponto da superf\u00edcie tenha um conjunto de coordenadas \u00fanico (X, Y e Z).<\/span><\/p>\n<p>&nbsp;<\/p>\n<h2 style=\"text-align: center;\"><span style=\"color: #000000; font-size: 24px; font-family: arial, helvetica, sans-serif;\"><strong>Quais os par\u00e2metros dos sistemas geod\u00e9sicos de refer\u00eancia<\/strong><\/span><\/h2>\n<p><span style=\"font-size: 20px;\"><img decoding=\"async\" class=\"aligncenter size-full wp-image-5128\" src=\"http:\/\/adenilsongiovanini.com.br\/blog\/wp-content\/uploads\/2020\/01\/sistema-de-refer\u00eancia.jpg\" alt=\"sistemas de refer\u00eancia\" width=\"728\" height=\"546\" srcset=\"https:\/\/adenilsongiovanini.com.br\/blog\/wp-content\/uploads\/2020\/01\/sistema-de-refer\u00eancia.jpg 728w, https:\/\/adenilsongiovanini.com.br\/blog\/wp-content\/uploads\/2020\/01\/sistema-de-refer\u00eancia-300x225.jpg 300w\" sizes=\"(max-width: 728px) 100vw, 728px\" \/><\/span><\/p>\n<p><span style=\"font-size: 20px; font-family: arial, helvetica, sans-serif; color: #000000; line-height: 1.3;\">Provavelmente no seu dia a dia voc\u00ea em alguns momentos escute o termo <span style=\"color: #0000ff;\"><a style=\"color: #0000ff;\" href=\"https:\/\/adenilsongiovanini.com.br\/blog\/sistema-de-referencia\/\">sistema de refer\u00eancia<\/a><\/span>, em outros a palavra <span style=\"color: #0000ff;\"><a href=\"http:\/\/adenilsongiovanini.com.br\/blog\/datum-o-que-e-e-para-que-serve\/\" target=\"_blank\" rel=\"noopener noreferrer\" style=\"color: #0000ff;\">datum<\/a><\/span>. A verdade \u00e9 que <strong>datum<\/strong>, <strong>sistema de refer\u00eancia<\/strong> e <strong>sistema geod\u00e9sico de refer\u00eancia<\/strong> s\u00e3o a mesma coisa.<\/span><\/p>\n<p><span style=\"font-size: 20px; font-family: arial, helvetica, sans-serif; color: #000000; line-height: 1.3;\">Na realidade, um <strong>sistema geod\u00e9sico de refer\u00eancia<\/strong> nada mais \u00e9 do que um<strong> <em>modelo matem\u00e1tico te\u00f3rico que representa a superf\u00edcie da terra<\/em><\/strong>. <\/span><\/p>\n<p><span style=\"font-size: 20px; font-family: arial, helvetica, sans-serif; color: #000000; line-height: 1.3;\">Todo sistema geod\u00e9sico de refer\u00eancia possui 3 par\u00e2metros. S\u00e3o eles:<\/span><\/p>\n<ul>\n<li><span style=\"font-size: 20px; font-family: arial, helvetica, sans-serif; color: #000000; line-height: 1.3;\">Um ponto de amarra\u00e7\u00e3o;<\/span><\/li>\n<li><span style=\"font-size: 20px; font-family: arial, helvetica, sans-serif; color: #000000; line-height: 1.3;\">Um norte (orienta\u00e7\u00e3o);<\/span><\/li>\n<li><span style=\"font-size: 20px; font-family: arial, helvetica, sans-serif; color: #000000; line-height: 1.3;\">Um elipsoide.<\/span><\/li>\n<\/ul>\n<p><img decoding=\"async\" class=\"aligncenter size-full wp-image-3939\" src=\"https:\/\/adenilsongiovanini.com.br\/blog\/wp-content\/uploads\/2019\/12\/datum.png\" alt=\"datum\" width=\"679\" height=\"385\" srcset=\"https:\/\/adenilsongiovanini.com.br\/blog\/wp-content\/uploads\/2019\/12\/datum.png 679w, https:\/\/adenilsongiovanini.com.br\/blog\/wp-content\/uploads\/2019\/12\/datum-300x170.png 300w\" sizes=\"(max-width: 679px) 100vw, 679px\" \/><\/p>\n<p><span style=\"color: #000000; font-size: 20px; font-family: arial, helvetica, sans-serif; line-height: 1.3;\">O surgimento dos <strong>sistemas geod\u00e9sicos de refer\u00eancia<\/strong> foi necess\u00e1rio justamente pela necessidade de se amarrar as diferentes superf\u00edcies existentes:<\/span><\/p>\n<ul>\n<li><span style=\"font-family: arial, helvetica, sans-serif; font-size: 20px;\"><span style=\"color: #0000ff;\"><a style=\"color: #0000ff;\" href=\"https:\/\/pt.wikipedia.org\/wiki\/Geoide\" target=\"_blank\" rel=\"noopener noreferrer\">Geoide<\/a><\/span><span style=\"color: #000000;\">;<\/span><\/span><\/li>\n<li><span style=\"color: #000000; font-size: 20px; font-family: arial, helvetica, sans-serif; line-height: 1.3;\"><span style=\"color: #0000ff;\"><a style=\"color: #0000ff;\" href=\"https:\/\/pt.wikipedia.org\/wiki\/Elipsoide\" target=\"_blank\" rel=\"noopener noreferrer\">Elipsoide<\/a><\/span> e;<\/span><\/li>\n<li><span style=\"color: #000000; font-size: 20px; font-family: arial, helvetica, sans-serif; line-height: 1.3;\">Superf\u00edcie f\u00edsica.<\/span><\/li>\n<\/ul>\n<p><span style=\"color: #000000; font-size: 20px; font-family: arial, helvetica, sans-serif;\">A <span style=\"color: #0000ff;\"><a style=\"color: #0000ff; line-height: 1.3;\" href=\"http:\/\/www.carto.eng.uerj.br\/cdecart\/download\/NBR14166.pdf\" target=\"_blank\" rel=\"noopener noreferrer\">NBR 14.166<\/a><\/span>, em sua contracapa traz uma imagem que ajudar\u00e1 voc\u00ea a entender melhor estas superf\u00edcies.<\/span><\/p>\n<p><span style=\"color: #000000; font-size: 20px; font-family: arial, helvetica, sans-serif;\"><img decoding=\"async\" class=\"aligncenter wp-image-3664 size-large\" src=\"https:\/\/adenilsongiovanini.com.br\/blog\/wp-content\/uploads\/2019\/11\/nbr-14.166-datum-elipsoide-780x509.png\" alt=\"sistemas geod\u00e9sicos de refer\u00eancia, nbr 14.166, datum e elipsoide\" width=\"780\" height=\"509\" srcset=\"https:\/\/adenilsongiovanini.com.br\/blog\/wp-content\/uploads\/2019\/11\/nbr-14.166-datum-elipsoide-780x509.png 780w, https:\/\/adenilsongiovanini.com.br\/blog\/wp-content\/uploads\/2019\/11\/nbr-14.166-datum-elipsoide-300x196.png 300w, https:\/\/adenilsongiovanini.com.br\/blog\/wp-content\/uploads\/2019\/11\/nbr-14.166-datum-elipsoide-768x501.png 768w, https:\/\/adenilsongiovanini.com.br\/blog\/wp-content\/uploads\/2019\/11\/nbr-14.166-datum-elipsoide.png 1167w\" sizes=\"(max-width: 780px) 100vw, 780px\" \/><\/span><\/p>\n<p>&nbsp;<\/p>\n<p><span style=\"color: #000000; font-size: 20px; font-family: arial, helvetica, sans-serif; line-height: 1.3;\">Perceba que conforme informei, existe a superf\u00edcie f\u00edsica, o geoide e o elipsoide.<\/span><\/p>\n<p><span style=\"color: #000000; font-size: 20px; font-family: arial, helvetica, sans-serif; line-height: 1.3;\">Al\u00e9m disso, existe a <span style=\"color: #0000ff;\"><a style=\"color: #0000ff;\" href=\"https:\/\/adenilsongiovanini.com.br\/blog\/altitude-ortometrica\/\" target=\"_blank\" rel=\"noopener noreferrer\">altitude geom\u00e9trica<\/a><\/span>, que \u00e9 em rela\u00e7\u00e3o ao elipsoide e a <a href=\"http:\/\/adenilsongiovanini.com.br\/blog\/altitude-ortometrica\/\" target=\"_blank\" rel=\"noopener noreferrer\"><span style=\"color: #0000ff;\">altitude ortom\u00e9trica<\/span><\/a> que \u00e9 em rela\u00e7\u00e3o ao geoide.<\/span><\/p>\n<p><span style=\"color: #000000; font-size: 20px; font-family: arial, helvetica, sans-serif; line-height: 1.3;\">Diante da exist\u00eancia destas superf\u00edcies, o problema enfrentado pelos <span style=\"color: #0000ff;\"><a style=\"color: #0000ff;\" href=\"https:\/\/educalingo.com\/pt\/dic-pt\/cartografo\" target=\"_blank\" rel=\"noopener noreferrer\">cart\u00f3grafos<\/a><\/span> era como amarar as mesmas.<\/span><\/p>\n<p><span style=\"color: #000000; font-size: 20px; font-family: arial, helvetica, sans-serif; line-height: 1.3;\">Por exemplo, a altitude obtida com <span style=\"color: #0000ff;\"><a href=\"http:\/\/adenilsongiovanini.com.br\/blog\/receptor-gnss-quando-utilizar\/\" target=\"_blank\" rel=\"noopener noreferrer\" style=\"color: #0000ff;\">receptores GNSS<\/a><\/span> \u00e9 em rela\u00e7\u00e3o ao elipsoide, ou seja, altitude geom\u00e9trica. Por\u00e9m, a mesma n\u00e3o pode ser utilizada em obras de engenharia.<\/span><\/p>\n<p><span style=\"color: #000000; font-size: 20px; font-family: arial, helvetica, sans-serif; line-height: 1.3;\">Isso porque em <strong>obras de engenharia, deve-se utilizar a altitude ortom\u00e9trica<\/strong> que \u00e9 em rela\u00e7\u00e3o ao geoide.<\/span><\/p>\n<p><span style=\"color: #000000; font-size: 20px; font-family: arial, helvetica, sans-serif; line-height: 1.3;\">Enfim, os Cart\u00f3grafos precisavam de alguma maneira amarrar as diferentes superf\u00edcies e altitudes existentes.<\/span><\/p>\n<p><span style=\"color: #000000; font-size: 20px; font-family: arial, helvetica, sans-serif; line-height: 1.3;\">Foi neste contexto que os mesmos criaram o sistema geod\u00e9sico de refer\u00eancia. Conforme expliquei anteriormenteo mesmo <strong>possui 3 par\u00e2metros<\/strong>. S\u00e3o eles:<\/span><\/p>\n<ul>\n<li><span style=\"color: #000000; font-size: 20px; font-family: arial, helvetica, sans-serif; line-height: 1.3;\">Um elipsoide;<\/span><\/li>\n<li><span style=\"color: #000000; font-size: 20px; font-family: arial, helvetica, sans-serif; line-height: 1.3;\">Um ponto de amarra\u00e7\u00e3o que serve para amarar o elipsoide a superf\u00edcie f\u00edsica e ao geoide;<\/span><\/li>\n<li><span style=\"color: #000000; font-size: 20px; font-family: arial, helvetica, sans-serif; line-height: 1.3;\">E um norte que faz com que o datum fique orientado de maneira certa.<\/span><\/li>\n<\/ul>\n<p>\n<span style=\"color: #000000; font-size: 20px; font-family: arial, helvetica, sans-serif; line-height: 1.3;\">Perceba que \u00e9 por isso que quando se utiliza um <span style=\"color: #0000ff;\"><a style=\"color: #0000ff;\" href=\"https:\/\/adenilsongiovanini.com.br\/blog\/software-sig-os-14-principais\/\">software de geoprocessamento<\/a><\/span>, o que se faz \u00e9 a transforma\u00e7\u00e3o, por exemplo:<\/span><\/p>\n<p><span style=\"color: #000000; font-size: 20px; font-family: arial, helvetica, sans-serif; line-height: 1.3;\">Do <span style=\"color: #0000ff;\"><a href=\"http:\/\/adenilsongiovanini.com.br\/blog\/sad69\/\" target=\"_blank\" rel=\"noopener noreferrer\" style=\"color: #0000ff;\">datum SAD 69<\/a><\/span> para o <span style=\"color: #0000ff;\"><a href=\"http:\/\/adenilsongiovanini.com.br\/blog\/sirgas-2000\/\" target=\"_blank\" rel=\"noopener noreferrer\" style=\"color: #0000ff;\">datum SIRGAS 2000<\/a><\/span>!<\/span><\/p>\n<p><span style=\"font-size: 20px;\"><span style=\"color: #000000; font-family: arial, helvetica, sans-serif; line-height: 1.3;\">E n\u00e3o do <\/span><span style=\"color: #000000; font-family: arial, helvetica, sans-serif; line-height: 1.3;\">Elipsoide sad 69 para o elipsoide SIRGAS 2000.<\/span><\/span><\/p>\n<p><span style=\"color: #000000; font-size: 20px; font-family: arial, helvetica, sans-serif; line-height: 1.3;\">Perceba que o elipsoide \u00e9 apenas um dos par\u00e2metros que comp\u00f5em o datum (lembre-se que datum e <strong>sistema geod\u00e9sico de refer\u00eancia<\/strong> s\u00e3o a mesma coisa).<\/span><\/p>\n<p><span style=\"color: #000000; font-size: 20px; font-family: arial, helvetica, sans-serif; line-height: 1.3;\"><strong>Detalhe at\u00edpico<\/strong>: O plural da palavra datum \u00e9 data e n\u00e3o &#8220;datuns&#8221; como a regra geral nos induz a acreditar. <\/span><\/p>\n<p><span style=\"color: #000000; font-size: 20px; font-family: arial, helvetica, sans-serif; line-height: 1.3;\">Por exemplo:<\/span><\/p>\n<p><span style=\"color: #000000; font-size: 20px; font-family: arial, helvetica, sans-serif; line-height: 1.3;\">&#8220;Os data SAD 69 e SIRGAS 2000 s\u00e3o geoc\u00eantricos&#8221;.<\/span><\/p>\n<p>&nbsp;<\/p>\n<h2 style=\"text-align: center;\"><span style=\"font-size: 24px;\"><strong><span style=\"color: #000000; font-family: arial, helvetica, sans-serif; line-height: 1.3;\">Sistemas geod\u00e9sicos de refer\u00eancia &#8211; Porque foi necess\u00e1ria a cria\u00e7\u00e3o de elipsoides?<\/span><\/strong><\/span><\/h2>\n<p><span style=\"font-size: 20px;\"><img decoding=\"async\" class=\"aligncenter size-full wp-image-19735\" src=\"https:\/\/adenilsongiovanini.com.br\/blog\/wp-content\/uploads\/2021\/05\/elipsoide-com-abaloamento-nos-polos.jpg\" alt=\"elipsoide - sistemas geod\u00e9sicos de refer\u00eancia\" width=\"640\" height=\"480\" srcset=\"https:\/\/adenilsongiovanini.com.br\/blog\/wp-content\/uploads\/2021\/05\/elipsoide-com-abaloamento-nos-polos.jpg 640w, https:\/\/adenilsongiovanini.com.br\/blog\/wp-content\/uploads\/2021\/05\/elipsoide-com-abaloamento-nos-polos-300x225.jpg 300w, https:\/\/adenilsongiovanini.com.br\/blog\/wp-content\/uploads\/2021\/05\/elipsoide-com-abaloamento-nos-polos-320x240.jpg 320w, https:\/\/adenilsongiovanini.com.br\/blog\/wp-content\/uploads\/2021\/05\/elipsoide-com-abaloamento-nos-polos-360x270.jpg 360w\" sizes=\"(max-width: 640px) 100vw, 640px\" \/><\/span><\/p>\n<p><span style=\"color: #000000; font-size: 20px; font-family: arial, helvetica, sans-serif; line-height: 1.3;\">Talvez voc\u00ea esteja pensando:<\/span><\/p>\n<p><strong><span style=\"color: #000000; font-size: 20px; font-family: arial, helvetica, sans-serif; line-height: 1.3;\">Professor Adenilson, m<\/span><span style=\"color: #000000; font-size: 20px; font-family: arial, helvetica, sans-serif; line-height: 1.3;\">as porque \u00e9 que existe o geoide e o elipsoide? <\/span><\/strong><\/p>\n<p><span style=\"color: #000000; font-size: 20px; font-family: arial, helvetica, sans-serif; line-height: 1.3;\">A exist\u00eancia de apenas uma destas superf\u00edcies n\u00e3o seria o suficiente?<\/span><\/p>\n<p><span style=\"color: #000000; font-size: 20px; font-family: arial, helvetica, sans-serif; line-height: 1.3;\">Para entender o porque desta necessidade, voc\u00ea precisa entender a evolu\u00e7\u00e3o da forma da terra.<\/span><\/p>\n<p><span style=\"color: #000000; font-size: 20px; font-family: arial, helvetica, sans-serif; line-height: 1.3;\">No inicio, as pessoas consideravam a forma terra plana. Com o tempo, passamos a considerar a mesma um esfera.<\/span><\/p>\n<p><span style=\"color: #000000; font-size: 20px; font-family: arial, helvetica, sans-serif; line-height: 1.3;\">Por\u00e9m, existia o mar e as montanhas. Desta maneira, com o tempo, os cart\u00f3grafos chegaram ao conceito de geoide.<\/span><\/p>\n<p><span style=\"color: #000000; font-size: 20px; font-family: arial, helvetica, sans-serif; line-height: 1.3;\">O<strong> geoide<\/strong> possui como conceito:<\/span><\/p>\n<blockquote style=\"border: 2px double #009900; background: #f0fff0 none repeat scroll 0% 0%; -moz-background-clip: -moz-initial; -moz-background-origin: -moz-initial; -moz-background-inline-policy: -moz-initial; color: #323232; padding-left: 15px; padding-top: 10px; padding-bottom: 10px;\">\n<p><span style=\"font-size: 20px; font-family: arial, helvetica, sans-serif; color: #000000; line-height: 1.3;\">O n\u00edvel m\u00e9dio dos mares, suposto em equil\u00edbrio, prolongado para dentro dos continente e sobre a influ\u00eancia da massa da terra e da for\u00e7a da gravidade.<\/span><\/p>\n<\/blockquote>\n<p>&nbsp;<\/p>\n<p><span style=\"color: #000000; font-size: 20px; font-family: arial, helvetica, sans-serif; line-height: 1.3;\">Esta forma, geoidal, \u00e9 a forma que mais se aproxima a forma real do planeta. S\u00f3 existia um problema, o posicionamento sobre a mesma necessitava da utiliza\u00e7\u00e3o de formulas matem\u00e1ticas complexas.<\/span><\/p>\n<p><span style=\"color: #000000; font-size: 20px; font-family: arial, helvetica, sans-serif; line-height: 1.3;\">Com isso, os cart\u00f3grafos perceberam que precisavam criar uma forma mais simples. Uma forma matem\u00e1tica que fosse mais f\u00e1cil de ser utilizada pelos profissionais.<\/span><\/p>\n<p><span style=\"color: #000000; font-size: 20px; font-family: arial, helvetica, sans-serif; line-height: 1.3;\">Foi ent\u00e3o que foi criado o elipsoide.<\/span><\/p>\n<p>&nbsp;<\/p>\n<p><span style=\"color: #000000; font-size: 20px; font-family: arial, helvetica, sans-serif;\"><img decoding=\"async\" class=\"aligncenter size-full wp-image-3666\" src=\"http:\/\/adenilsongiovanini.com.br\/blog\/wp-content\/uploads\/2019\/11\/elipsoide.png\" alt=\"elipsoide\" width=\"503\" height=\"426\" srcset=\"https:\/\/adenilsongiovanini.com.br\/blog\/wp-content\/uploads\/2019\/11\/elipsoide.png 503w, https:\/\/adenilsongiovanini.com.br\/blog\/wp-content\/uploads\/2019\/11\/elipsoide-300x254.png 300w\" sizes=\"(max-width: 503px) 100vw, 503px\" \/><\/span><\/p>\n<p>&nbsp;<\/p>\n<p><span style=\"color: #000000; font-size: 20px; font-family: arial, helvetica, sans-serif; line-height: 1.3;\">O mesmo \u00e9 uma forma matem\u00e1tica dotada de 2 par\u00e2metros, s\u00e3o eles:<\/span><\/p>\n<ul>\n<li><span style=\"color: #000000; font-size: 20px; font-family: arial, helvetica, sans-serif; line-height: 1.3;\">Semi-eixo menor e;<\/span><\/li>\n<li><span style=\"color: #000000; font-size: 20px; font-family: arial, helvetica, sans-serif; line-height: 1.3;\">Semi-eixo maior;<\/span><\/li>\n<\/ul>\n<p><span style=\"color: #000000; font-size: 20px; font-family: arial, helvetica, sans-serif;\"><img decoding=\"async\" class=\"aligncenter size-full wp-image-3667\" src=\"http:\/\/adenilsongiovanini.com.br\/blog\/wp-content\/uploads\/2019\/11\/par\u00e2metros-do-elips\u00f3ide.jpg\" alt=\"Sistema de refer\u00eancia e os par\u00e2metros do elips\u00f3ide\" width=\"529\" height=\"324\" srcset=\"https:\/\/adenilsongiovanini.com.br\/blog\/wp-content\/uploads\/2019\/11\/par\u00e2metros-do-elips\u00f3ide.jpg 529w, https:\/\/adenilsongiovanini.com.br\/blog\/wp-content\/uploads\/2019\/11\/par\u00e2metros-do-elips\u00f3ide-300x184.jpg 300w\" sizes=\"(max-width: 529px) 100vw, 529px\" \/><\/span><\/p>\n<p><span style=\"color: #000000; font-size: 20px; font-family: arial, helvetica, sans-serif; line-height: 1.3;\">Por causa disso, foi que passou-se a existir o geoide e o elipsoide e consequentemente 2 altitudes:<\/span><\/p>\n<ul>\n<li><span style=\"color: #000000; font-size: 20px; font-family: arial, helvetica, sans-serif; line-height: 1.3;\"><strong>Altitude Geom\u00e9trica<\/strong> (ou elipsoidal) &#8211; Em rela\u00e7\u00e3o ao elipsoide e;<\/span><\/li>\n<li><span style=\"color: #000000; font-size: 20px; font-family: arial, helvetica, sans-serif; line-height: 1.3;\"><strong>Altitude Ortom\u00e9trica<\/strong> &#8211; Em rela\u00e7\u00e3o ao geoide.<\/span><\/li>\n<\/ul>\n<p><span style=\"color: #000000; font-size: 20px; font-family: arial, helvetica, sans-serif; line-height: 1.3;\">Naturalmente, o pr\u00f3ximo passo na evolu\u00e7\u00e3o seria, de alguma maneira amarrar-se tudo. Isso porque a <span style=\"color: #0000ff;\"><a href=\"https:\/\/adenilsongiovanini.com.br\/blog\/altimetrica-diferenca-entre-cota-e-altitude\/\" style=\"color: #0000ff;\">altitude geom\u00e9trica<\/a><\/span> n\u00e3o pode ser utilizada em obras de engenharia.<\/span><\/p>\n<p><span style=\"color: #000000; font-size: 20px; font-family: arial, helvetica, sans-serif; line-height: 1.3;\">Neste contexto, foi que criou-se o sistema geod\u00e9sico de refer\u00eancia. O mesmo faz a amarra\u00e7\u00e3o entre o geoide, o elipsoide e a superf\u00edcie topogr\u00e1fica.<\/span><\/p>\n<p>&nbsp;<\/p>\n<h2 style=\"text-align: center;\"><span style=\"font-size: 24px;\"><strong><span style=\"color: #000000; font-family: arial, helvetica, sans-serif; line-height: 1.3;\">Sistemas geod\u00e9sicos topoc\u00eantricos e geoc\u00eantricos<\/span><\/strong><\/span><\/h2>\n<p><span style=\"color: #000000; font-size: 20px; font-family: arial, helvetica, sans-serif; line-height: 1.3;\">Um sistema geod\u00e9sico de refer\u00eancia pode ser topoc\u00eantrico ou geoc\u00eantrico.<\/span><\/p>\n<p>&nbsp;<\/p>\n<h3 style=\"text-align: center;\"><strong><span style=\"color: #000000; font-size: 20px; font-family: arial, helvetica, sans-serif; line-height: 1.3;\">Sistema geod\u00e9sico de refer\u00eancia topoc\u00eantrico<\/span><\/strong><\/h3>\n<p><img decoding=\"async\" class=\"aligncenter size-large wp-image-26647\" src=\"https:\/\/adenilsongiovanini.com.br\/blog\/wp-content\/uploads\/2021\/11\/sistema-geodesico-de-referencia-topocentrico-780x545.png\" alt=\"sistemas geod\u00e9sicos de refer\u00eancia topoc\u00eantricos\" width=\"780\" height=\"545\" srcset=\"https:\/\/adenilsongiovanini.com.br\/blog\/wp-content\/uploads\/2021\/11\/sistema-geodesico-de-referencia-topocentrico-780x545.png 780w, https:\/\/adenilsongiovanini.com.br\/blog\/wp-content\/uploads\/2021\/11\/sistema-geodesico-de-referencia-topocentrico-300x210.png 300w, https:\/\/adenilsongiovanini.com.br\/blog\/wp-content\/uploads\/2021\/11\/sistema-geodesico-de-referencia-topocentrico-768x537.png 768w, https:\/\/adenilsongiovanini.com.br\/blog\/wp-content\/uploads\/2021\/11\/sistema-geodesico-de-referencia-topocentrico.png 850w\" sizes=\"(max-width: 780px) 100vw, 780px\" \/><\/p>\n<p><span style=\"color: #000000; font-size: 20px; font-family: arial, helvetica, sans-serif; line-height: 1.3;\">Nos <strong>sistemas geod\u00e9sicos topoc\u00eantricos<\/strong> o centro do elipsoide (origem dos eixos) est\u00e1 localizado em um ponto de origem situado na superf\u00edcie terrestre.<\/span><\/p>\n<p><span style=\"color: #000000; font-size: 20px; font-family: arial, helvetica, sans-serif; line-height: 1.3;\">Como exemplos de sistemas geod\u00e9sicos topoc\u00eantricos temos o <span style=\"color: #0000ff;\"><a style=\"color: #0000ff;\" href=\"https:\/\/adenilsongiovanini.com.br\/blog\/sad69\/\">SAD 69<\/a><\/span> e o<span style=\"color: #0000ff;\"><a style=\"color: #0000ff;\" href=\"https:\/\/adenilsongiovanini.com.br\/blog\/corrego-alegre\/\"> c\u00f3rrego Alegre<\/a><\/span>.<\/span><\/p>\n<p>&nbsp;<\/p>\n<h3 style=\"text-align: center;\"><strong><span style=\"color: #000000; font-size: 20px; font-family: arial, helvetica, sans-serif; line-height: 1.3;\">Sistema geod\u00e9sico de refer\u00eancia geoc\u00eantrico<\/span><\/strong><\/h3>\n<p><img decoding=\"async\" class=\"aligncenter size-large wp-image-26648\" src=\"https:\/\/adenilsongiovanini.com.br\/blog\/wp-content\/uploads\/2021\/11\/sistema-geodesico-de-referencia-geocentrico-780x595.jpg\" alt=\"sistemas geod\u00e9sicos de refer\u00eancia geoc\u00eantricos\" width=\"780\" height=\"595\" srcset=\"https:\/\/adenilsongiovanini.com.br\/blog\/wp-content\/uploads\/2021\/11\/sistema-geodesico-de-referencia-geocentrico-780x595.jpg 780w, https:\/\/adenilsongiovanini.com.br\/blog\/wp-content\/uploads\/2021\/11\/sistema-geodesico-de-referencia-geocentrico-300x229.jpg 300w, https:\/\/adenilsongiovanini.com.br\/blog\/wp-content\/uploads\/2021\/11\/sistema-geodesico-de-referencia-geocentrico-768x586.jpg 768w, https:\/\/adenilsongiovanini.com.br\/blog\/wp-content\/uploads\/2021\/11\/sistema-geodesico-de-referencia-geocentrico.jpg 1024w\" sizes=\"(max-width: 780px) 100vw, 780px\" \/><\/p>\n<p><span style=\"color: #000000; font-size: 20px; font-family: arial, helvetica, sans-serif; line-height: 1.3;\">Nos <strong>sistemas geod\u00e9sicos geoc\u00eantricos<\/strong>, o eixo de rota\u00e7\u00e3o \u00e9 paralelo ao eixo de rota\u00e7\u00e3o da Terra, sendo que a origem est\u00e1 localizada no centro de massa da Terra.<\/span><\/p>\n<p><span style=\"color: #000000; font-size: 20px; font-family: arial, helvetica, sans-serif; line-height: 1.3;\">Como exemplos de sistemas geod\u00e9sicos geoc\u00eantricos temos o <span style=\"color: #0000ff;\"><a style=\"color: #0000ff;\" href=\"https:\/\/adenilsongiovanini.com.br\/blog\/wgs-84-historia-parametros-e-versoes\/\">WGS 84<\/a><\/span> e o<span style=\"color: #0000ff;\"><a style=\"color: #0000ff;\" href=\"https:\/\/adenilsongiovanini.com.br\/blog\/sirgas-2000\/\"> SIRGAS 2000<\/a><\/span>.<\/span><\/p>\n<p>&nbsp;<\/p>\n<p>&nbsp;<\/p>\n<h2 style=\"text-align: center;\"><span style=\"font-size: 24px; font-family: arial, helvetica, sans-serif; color: #000000; line-height: 1.3;\"><strong>Sistemas geod\u00e9sicos de refer\u00eancia &#8211; Principais existentes<\/strong><\/span><\/h2>\n<p><span style=\"font-size: 20px;\"><img decoding=\"async\" class=\"aligncenter wp-image-4931 size-large\" src=\"https:\/\/adenilsongiovanini.com.br\/blog\/wp-content\/uploads\/2019\/12\/sad-69-versus-sirgas-2000-780x585.jpg\" alt=\"SIRGAS-  Sistema de Refer\u00eancia Geoc\u00eantrico para as Am\u00e9ricas. Datum Global, Geoc\u00eantrico. SAD-69. Sistema Geod\u00e9sico Sul-Americano Datum Local, Topoc\u00eantrico. DATUM LOCAL. TOPOC\u00caNTRICO. \uf0b7 \uf0c5 REGI\u00c3O. MAPEADA. GE\u00d3IDE. ELIPS\u00d3IDE. DATUM GLOBAL. GEOC\u00caNTRICO. \uf0b7 \uf0c5 GE\u00d3IDE. ELIPS\u00d3IDE. Figura: J\u00falio D\u2019Alge.\" width=\"780\" height=\"585\" srcset=\"https:\/\/adenilsongiovanini.com.br\/blog\/wp-content\/uploads\/2019\/12\/sad-69-versus-sirgas-2000-780x585.jpg 780w, https:\/\/adenilsongiovanini.com.br\/blog\/wp-content\/uploads\/2019\/12\/sad-69-versus-sirgas-2000-300x225.jpg 300w, https:\/\/adenilsongiovanini.com.br\/blog\/wp-content\/uploads\/2019\/12\/sad-69-versus-sirgas-2000-768x576.jpg 768w, https:\/\/adenilsongiovanini.com.br\/blog\/wp-content\/uploads\/2019\/12\/sad-69-versus-sirgas-2000.jpg 960w\" sizes=\"(max-width: 780px) 100vw, 780px\" \/><\/span><br \/>\n<span style=\"font-size: 20px; font-family: arial, helvetica, sans-serif; color: #000000; line-height: 1.3;\">Ap\u00f3s a cria\u00e7\u00e3o do conceito <strong>datum<\/strong>, passou-se a existir-se um problema secund\u00e1rio, o mesmo utiliza um elipsoide de base, que possui apenas 2 par\u00e2metros.<\/span><\/p>\n<p><span style=\"color: #000000; font-family: arial, helvetica, sans-serif; font-size: 20px;\">Com isso, ao se configurar os par\u00e2metros para que o <strong>datum<\/strong> se adeque mais a determinada por\u00e7\u00e3o da superf\u00edcie terrestre, em outros locais, o mesmo ficava muito distante da superf\u00edcie.<\/span><\/p>\n<p><span style=\"font-size: 20px; font-family: arial, helvetica, sans-serif; color: #000000; line-height: 1.3;\">Com isso surgiram diferentes data, cada um se adequando mais a determinado continente ou pa\u00eds. <\/span><\/p>\n<p><span style=\"font-size: 20px; font-family: arial, helvetica, sans-serif; color: #000000; line-height: 1.3;\">A \u00fanica exce\u00e7\u00e3o \u00e9 o <span style=\"color: #0000ff;\"><a style=\"color: #0000ff;\" href=\"https:\/\/en.wikipedia.org\/wiki\/World_Geodetic_System\">WGS84<\/a>,<\/span> que tenta se adequar o melhor poss\u00edvel a todo o planeta. Com isso, mundialmente falando, existem v\u00e1rios DATA (plural de DATUM). <\/span><\/p>\n<p><span style=\"font-size: 20px; font-family: arial, helvetica, sans-serif; color: #000000; line-height: 1.3;\"> Veja na imagem abaixo os sistemas de refer\u00eancia <span style=\"color: #0000ff;\"><a style=\"color: #0000ff;\" href=\"http:\/\/adenilsongiovanini.com.br\/blog\/sad69\/\" target=\"_blank\" rel=\"noopener noreferrer\">SAD69<\/a><\/span> Alegre e WGS84.<\/span><\/p>\n<p>&nbsp;<\/p>\n<p><span style=\"font-size: 20px;\"><img decoding=\"async\" class=\"aligncenter wp-image-3673 size-large\" src=\"https:\/\/adenilsongiovanini.com.br\/blog\/wp-content\/uploads\/2019\/11\/sad-69-e-sirgas-WGS-84-780x348.jpeg\" alt=\"sad 69 e sirgas WGS 84\" width=\"780\" height=\"348\" srcset=\"https:\/\/adenilsongiovanini.com.br\/blog\/wp-content\/uploads\/2019\/11\/sad-69-e-sirgas-WGS-84-780x348.jpeg 780w, https:\/\/adenilsongiovanini.com.br\/blog\/wp-content\/uploads\/2019\/11\/sad-69-e-sirgas-WGS-84-300x134.jpeg 300w, https:\/\/adenilsongiovanini.com.br\/blog\/wp-content\/uploads\/2019\/11\/sad-69-e-sirgas-WGS-84-768x343.jpeg 768w, https:\/\/adenilsongiovanini.com.br\/blog\/wp-content\/uploads\/2019\/11\/sad-69-e-sirgas-WGS-84.jpeg 824w\" sizes=\"(max-width: 780px) 100vw, 780px\" \/><\/span><\/p>\n<p>&nbsp;<\/p>\n<p><span style=\"color: #000000; font-size: 20px; font-family: arial, helvetica, sans-serif; line-height: 1.3;\">Perceba que o <span style=\"color: #0000ff;\"><a style=\"color: #0000ff;\" href=\"https:\/\/adenilsongiovanini.com.br\/blog\/sad69\/\">SAD69<\/a><\/span> foi configurado sob medida para o Brasil, enquanto o WGS 84 tenta se adequar a todo o planeta.<\/span><\/p>\n<p><span style=\"font-size: 20px; font-family: arial, helvetica, sans-serif; color: #000000; line-height: 1.3;\">Por\u00e9m, no Brasil tr\u00eas sistemas de refer\u00eancia foram oficialmente reconhecidos pelo <span style=\"color: #0000ff;\"><a style=\"color: #0000ff;\" href=\"https:\/\/www.ibge.gov.br\/geociencias\/modelos-digitais-de-superficie\/modelos-digitais-de-superficie\/10855-modelo-de-ondulacao-geoidal.html?=&amp;t=o-que-e\" target=\"_blank\" rel=\"noopener noreferrer\">IBGE<\/a><\/span> (Instituto Brasileiro de Geografia e Estat\u00edstica) e utilizados por algum per\u00edodo.<\/span><\/p>\n<h3 style=\"text-align: center;\"><span style=\"font-size: 20px; font-family: arial, helvetica, sans-serif; color: #000000; line-height: 1.3;\"><strong>C\u00f3rrego Alegre (Sistema Geod\u00e9sico C\u00f3rrego Alegre)<\/strong><\/span><\/h3>\n<p><span style=\"font-size: 20px;\"><img decoding=\"async\" class=\"aligncenter wp-image-5118 size-large\" src=\"https:\/\/adenilsongiovanini.com.br\/blog\/wp-content\/uploads\/2020\/01\/sistemas-de-referencia-datum-e-de-coordenadas-780x219.jpg\" alt=\"Sistemas de refer\u00eancia - C\u00f3rrego Alegre\" width=\"780\" height=\"219\" srcset=\"https:\/\/adenilsongiovanini.com.br\/blog\/wp-content\/uploads\/2020\/01\/sistemas-de-referencia-datum-e-de-coordenadas-780x219.jpg 780w, https:\/\/adenilsongiovanini.com.br\/blog\/wp-content\/uploads\/2020\/01\/sistemas-de-referencia-datum-e-de-coordenadas-300x84.jpg 300w, https:\/\/adenilsongiovanini.com.br\/blog\/wp-content\/uploads\/2020\/01\/sistemas-de-referencia-datum-e-de-coordenadas-768x215.jpg 768w, https:\/\/adenilsongiovanini.com.br\/blog\/wp-content\/uploads\/2020\/01\/sistemas-de-referencia-datum-e-de-coordenadas.jpg 820w\" sizes=\"(max-width: 780px) 100vw, 780px\" \/><\/span><\/p>\n<p>&nbsp;<\/p>\n<p><span style=\"font-size: 20px; font-family: arial, helvetica, sans-serif; color: #000000; line-height: 1.3;\">O <span style=\"color: #0000ff;\"><a style=\"color: #0000ff;\" href=\"http:\/\/adenilsongiovanini.com.br\/blog\/corrego-alegre\/\" target=\"_blank\" rel=\"noopener noreferrer\">c\u00f3rrego alegre<\/a><\/span> foi adotado na d\u00e9cada de 50, tendo como par\u00e2metros:<\/span><\/p>\n<ul>\n<li><span style=\"font-size: 20px; font-family: arial, helvetica, sans-serif; color: #000000; line-height: 1.3;\">Ponto de amarra\u00e7\u00e3o &#8211; O ponto C\u00f3rrego Alegre;<\/span><\/li>\n<li><span style=\"font-size: 20px; font-family: arial, helvetica, sans-serif; color: #000000; line-height: 1.3;\">Elipsoide (superf\u00edcie de refer\u00eancia) &#8211; <span style=\"color: #0000ff;\">Elipsoide Internacional de Hayford de 1924<\/span>;<\/span><\/li>\n<li><span style=\"font-size: 20px; font-family: arial, helvetica, sans-serif; color: #000000; line-height: 1.3;\">Orienta\u00e7\u00e3o &#8211; Determinada astronomicamente.<\/span><\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n<h3 style=\"text-align: center;\"><span style=\"font-size: 20px; font-family: arial, helvetica, sans-serif; color: #000000; line-height: 1.3;\"><strong>SAD69<\/strong><\/span><\/h3>\n<p><span style=\"font-size: 20px;\"><img decoding=\"async\" class=\"aligncenter size-full wp-image-5107\" src=\"http:\/\/adenilsongiovanini.com.br\/blog\/wp-content\/uploads\/2020\/01\/sad69.png\" alt=\"sad69\" width=\"401\" height=\"378\" srcset=\"https:\/\/adenilsongiovanini.com.br\/blog\/wp-content\/uploads\/2020\/01\/sad69.png 401w, https:\/\/adenilsongiovanini.com.br\/blog\/wp-content\/uploads\/2020\/01\/sad69-300x283.png 300w\" sizes=\"(max-width: 401px) 100vw, 401px\" \/><\/span><\/p>\n<p><span style=\"font-size: 20px; font-family: arial, helvetica, sans-serif; color: #000000; line-height: 1.3;\">O IBGE atrav\u00e9s de PDF dispon\u00edvel em seu site, tr\u00e1s as seguintes informa\u00e7\u00f5es a respeito do SAD 69.<\/span><\/p>\n<blockquote style=\"border: 2px double #009900; background: #f0fff0 none repeat scroll 0% 0%; -moz-background-clip: -moz-initial; -moz-background-origin: -moz-initial; -moz-background-inline-policy: -moz-initial; color: #323232; padding-left: 15px; padding-top: 10px; padding-bottom: 10px;\">\n<p><span style=\"font-family: arial, helvetica, sans-serif; font-size: 20px; color: #000000; line-height: 1.3;\">O SAD69 \u00e9 um sistema geod\u00e9sico regional de concep\u00e7\u00e3o cl\u00e1ssica. A sua utiliza\u00e7\u00e3o pelos pa\u00edses Sul-americanos foi recomendada em 1969 atrav\u00e9s da aprova\u00e7\u00e3o do relat\u00f3rio final do Grupo de Trabalho sobre o Datum Sul-americano, pelo Comit\u00ea de Geod\u00e9sia reunido na XI Reuni\u00e3o Panamericana de Consulta sobre Cartografia, recomenda\u00e7\u00e3o n\u00e3o seguida pela totalidade dos pa\u00edses do continente. Apenas em 1979 ele foi oficialmente adotado como sistema de refer\u00eancia para trabalhos geod\u00e9sicos e cartogr\u00e1ficos desenvolvidos em territ\u00f3rio brasileiro.<\/span><\/p>\n<\/blockquote>\n<p><span style=\"font-size: 20px; font-family: arial, helvetica, sans-serif; color: #000000;\"><strong>Fonte<\/strong>: ftp:\/\/geoftp.ibge.gov.br\/informacoes_sobre_posicionamento_geodesico\/sirgas\/sisref_2.pdf<\/span><\/p>\n<p><span style=\"color: #000000; font-size: 20px; font-family: arial, helvetica, sans-serif; line-height: 1.3;\">Par\u00e2metros do SAD 69:<\/span><\/p>\n<ul>\n<li><span style=\"font-size: 20px; font-family: arial, helvetica, sans-serif; color: #000000; line-height: 1.3;\">Elipsoide &#8211; Elipsoide do sistema geod\u00e9sico de refer\u00eancia GRS-67, aceito e recomendado pela UGGI, em Lucerna, no ano de 1967.<\/span><\/li>\n<li><span style=\"font-size: 20px; font-family: arial, helvetica, sans-serif; color: #000000; line-height: 1.3;\">Ponto de amarra\u00e7\u00e3o &#8211; V\u00e9rtice chu\u00e1.<\/span><\/li>\n<li><span style=\"font-size: 20px; font-family: arial, helvetica, sans-serif; color: #000000; line-height: 1.3;\">Orienta\u00e7\u00e3o &#8211; <a href=\"https:\/\/adenilsongiovanini.com.br\/blog\/azimute-o-que-e-e-para-que-serve\/\"><span style=\"color: #0000ff;\">Azimute geod\u00e9sico<\/span><\/a> da dire\u00e7\u00e3o inicial Chu\u00e1-Uberaba (\u03be=0.31 \u03b7=-3.52 N=0 m).<\/span><\/li>\n<li><span style=\"font-size: 20px; font-family: arial, helvetica, sans-serif; color: #000000; line-height: 1.3;\">Origem: topoc\u00eantrico.<\/span>\n<\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n<h3 style=\"text-align: center;\"><span style=\"font-size: 20px; font-family: arial, helvetica, sans-serif; color: #000000; line-height: 1.3;\"><strong>Sistemas geod\u00e9sicos de refer\u00eancia &#8211; SIRGAS 2000<\/strong><\/span><\/h3>\n<p><span style=\"font-size: 20px;\"><img decoding=\"async\" class=\"aligncenter size-large wp-image-4926\" src=\"http:\/\/adenilsongiovanini.com.br\/blog\/wp-content\/uploads\/2019\/12\/Sirgas2000C1-725x1024.jpg\" alt=\"sistemas geod\u00e9sicos de refer\u00eancia - Sirgas 2000\" width=\"725\" height=\"1024\" \/><\/span><\/p>\n<p><span style=\"font-size: 20px; font-family: arial, helvetica, sans-serif; color: #000000;\"> O <span style=\"color: #0000ff;\"><a style=\"color: #0000ff;\" href=\"https:\/\/adenilsongiovanini.com.br\/blog\/sirgas-2000\/\">SIRGAS2000<\/a><\/span> (sistema de refer\u00eancia geoc\u00eantrico para as Am\u00e9ricas) foi definido pelo IBGE como o <strong>Sistema Geod\u00e9sico Brasileiro<\/strong>.<\/span><\/p>\n<p><span style=\"font-size: 20px; font-family: arial, helvetica, sans-serif; color: #000000; line-height: 1.3;\">O mesmo foi criado em outubro de 1993, e possui como principal objetivo, estabelecer um sistema de refer\u00eancia geoc\u00eantrico para a Am\u00e9rica do Sul. <\/span><\/p>\n<p><span style=\"font-size: 20px;\"><span style=\"font-family: arial, helvetica, sans-serif; color: #000000; line-height: 1.3;\">As constantes do mesmo s\u00e3o id\u00eanticas \u00e0s do WGS 84, sendo que o mesmo possui origem g<\/span><span style=\"font-family: arial, helvetica, sans-serif; color: #000000;\">eoc\u00eantrica.<\/span><\/span><\/p>\n<p><span style=\"font-size: 20px; font-family: arial, helvetica, sans-serif; color: #000000; line-height: 1.3;\">Na imagem abaixo voc\u00ea pode ver os par\u00e2metros de transforma\u00e7\u00e3o entre os diferentes sistemas de refer\u00eancia:<\/span><\/p>\n<p><span style=\"font-size: 20px;\"><img decoding=\"async\" class=\"aligncenter wp-image-3670 size-large\" src=\"https:\/\/adenilsongiovanini.com.br\/blog\/wp-content\/uploads\/2019\/11\/Par\u00e2metros-de-transforma\u00e7\u00e3o-entre-os-diferentes-data-780x417.png\" alt=\"Par\u00e2metros de transforma\u00e7\u00e3o de um sistema geod\u00e9sico de refer\u00eancia\" width=\"780\" height=\"417\" srcset=\"https:\/\/adenilsongiovanini.com.br\/blog\/wp-content\/uploads\/2019\/11\/Par\u00e2metros-de-transforma\u00e7\u00e3o-entre-os-diferentes-data-780x417.png 780w, https:\/\/adenilsongiovanini.com.br\/blog\/wp-content\/uploads\/2019\/11\/Par\u00e2metros-de-transforma\u00e7\u00e3o-entre-os-diferentes-data-300x161.png 300w, https:\/\/adenilsongiovanini.com.br\/blog\/wp-content\/uploads\/2019\/11\/Par\u00e2metros-de-transforma\u00e7\u00e3o-entre-os-diferentes-data-768x411.png 768w, https:\/\/adenilsongiovanini.com.br\/blog\/wp-content\/uploads\/2019\/11\/Par\u00e2metros-de-transforma\u00e7\u00e3o-entre-os-diferentes-data.png 1168w\" sizes=\"(max-width: 780px) 100vw, 780px\" \/><\/span><\/p>\n<p>&nbsp;<\/p>\n<p>&nbsp;<\/p>\n<h2 style=\"text-align: center;\"><span style=\"font-size: 24px;\"><strong><span style=\"font-family: arial, helvetica, sans-serif; color: #000000;\">Materializa\u00e7\u00e3o de um sistema geod\u00e9sico de refer\u00eancia<\/span><\/strong><\/span><\/h2>\n<p><span style=\"font-size: 20px;\"><img decoding=\"async\" class=\"aligncenter wp-image-4924 size-large\" src=\"https:\/\/adenilsongiovanini.com.br\/blog\/wp-content\/uploads\/2019\/12\/IBGE-SIRGAS-2000-728x780.png\" alt=\"IBGE SIRGAS 2000\" width=\"728\" height=\"780\" srcset=\"https:\/\/adenilsongiovanini.com.br\/blog\/wp-content\/uploads\/2019\/12\/IBGE-SIRGAS-2000-728x780.png 728w, https:\/\/adenilsongiovanini.com.br\/blog\/wp-content\/uploads\/2019\/12\/IBGE-SIRGAS-2000-280x300.png 280w, https:\/\/adenilsongiovanini.com.br\/blog\/wp-content\/uploads\/2019\/12\/IBGE-SIRGAS-2000-768x823.png 768w, https:\/\/adenilsongiovanini.com.br\/blog\/wp-content\/uploads\/2019\/12\/IBGE-SIRGAS-2000.png 793w\" sizes=\"(max-width: 728px) 100vw, 728px\" \/><\/span><\/p>\n<p><span style=\"font-size: 20px; font-family: arial, helvetica, sans-serif; color: #000000; line-height: 1.3;\">A <strong>materializa\u00e7\u00e3o de um sistema geod\u00e9sico de refer\u00eancia<\/strong> se d\u00e1 atrav\u00e9s do estabelecimento de uma rede de <span style=\"color: #0000ff;\"><a style=\"color: #0000ff;\" href=\"https:\/\/www.ibge.gov.br\/geociencias\/informacoes-sobre-posicionamento-geodesico\/rede-geodesica.html\">esta\u00e7\u00f5es geod\u00e9sicas<\/a><\/span> implantadas e pelo IBGE.<\/span><\/p>\n<p><span style=\"font-size: 20px; font-family: arial, helvetica, sans-serif; color: #000000; line-height: 1.3;\">Estas esta\u00e7\u00f5es possuem com <strong>coordenadas tridimensionais<\/strong> estabelecidas atrav\u00e9s de t\u00e9cnicas de posicionamento espacial de alta precis\u00e3o.<\/span><\/p>\n<p><span style=\"font-size: 20px; font-family: arial, helvetica, sans-serif; color: #000000; line-height: 1.3;\">Utilizando-se do <span style=\"color: #0000ff;\"><a style=\"color: #0000ff;\" href=\"https:\/\/adenilsongiovanini.com.br\/blog\/posicionamento-pelo-gnss-georreferenciamento\/\">posicionamento pelo GNSS<\/a><\/span>, o IBGE implantou uma s\u00e9rie destas esta\u00e7\u00f5es estrategicamente distribu\u00eddas ao longo do territ\u00f3rio nacional.<\/span><\/p>\n<p><span style=\"font-size: 20px; font-family: arial, helvetica, sans-serif; color: #000000; line-height: 1.3;\">Esta\u00e7\u00f5es estas que fazem parte da <span style=\"color: #0000ff;\"><a style=\"color: #0000ff;\" href=\"https:\/\/www.ibge.gov.br\/geociencias\/informacoes-sobre-posicionamento-geodesico\/rede-geodesica.html\">rede altim\u00e9trica e da rede planialtim\u00e9trica<\/a><\/span>.<\/span><\/p>\n<p><span style=\"font-size: 20px; font-family: arial, helvetica, sans-serif; color: #000000; line-height: 1.3;\">Veja na imagem abaixo um exemplo de marco implantado pelo IBGE.<\/span><\/p>\n<p><span style=\"font-size: 20px;\"><img decoding=\"async\" class=\"aligncenter wp-image-3672\" src=\"http:\/\/adenilsongiovanini.com.br\/blog\/wp-content\/uploads\/2019\/11\/Marco-geod\u00e9sico.jpg\" alt=\"Marco geod\u00e9sico\" width=\"760\" height=\"653\" srcset=\"https:\/\/adenilsongiovanini.com.br\/blog\/wp-content\/uploads\/2019\/11\/Marco-geod\u00e9sico.jpg 768w, https:\/\/adenilsongiovanini.com.br\/blog\/wp-content\/uploads\/2019\/11\/Marco-geod\u00e9sico-300x258.jpg 300w\" sizes=\"(max-width: 760px) 100vw, 760px\" \/><\/span><\/p>\n<p><span style=\"font-size: 20px; font-family: arial, helvetica, sans-serif; color: #000000; line-height: 1.3;\">\u00c9 isso por este artigo. <\/span><span style=\"font-size: 20px; font-family: arial, helvetica, sans-serif; color: #000000; line-height: 1.3;\">Lembrando que eu tamb\u00e9m possuo uma s\u00e9rie de <strong>cursos pr\u00e1ticos e de livros<\/strong>. <\/span><\/p>\n<p><span style=\"font-size: 20px; font-family: arial, helvetica, sans-serif; color: #000000; line-height: 1.3;\">Se voc\u00ea quer<strong> MERGULHAR FUNDO e aprender a prestar servi\u00e7os com grande velocidade e com seguran\u00e7a<\/strong>, <span style=\"color: #0000ff;\"><a style=\"color: #0000ff;\" href=\"https:\/\/adenilsongiovanini.com.br\/cursos-online\/\">acesse este link<\/a><\/span> e conhe\u00e7a os mesmos.<\/span><\/p>\n<p><span style=\"color: #000000;\"><span style=\"font-size: 20px; font-family: arial, helvetica, sans-serif; line-height: 1.3;\">Entre eles, o <span style=\"color: #0000ff;\"><a style=\"color: #0000ff;\" href=\"https:\/\/adenilsongiovanini.com.br\/curso-de-autocad-para-topografia\/\" target=\"_blank\" rel=\"noopener noreferrer\">Curso de Confec\u00e7\u00e3o de Plantas Topogr\u00e1ficas<\/a><\/span>. <span style=\"color: #000000;\">Um <\/span><\/span><span style=\"font-size: 20px; font-family: arial, helvetica, sans-serif; line-height: 1.3;\">curso pr\u00e1tico <\/span><span style=\"font-size: 20px; font-family: arial, helvetica, sans-serif; line-height: 1.3;\">com o qual voc\u00ea vai <strong>aprender a produzir as 15 diferentes plantas produzidas em um escrit\u00f3rio de topografia<\/strong>.<\/span><\/span><\/p>\n<p><a href=\"https:\/\/adenilsongiovanini.com.br\/curso-de-autocad-para-topografia\/\" target=\"_blank\" rel=\"noopener noreferrer\"><img decoding=\"async\" class=\"aligncenter wp-image-31689\" src=\"https:\/\/adenilsongiovanini.com.br\/wp-content\/uploads\/2022\/07\/planta-de-topografia-1024x612.png\" alt=\"\" width=\"770\" height=\"460\" \/><\/a> <span style=\"font-family: arial, helvetica, sans-serif; font-size: 20px; color: #000000;\">Clique <a href=\"https:\/\/adenilsongiovanini.com.br\/curso-de-autocad-para-topografia\/\" target=\"_blank\" rel=\"noopener noreferrer\"><span style=\"color: #0000ff;\">neste link<\/span><\/a> e conhe\u00e7a melhor o mesmo.<\/span><\/p>\n<p><span style=\"font-size: 20px; font-family: arial, helvetica, sans-serif; color: #000000; line-height: 1.3;\">Gratid\u00e3o por voc\u00ea ter lido o artigo. \ud83d\ude4f<\/span><\/p>\n<p>&nbsp;<\/p>\n<p>&nbsp;<\/p>\n<h2 style=\"text-align: center;\"><span style=\"font-family: arial, helvetica, sans-serif; color: #000000; font-size: 24px;\"><strong>Domine a Topografia Cadastral atrav\u00e9s de um livro formado por centenas de exemplos pr\u00e1ticos <\/strong><\/span><\/h2>\n<h2 style=\"text-align: center;\"><span style=\"font-size: 20px;\"><a href=\"https:\/\/adenilsongiovanini.com.br\/georreferenciamento-de-imoveis-rurais-na-pratica\/\" rel=\"nofollow noreferrer\"><img decoding=\"async\" class=\"aligncenter size-large wp-image-19317\" src=\"https:\/\/adenilsongiovanini.com.br\/blog\/wp-content\/uploads\/2021\/04\/livro-de-topografia-e-georreferenciamento-1024x474.png\" sizes=\"(max-width: 1024px) 100vw, 1024px\" srcset=\"https:\/\/adenilsongiovanini.com.br\/blog\/wp-content\/uploads\/2021\/04\/livro-de-topografia-e-georreferenciamento-1024x474.png 1024w, https:\/\/adenilsongiovanini.com.br\/blog\/wp-content\/uploads\/2021\/04\/livro-de-topografia-e-georreferenciamento-300x139.png 300w, https:\/\/adenilsongiovanini.com.br\/blog\/wp-content\/uploads\/2021\/04\/livro-de-topografia-e-georreferenciamento-768x355.png 768w, https:\/\/adenilsongiovanini.com.br\/blog\/wp-content\/uploads\/2021\/04\/livro-de-topografia-e-georreferenciamento-1536x711.png 1536w, https:\/\/adenilsongiovanini.com.br\/blog\/wp-content\/uploads\/2021\/04\/livro-de-topografia-e-georreferenciamento-320x148.png 320w, https:\/\/adenilsongiovanini.com.br\/blog\/wp-content\/uploads\/2021\/04\/livro-de-topografia-e-georreferenciamento-640x296.png 640w, https:\/\/adenilsongiovanini.com.br\/blog\/wp-content\/uploads\/2021\/04\/livro-de-topografia-e-georreferenciamento-360x167.png 360w, https:\/\/adenilsongiovanini.com.br\/blog\/wp-content\/uploads\/2021\/04\/livro-de-topografia-e-georreferenciamento-720x333.png 720w, https:\/\/adenilsongiovanini.com.br\/blog\/wp-content\/uploads\/2021\/04\/livro-de-topografia-e-georreferenciamento-1080x500.png 1080w, https:\/\/adenilsongiovanini.com.br\/blog\/wp-content\/uploads\/2021\/04\/livro-de-topografia-e-georreferenciamento-800x370.png 800w, https:\/\/adenilsongiovanini.com.br\/blog\/wp-content\/uploads\/2021\/04\/livro-de-topografia-e-georreferenciamento-1280x592.png 1280w, https:\/\/adenilsongiovanini.com.br\/blog\/wp-content\/uploads\/2021\/04\/livro-de-topografia-e-georreferenciamento.png 1565w\" alt=\"livro de topografia e georreferenciamento\" width=\"1024\" height=\"474\" \/><\/a><\/span><\/h2>\n<p><span style=\"font-family: arial, helvetica, sans-serif; font-size: 20px; color: #000000;\">Voc\u00ea quer dominar a Topografia Cadastral?<\/span><\/p>\n<p><span style=\"font-family: arial, helvetica, sans-serif; font-size: 20px; color: #000000;\">Ent\u00e3o eu tenho uma \u00f3tima noticia para voc\u00ea. Me refiro ao <span style=\"color: #0000ff;\"><a style=\"color: #0000ff;\" href=\"https:\/\/adenilsongiovanini.com.br\/georreferenciamento-de-imoveis-rurais-na-pratica\/\" rel=\"nofollow noreferrer\">livro Topografia Cadastral e Georreferenciamento de Im\u00f3veis Rurais na Pr\u00e1tica<\/a><\/span>.<\/span><\/p>\n<p><span style=\"font-size: 20px;\"><span style=\"font-family: arial, helvetica, sans-serif; color: #000000;\">O mesmo \u00e9 dividido em 10 cap\u00edtulos recheados com muitos estudos de caso e exemplos pr\u00e1ticos. D\u00ea uma espiadinha no sum\u00e1rio do mesmo:<\/span><\/span><\/p>\n<p>&nbsp;<\/p>\n<p><center><iframe width=\"99%\" height=\"980\" src=\"https:\/\/drive.google.com\/file\/d\/1HJ8fZz1PvPmftfXHJNFTvIBBzY_FZhPJ\/preview\"><span data-mce-type=\"bookmark\" style=\"display: inline-block; width: 0px; overflow: hidden; line-height: 0;\" class=\"mce_SELRES_start\">\ufeff<\/span><\/iframe><\/center><\/p>\n<p>&nbsp;<\/p>\n<p><span style=\"font-size: 20px;\"><span style=\"font-family: arial, helvetica, sans-serif; color: #000000;\">Para conhecer melhor a estrutura do livro, juntar-se a mais de 800 profissionais e adquirir sua c\u00f3pia \u00e9 s\u00f3 clicar no bot\u00e3o abaixo:<\/span><\/span><\/p>\n<p>&nbsp;<\/p>\n<p><span style=\"color: #000000; font-size: 20px;\"><div class=\"su-button-center\"><a href=\"https:\/\/adenilsongiovanini.com.br\/georreferenciamento-de-imoveis-rurais-na-pratica\/\" class=\"su-button su-button-style-3d\" style=\"color:#000000;background-color:#2BCC2F;border-color:#23a426;border-radius:9px\" target=\"_blank\" rel=\"nofollow\" id=\"1\"><span style=\"color:#000000;padding:0px 24px;font-size:18px;line-height:36px;border-color:#6bdc6e;border-radius:9px;text-shadow:0px 0px 0px #000000\"> \u279c Quero Conhecer Melhor o Livro, Pois Quero e Preciso Aprender Mais Sobre Legisla\u00e7\u00e3o Cadastral e Geo. de Im\u00f3veis Rurais<\/span><\/a><\/div><\/span><\/p>\n<p>&nbsp;<\/p>\n<p>&nbsp;<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Sistemas geod\u00e9sicos de refer\u00eancia, voc\u00ea acabou de encontrar um artigo definitivo a respeito do tema. Com a leitura do mesmo voc\u00ea aprender\u00e1: O que \u00e9 um sistemas geod\u00e9sicos de refer\u00eancia; Quais os par\u00e2metros de um sistema geod\u00e9sico de refer\u00eancia; Porque foi necess\u00e1ria a cria\u00e7\u00e3o de elipsoides; Sistema geod\u00e9sicos topoc\u00eantricos e [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":3674,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_monsterinsights_skip_tracking":false,"_monsterinsights_sitenote_active":false,"_monsterinsights_sitenote_note":"","_monsterinsights_sitenote_category":0,"footnotes":""},"categories":[13,53],"tags":[],"class_list":["post-26645","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-arcgis","category-cartografia"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v26.5 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Sistemas Geod\u00e9sicos de Refer\u00eancia? - Adenilson Giovanini<\/title>\n<meta name=\"description\" content=\"O que \u00e9 um sistemas geod\u00e9sicos de refer\u00eancia, quais os par\u00e2metros do mesmo, quais os existentes e como \u00e9 feita a materializa\u00e7\u00e3o. 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