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Vanessa Cecília Benavides Silva
vancecilia.geo@gmail.com
GEORREFERENCIAR IMAGEM SEM GRID NO ARCGIS
Muitas vezes precisamos trabalhar com uma imagem, ou mapa, que não estão georreferenciados e
não apresentam a grade de coordenadas para servir como referência para o procedimento de
georreferenciamento. Quando isso acontece, existem algumas possibilidades para solucionar esse problema.
Uma delas é ter um shapefile da área da imagem, ou alguma outra base, georreferenciado para servir como
referência.
No exemplo a seguir, será utilizado o shapefile do Zoneamento do município de Belo Horizonte, que
mostra os quarteirões, para georreferenciar uma imagem do Google Earth correspondente a um trecho do
município.
Procedimentos:
 Inserir o shapefile de
referência e depois inserir a
imagem não georreferenciada
(lembrando que o shapefile
deve ser inserido primeiro para
que o Data Frame adquira o
mesmo sistema de
coordenadas);
Vanessa Cecília Benavides Silva
vancecilia.geo@gmail.com
 Habilitar a barra de ferramentas Georeferencing: View  Toolbars 
Georeferencing;
 Selecionar a imagem na Table Of Contents:
 Aproximar a imagem sem referência ao shapefile com referência:
Georeferencing  Fit to Display:
 Dar zoom para aproximar uma área conhecida, ou algum ponto de referência que se tenha/saiba
(esquina, rio, rua, casa, ponto...), e repetir o procedimento de Georeferencing  Fit to Display:
 Para começar o procedimento de georreferenciamento, aproximar ao máximo os pontos da imagem
com o shapefile, clicar na opção Add Control Points da barra de ferramentas Georreferencing,
Vanessa Cecília Benavides Silva
vancecilia.geo@gmail.com
dar clique em um ponto na imagem e arrastar o mouse até o mesmo ponto no shapefile e clicar.
Repetir o procedimento até se conseguir maiores aproximações, lembrando-se de sempre conferir o
erro residual na tabela em View link table .
 Salvar a imagem georreferenciada com o Update Georeferencing ou Rectify.
Resumindo:
Bom trabalho!

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Tutorial georreferenciar-imagens-sem-grid-arc gis

  • 1. Vanessa Cecília Benavides Silva vancecilia.geo@gmail.com GEORREFERENCIAR IMAGEM SEM GRID NO ARCGIS Muitas vezes precisamos trabalhar com uma imagem, ou mapa, que não estão georreferenciados e não apresentam a grade de coordenadas para servir como referência para o procedimento de georreferenciamento. Quando isso acontece, existem algumas possibilidades para solucionar esse problema. Uma delas é ter um shapefile da área da imagem, ou alguma outra base, georreferenciado para servir como referência. No exemplo a seguir, será utilizado o shapefile do Zoneamento do município de Belo Horizonte, que mostra os quarteirões, para georreferenciar uma imagem do Google Earth correspondente a um trecho do município. Procedimentos:  Inserir o shapefile de referência e depois inserir a imagem não georreferenciada (lembrando que o shapefile deve ser inserido primeiro para que o Data Frame adquira o mesmo sistema de coordenadas);
  • 2. Vanessa Cecília Benavides Silva vancecilia.geo@gmail.com  Habilitar a barra de ferramentas Georeferencing: View  Toolbars  Georeferencing;  Selecionar a imagem na Table Of Contents:  Aproximar a imagem sem referência ao shapefile com referência: Georeferencing  Fit to Display:  Dar zoom para aproximar uma área conhecida, ou algum ponto de referência que se tenha/saiba (esquina, rio, rua, casa, ponto...), e repetir o procedimento de Georeferencing  Fit to Display:  Para começar o procedimento de georreferenciamento, aproximar ao máximo os pontos da imagem com o shapefile, clicar na opção Add Control Points da barra de ferramentas Georreferencing,
  • 3. Vanessa Cecília Benavides Silva vancecilia.geo@gmail.com dar clique em um ponto na imagem e arrastar o mouse até o mesmo ponto no shapefile e clicar. Repetir o procedimento até se conseguir maiores aproximações, lembrando-se de sempre conferir o erro residual na tabela em View link table .  Salvar a imagem georreferenciada com o Update Georeferencing ou Rectify. Resumindo: Bom trabalho!