This is really interesting -- it looks like the grid coverage is heavily concentrated over English speaking parts of the world. Is this reflective of lack of grids used elsewhere, or that there's a disconnect in the community? 
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I just found a site that references tons of geoid models, including in South America, Africa, Asia, etc. : http://www.isgeoid.polimi.it/Geoid/reg_list.html … ! Most of them are not registered in EPSG.
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why no grids for south america? :(
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We have a contact with http://ibge.gov.br to clear licensing of Brazilian grids. Otherwise I'm not aware of grids for other S.A. countries
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Čini se da učitavanje traje već neko vrijeme.
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