[Gdal-dev] how to know if GDALOpen(filename,GA_Update) is valid ?

[Frank Warmerdam]

Julien Demaria wrote:
> I understand that each driver as special meta-datas GDAL_DCAP_CREATE and 
> GDAL_DCAP_CREATECOPY if it support them ? and if a driver as a Create 
> method, it must support the GA_Update mode, isn't it ?

Julien,

For the most part formats with a Create() method also support update but there
are a number off formats that support imagery update that do no have
Create() methods.

Best regards,
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