[gdal-dev] Encoding EPSG:3857 (WebMercator) in GeoTIFF, and ArcGIS interoperability

Pepijn Van Eeckhoudt pepijn at vaneeckhoudt.net
Thu Apr 16 06:27:49 PDT 2015


> Ranges:
>   [    1,   1000]  = Obsolete EPSG/POSC Projection System Codes
>   [20000,  32760]  = EPSG Projection System codes
>   32767            = user-defined
>   [32768,  65535]  = Private User Implementations
> 
> But there's a big hole for ]1000,20000[, and 3857 is in it. And even if it was 
> in the [2000,3276] range, it didn't exist at the time of the latest GeoTIFF 
> spec. Frank's "accepted industry practice" is to just make Projected CS Type 
> Code = EPSG PCS code.

Ok. I was looking for some rules that translate the [20000, 32760] range to EPSG codes.

>> OGC started a SWG to do this GeoTIFF spec refinement work. Might be
>> worthwhile to ask that group for input, although looking at their mailing
>> list, github repo and wiki pages there doesn’t seem to be much going on at
>> the moment (or at least there’s no record of it).
> 
> Yes, I've contacted one of the members.
> 
> I can't see a geotiff list at https://lists.opengeospatial.org/mailman/listinfo 
> . Is it a public one ?

The archives are private so you probably need to be an OGC member to access them. I’m not working at Luciad anymore so I can’t be of much help myself; I haven’t registered as an individual member. My old Luciad account is still active which gives me access to the archives, but I’m not sure how long that will remain the case.

Best regards,

Pepijn


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