[gdal-dev] Corner Coordinates for GeoTIFF/GeoPDF

[Cory Foy]

Hi Greg,

> You didn't say, but presumably the geopdf is in some projected
> coordinate system, and you are working in a projected coordinate system
> also.   Or perhaps the geopdf is projected but not really aligned to a
> particular CRS.  All things to understand.

Thank you!! This was the exact pointer I needed. Looking closer at the gdalinfo with your comment in context made me realize I was seeing the WGS84, but missing the line above it that says PROJCRS["Popular Visualisation CRS / Mercator”! That let me do this:

let spatialReference: OGRSpatialReferenceH? = nil
OSRSetFromUserInput(spatialReference, "EPSG:3857")
var env: OGREnvelope = OGREnvelope()
GDALGetExtent(self.dataset, &env, spatialReference)

Which got me much closer to what I needed. Thanks so much for everyone’s help - I think I’m on the right path now.

Cory

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