[gdal-dev] Error on gdal raster info in VRT - PROJ: No GeoPixelScale tag in overviews

[Michael Smith]

Hmm, that helped a lot. Looks like its tied to our having the Und_min1x1_egm2008_isw=82_WGS84_TideFree file in the PROJ_DATA location. Removing that and the issue goes away.

Mike


-- 

Michael Smith 
RSGIS Center – ERDC CRREL NH 
US Army Corps 





On 2/19/26, 3:07 PM, "Even Rouault" <even.rouault at spatialys.com <mailto:even.rouault at spatialys.com>> wrote:


Mike,


this error comes from PROJ when trying to use a grid that would lack 
this GeoPixelScale GeoTIFF tag. Is your EGM2008 grid OK ?


Even


Le 19/02/2026 à 20:15, Michael Smith via gdal-dev a écrit :
> GDAL 3.12.2 "Chicoutimi", released 2026/02/03 - from Conda-forge (both Linux and OSX)
>
> I have a base file (COG with overviews) that when I wrap in a VRT to reproject, I get an odd error but only on Linux, not on OSX (haven’t tested on windows):
>
> Specifically, I see:
>
> Center ( 42.4860100, 15.2722355) ( 42d29' 9.64"E, 15d16'20.05"N)
> Band 1 Block=512x128 Type=Float32, ColorInterp=Gray
> NoData Value=-32767
> GDAL: GDALOverviewDataset(raster21058922_EPSG:32638+3855.vrt, this=0x56307ab73b40) creation.
> ERROR 1: PROJ: No GeoPixelScale tag
> GDAL: GDALOverviewDataset(raster21058922_EPSG:32638+3855.vrt, this=0x56307ac1acc0) creation.
> ERROR 1: PROJ: No GeoPixelScale tag
> GDAL: GDALOverviewDataset(raster21058922_EPSG:32638+3855.vrt, this=0x56307aeaf410) creation.
> ERROR 1: PROJ: No GeoPixelScale tag
> GDAL: GDALOverviewDataset(raster21058922_EPSG:32638+3855.vrt, this=0x56307af40750) creation.
> ERROR 1: PROJ: No GeoPixelScale tag
> GDAL: GDALOverviewDataset(raster21058922_EPSG:32638+3855.vrt, this=0x56307afc7300) creation.
> ERROR 1: PROJ: No GeoPixelScale tag
> Overviews: 5130x4980, 2565x2490, 1283x1245, 641x623, 320x311
> GDAL: GDALClose(raster21058922_EPSG:32638+3855.vrt, this=0x56307a786b70)
> GDAL: GDALClose(raster26-21058922_EPSG:32638+3855.vrt, this=0x56307a740e50)
>
>
> The vrt that doesn't have reprojection doesn't get this. The base projection here is UTM+EGM2008.
>
> I have not seen this error before.
>
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