https://community.esri.com/t5/arcgis-pro-questions/is-there-a-statistics-cache-for-rasters/m-p/1546916#M89006 <P>We've got some COG Tif on a server online and add them as VRT to ArcGIS Pro using gdal functions. I don't have writing rights on that server via its url, only reading rights. Some of the there stored rasters don't have statistics. In that case I can add the rasters without statistics - in this case the metadata of the vrt never hold the statistics (as expected). However if I add the raster and let it calculate the statistics, the next&nbsp; time adding the same data to a *NEW* project, the statistics of the same raster somehow exist - even though the COG Tif on server has none and I don't have writing rights on the server. Thus I think the statistics are also stored in a cache. Does anyone know, whether the statiics are stored in a cache? if yes, where do I find that cache? if no, how else could this behaviour be explained?</P> Wed, 09 Oct 2024 11:40:36 GMT nadja 2024-10-09T11:40:36Z https://community.esri.com/t5/arcgis-pro-questions/is-there-a-statistics-cache-for-rasters/m-p/1546916#M89006 <P>We've got some COG Tif on a server online and add them as VRT to ArcGIS Pro using gdal functions. I don't have writing rights on that server via its url, only reading rights. Some of the there stored rasters don't have statistics. In that case I can add the rasters without statistics - in this case the metadata of the vrt never hold the statistics (as expected). However if I add the raster and let it calculate the statistics, the next&nbsp; time adding the same data to a *NEW* project, the statistics of the same raster somehow exist - even though the COG Tif on server has none and I don't have writing rights on the server. Thus I think the statistics are also stored in a cache. Does anyone know, whether the statiics are stored in a cache? if yes, where do I find that cache? if no, how else could this behaviour be explained?</P> Wed, 09 Oct 2024 11:40:36 GMT https://community.esri.com/t5/arcgis-pro-questions/is-there-a-statistics-cache-for-rasters/m-p/1546916#M89006 nadja 2024-10-09T11:40:36Z https://community.esri.com/t5/arcgis-pro-questions/is-there-a-statistics-cache-for-rasters/m-p/1547453#M89050 <P>GDAL can write an .aux.xml locally when accessing files from a location where the user does not have write permissions.&nbsp; This auxillary metadata contains the cached stats.</P><P>This location is controlled by an environment variable or GDAL config option "<A href="https://gdal.org/en/latest/user/configoptions.html#persistent-auxiliary-metadata-pam-options" target="_self">GDAL_PAM_PROXY_DIR</A>"</P><P data-unlink="true">I don't know if this actually is the way your statistics are being cached as ArcGIS may have it's own cache mechanism. Nor do I know if there's a default location in the ArcGIS environment . I can't check as I don't have ArcGIS access as I'm on leave from work currently.&nbsp;</P><P data-unlink="true">One way to check would be to see if ArcGIS sets a&nbsp; GDAL_PAM_PROXY_DIR&nbsp; env dir (or set the&nbsp;env var&nbsp; GDAL_PAM_PROXY_DIR yourself to a known directory before opening ArcGIS), then look for .aux.xml in there after calculating statistics.</P> Thu, 10 Oct 2024 01:44:55 GMT https://community.esri.com/t5/arcgis-pro-questions/is-there-a-statistics-cache-for-rasters/m-p/1547453#M89050 Luke_Pinner 2024-10-10T01:44:55Z https://community.esri.com/t5/arcgis-pro-questions/is-there-a-statistics-cache-for-rasters/m-p/1548615#M89155 <P>thanks Luke, I ended up using&nbsp;</P><LI-CODE lang="python">gdal.SetConfigOption('GDAL_PAM_ENABLED', 'NO') </LI-CODE><P>which stopped the aux.xml files from being created.&nbsp;</P> Tue, 15 Oct 2024 12:04:54 GMT https://community.esri.com/t5/arcgis-pro-questions/is-there-a-statistics-cache-for-rasters/m-p/1548615#M89155 nadja 2024-10-15T12:04:54Z