I use the Point Sampling Tool in QGIS to transfer gridvalues (of DEMs) to point features. This goes well with grids from f.i. MapMart (SRTMHARRIS_DEM), but I get only NULL-values when using grids from USGS (SRTM 1 Arc-Second Global). Does anybody know why and how to get proper values from SRTM 1 Arc-Second Global?
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