New answers tagged srtm
According to http://epsg.io/3857 , google & OSM use EPSG:3857. From memory, http://epsg.io/4326 is more an old standard.
If you convert from one CRS to another, you will change the cell borders automatically. gdalwarp tries to keep the cell value, but it will also try to interpolate if the new cell size will cover different unreprojected cells. Reducing the cell size with -tr or -ts might solve your problem (but increase the raster file size too).
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