We have some 100+ georeferenced raster's in ecw format. All the rasters are in EPSG:20935 (Arc 1950/UTM 35S) reference system. We have captured the data_footprint of those rasters in the same CRS. But, if the scale level is say 60,000 or 40,000 QGIS is showing a shift between the data_footprint polygon and the respective raster. Once i change the scale to 20,000 or 10,000 the polygon and the raster boundary matches perfectly. Could anyone explain why this happens ?

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  • Have you set vertex points exactly at the cormers? – AndreJ Aug 18 '16 at 11:46
  • Yes. Took vertex points exactly at all the four corners of the grid – joseph_k Aug 19 '16 at 6:58
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    Does the issue persist if you save the raster as geotiff, and alternatively both shape and raster in WGS84 UTM 35S? – AndreJ Aug 19 '16 at 7:22
  • Tried that. But still there is a shift in images wherever a tif & ecw's are adjacent to one another. geonet.esri.com/thread/111188 In this case, since all the files are ecw's i guess the shift is uniform. – joseph_k Sep 8 '16 at 1:11

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