<div dir="ltr">While trying to add overviews to a raster we observe strange artifacts that did not exists in the original raster.<br><br>here is a link to the original raster:<div><a href="https://tellurictest.blob.core.windows.net/overviews-artifacts/one.tif?sp=r&st=2018-05-30T08:17:22Z&se=2019-06-08T16:17:22Z&spr=https&sv=2017-11-09&sig=L0WZrO7xYqacRVmXDSPGFLVe6tUYGlnwWh0huaI4%2Fng%3D&sr=b">https://tellurictest.blob.core.windows.net/overviews-artifacts/one.tif?sp=r&st=2018-05-30T08:17:22Z&se=2019-06-08T16:17:22Z&spr=https&sv=2017-11-09&sig=L0WZrO7xYqacRVmXDSPGFLVe6tUYGlnwWh0huaI4%2Fng%3D&sr=b</a></div><div><br><br>to generate the overviews I used this:<div><br>cp one.tif over_one.tif</div><div><br><div>gdaladdo -r cubic over_one.tif 2 4 8 16 32 64<br></div></div><div><br></div><div>here you can see the raster with overviews:</div><div><a href="https://tellurictest.blob.core.windows.net/overviews-artifacts/over_one.tif?sp=r&st=2018-05-30T08:20:28Z&se=2019-06-08T16:20:28Z&spr=https&sv=2017-11-09&sig=%2FV2hXg8f0mPLKQyMDODZ3p81Qnkb9GvAF%2B1zgk%2BypKE%3D&sr=b">https://tellurictest.blob.core.windows.net/overviews-artifacts/over_one.tif?sp=r&st=2018-05-30T08:20:28Z&se=2019-06-08T16:20:28Z&spr=https&sv=2017-11-09&sig=%2FV2hXg8f0mPLKQyMDODZ3p81Qnkb9GvAF%2B1zgk%2BypKE%3D&sr=b</a><br></div><div><br></div><div>by looking at both rasters in low zoom levels you can observe the artifacts.</div><div><br></div><div>thanks,</div><div>Ariel </div><div><br></div></div></div>