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I reprojected a natural earth raster file (Natural Earth II with Shaded Relief, Water, and Drainages, CRS WGS84) with a costum CRS (azimuthal orthografic) using Raster->Projections->Warp in QGIS. Worked fine except glitches at the international date line and at the horizon of the hemisphere (see attached image). An idea how I can prevent these?

Edit: as @user30184 suggests adding -wo SAMPLE_STEPS=100 and -wo SOURCE_EXTRA=10 fixes the glitches

enter image description here

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    Try warping options -wo SAMPLE_STEPS=100 and perhaps -wo SOURCE_EXTRA=10 gdal.org/structGDALWarpOptions.html
    – user30184
    Commented Nov 24, 2016 at 13:48
  • @user30184 - Please post your comment as an answer :)
    – Joseph
    Commented Nov 24, 2016 at 15:00

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adding -wo SAMPLE_STEPS=100 and -wo SOURCE_EXTRA=10 fixes the glitches, thanks to @user30184

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