Am 12.10.2014 22:43, schrieb Lukasz Tracewski:
Hi, I have a few thousands of ESRI ASCII rasters in World_Mollweide
(EPSG:54009) projection, which I need to convert to GeoTIFF. Usually
it goes fine, but there are certain special cases that resist
peaceful conversion. They are all placed on Fiji, which is special in
a sense being on very border of a world's map.
Thing is if I crop the ASCII in QGIS to include only left side of the
image, then it's fine. If I take the right side, then again I get
incorrect output.
Your dataset crosses the 180° meridian, that's why gdalwarp does not
like reprojecting to EPSG:4326.
What you can do:
- Reproject to a transverse mercator projection with 180° as central
meridian
- Clip your raster at 180° (or rather +/- 179.95°). Thats not very
difficult if you have done the tmerc reprojection.
- translate the data to XYZ format and import that as delimited text
point data. Reprojection of points is a lot easier.
HTH,
André Joost
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