clipmaskingqgisraster
I've got an Error: Cutline feature without a geometry on QGIS 2.4.0 Chugiak.
I have 2 samples (A raster type and a vector type), they have the same coordinates (EPSG:4253 – Luzon 1911) Then I tried using Clip on my Raster type,
Raster > Extraction > Clipper
Then I masked my vector to my raster, and got that error, Any Help would do. Or if you want I could send you my files.
After trying around with everything I finally figured out how to solve the problem. It had indeed to do with the CRS. Right click "Set CRS" was not enough here. I had to perform (on the raster) Raster->Projections->Warp, then set the desired CRS again and save as Geotiff.
The mask layer (vector layer) had to be saved again with the same CRS. After that the process worked.
Still weird, because I know, that in 1.7.4 it did work immediately. I can remember pretty well, because that was when I started with QGIS.
When you run the raster clip tool in QGIS, it shows you the exact GDAL command that will be run in the bottom section of the dialog box.
By clicking the pen button to the right of the command, you can edit it directly and add in a compression configuration option. In my example, this is the starting command:
gdalwarp -q -cutline /tmp/mask.shp -crop_to_cutline -of GTiff /tmp/453A.tif /tmp/output.tif
You can change this to be:
gdalwarp -q -cutline /tmp/mask.shp -crop_to_cutline -of GTiff -co "COMPRESS=LZW" /tmp/453A.tif /tmp/output.tif
The extra -co "COMPRESS=LZW" is just one of many possible compression options you can use with GeoTIFF files. The GDAL documentation has more information on all the options.
Best Answer
Similar problem right now (QGIS 2.6.1). But shapefile has some issues (topologic issues). I guess that shapefile has to be repaired before being used as crop mask.
Topological issues in shapefiles can be repaired using GRASS GIS. Here's a really simple guide of how to repair a bad polygon. You only need to know how to use GRASS GIS.
https://faunaliagis.wordpress.com/2013/08/14/bad-bad-polygon-fixing-invalid-geometries-with-quantum-gis/
This guide help me resolve my problem with a polygon shapefile with topological errors. Then, cropping was as easy as usual using QGIS tool and gdal warp tool.