When I change a vector layer to raster using raster button->converse->Vector rasterization in QGIS2.8. I get only a black picture.
Why is that so and how can I convert a vector layer to a raster layer.
[GIS] QGIS 2.8 Convert a vector to a raster layer
qgisqgis-2.8rastervector
Related Solutions
Install the GDAL plugin and then use the Clipper Tool.
Convert Vector to Raster wraps GDAL's gdal_rasterize, which until version 1.8.0, didn't create the output raster. So the cell size, projection, and so on are determined by the raster not the command line options.
It is something of a Catch-22 for sure because GDAL has no easy method of creating an empty image. You can try creating two one-pixel images for the top left and bottom right in a paint program, run gdal_translate on them to georeference them, then create a VRT from those, and finally use gdal_translate to convert from the VRT to a GeoTIFF or similar, but it is a pain for sure!
The better alternative would be to upgrade to GDAL >= 1.8.0 and use the new -tr and -te parameters of gdal_rasterize.
Best Answer
Rasterization depends of the field that you select. For example, in the following case I selected (in vector layer point_2) the 'field' field whose values are all 0. The result, point_2_raster.tif, is the same that you are obtaining (a black picture):
However, if the 'id' field is selected, whose values are between 1 and 5, the result (point_raster.tif) is totally different:
It could be your problem.