Question 2 is now finished: https://github.com/geopaparazzi/Spatialite-Tasks-with-Sql-Scripts/wiki/Project-1811-gdal_question-02
Short version: gdal_rasterize -tr 0.475211759942328 0.475212956422887 -te 24800 20700 25800 21300 -ot Byte -init 192 -a_nodata 192 -burn 0 -burn 173 -burn 83 -sql "SELECT ST_Buffer(soldner_segment,2.5) FROM segments_berlin_1786" ../sources/berlin_segments_qgis.db segments_berlin_1786_green.tif and combine the images with - gdalbuildvrt and gdal_translate --- This was the first time I used gdal_rasterize and found the sample on the htlm-page misleading - there is no sample on creating a image that can be overlayed (i.e. create a new image) - the first sample, assumes one is directly overwriting another image -- when using that sample in creating an new image it will fail, since '.b' is not permitted in new images - there is no sample on how to influence the width of the of the created lines All of this is useful for someone trying this out for the first time. Mark
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