Even Rouault-2 wrote > Le vendredi 04 novembre 2016 18:00:10, Rahkonen Jukka (MML) a écrit : >> Hi, >> >> Once again someone wants to get the footprints of valid data in images >> http://gis.stackexchange.com/questions/216624/creating-a-shapefile-for-foo >> tprint-of-tasters-valid-data-areas-with-gdal. >> >> A year ago, in here >> https://lists.osgeo.org/pipermail/gdal-dev/2015-October/042859.html Even >> suggested to create a mask-only image with >> gdal_translate in.tif mask.tif -b mask >> and then polygonize that into vectors with gdal_polygonize. >> >> I wonder how hard it would be to make gdal_polygonize to find the mask >> band >> directly and recognize it with "-b mask" just like gdal_translate does. > > Not that hard. I just added support for that. > > Even
Thanks, and here is a little post-process command with SQLite SQL dialect that can be used for removing the no-data polygons and holes which are created by gdal_polygonize and leave just the yes-data area ogr2ogr -f GML -dialect SQLite -sql "select ST_BuildArea(ST_ExteriorRing(geometry)) from mask where DN=255" raster_data_polygon.gml mask.gml -Jukka Rahkonen- -- View this message in context: http://osgeo-org.1560.x6.nabble.com/gdal-dev-Make-gdal-polygonize-to-support-the-mask-band-tp5294371p5294630.html Sent from the GDAL - Dev mailing list archive at Nabble.com. _______________________________________________ gdal-dev mailing list [email protected] http://lists.osgeo.org/mailman/listinfo/gdal-dev
