Version mkgmap-r4175 was committed by gerd on Sun, 22 Apr 2018 poi_area-v2.patch : set special tag mkgmap:cache_area_size in generated POI for polygons and mulltipolygons possible usage: mkgmap:area2poi=true & mkgmap:cache_area_size > 1000 {do something ...} Also changes the result of the area_size() style function to round the value to 1/1000 map units. http://www.mkgmap.org.uk/websvn/revision.php?repname=mkgmap&rev=4175