In the QGIS function editor, it is possible to transform geometry using transform(geometry,'EPSG:xxx','EPSG:yyy') - however there isn't an area() function to recalculate the area of this.
The reason I am looking to do this is to have area calculated when a map is produced (labelled and as a virtual field in the attribute table); rather than store the area within the database as it is likely to change frequently as users modify the polygons?
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The reason I am looking to do this is to have area calculated when a map is produced (labelled and as a virtual field in the attribute table); rather than store the area within the database as it is likely to change frequently as users modify the polygons?
أكثر...