Hi all, I 've created an Intersection layer with two shapefile layers (polygons). I now want to update the new database (DBF) and feed 4 new fields, say IN_AREA, IN_PERIM, IN_X and IN_Y : 1) I wish I could specify the units. How could I? 2) The length button (Operators / 1.7.3) remains greyed-out though $perimeter as Field calculator expression seems to work. 3) $x and $y return NULL's : how do I extract X's and Y's of centroïds and feed IN_X and IN_Y? Using 1.7.3 and 1.8 on Windows 7x64. Thanks in advance for your help. Regards. Philippe de FRANCLIEU
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