Hi list: (Maybe related with Rob Vech e-mail: strange results when calculating area and perimeter )
I'm was trying calculate area of a layer with two polygons, but I can't get right values. Layer and project are in UTM 17s (epsg 32717) projection. I want square kilometers, so the used expression is: $area/100000 Field type is real, 10 digits, 2 decimals (also tryed with 15 digits) buth result is wrong for one polygon and zero for second. The layer has not geometric errors (I've check it), and can be download from https://sites.google.com/site/ccerdan/Home/Cuencas_Cajamarca.zip?attredirects=0&d=1 There are a field "Area_KM2" that was calculated in ArcGIS and it has the right values. The "Area_Ha" has the (wrong) result of QGIS field calculator. What is wrong with field calculator? UPDATE: After a reboot, field calculator found the right values... but What was wrong? Carlos
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