I have a personal geodatabase file (.mdb file), I open it with QGIS Las Palmas on windows 7. It is displayed perfect, but when I open table attributes for polygons, shape_area and shape_length have an unit that I don't understand, 100% not in meter or km, my crs is WGS84. How to convert these units in the table to meters?!! in order to save it later as csv?
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You might need to reproject your data to a meter-based projected CRS to get results in that unit. Don't use EPSG:3857, it is not worth for any measurement. – AndreJ Apr 28 '18 at 13:17
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Here is one method:
- Right click layer and select save as option and change the output coordinate crs option to some local utm projected coordinate system and save to a new shapefile
- Load shapefile into Q and open up attribute table, start edit session, open field calculator, and run the
$area
expression on the new field in field calculator - This should provide you area values for each feature in meters. You may then right click on layer again in the and select save as and save to csv.