When I retrace a polygon using the measure area tool and get what I believe to be an accurate area measurement. However if I utilise the field calculator within the attribute table to calculate the area of all my polygons, I get a significantly different area measurement than the one above which I believe to be completely inaccurate.
What is the cause of this discrepancy?
Any ideas why the field calculator is throwing out the wrong figures ? I'm using a WGS84 projection - EPSG4326