I am working with a projected vector layer (EPSG:31287) that, after
dissolving polygons, has just two areas with no more than 20 vertices each.
The total area should be exactly one million square meters.
When I use the Add Geometry Attributes function, the sum of the
calculated areas is less than a square millimeter off. When I use instead
the $area variable in the field calculator, the sum is some 670 square
meters off.
What is the difference in the underlying algorithm of the two operations
involved?
Cheers,
Jochen
Dr. Jochen Albrecht, GISP (he/him/his)
Professor for Computational and Theoretical Geography
Department of Geography and Environmental Science
<http://www.geo.hunter.cuny.edu/>
Hunter College CUNY
695 Park Avenue
New York, NY 10065
Immediate Past-President, GIS Certification Institute
<https://www.gisci.org/>
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