Tuesday, 15 August 2017

Different results using $length (field calculator) in QGIS versions 2.18 and 3.0


I use the field calculator to measure the length of LineStrings in my shapefile layer, but i get different results when using QGIS 2.18 or QGIS 3.0.


If I am using the local coordinate system the difference between the QGIS 2.18 and QGIS 3.0 is not significant. If I am using WGS84 (I know you should always use the local coordinate system) I get two different results based on the version I am using. In 10 km the difference is almost 2 km..


Does anyone know what might be the reason? Did the algorithm behind the length calculations change in QGIS 3?





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