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ccrook / QGIS-Contour-Plugin

Contour plugin for QGIS - uses python matplotlib to generate contours of data on vector point data.
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Contouring irregular points misses points #19

Closed ccrook closed 7 years ago

ccrook commented 7 years ago

There appears to be an issue/feature in matplotlib triangulation which causes it to miss large numbers of points where then data are far from the origin. Example data set and matplotlib script attached. Attached image is using matplotlib version 1.5.1. Apparently not an issue in 1.3.1

Workaround for the contour plugin is to translate the data to the origin before contouring. Not sure when this will work and when not.

Reported in https://github.com/matplotlib/matplotlib/issues/8842

tricont.zip tricont