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Not all line strings from same coordinates rendered in OpenLayers

Problem is in this part of your line creating functions: function generate_flowline(points: number[][]){ let array = points array.forEach((element, index) => { array[index] = olProj....
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Merge several polygons into one polygon in QGIS

The key processing algorithm here is Buffer. In the following steps, we'll have : a polygon layer : my_polygons a gap between polygons mesuring : 10 meters Open the processing toolbox (Ctrl + Alt + ...
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