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 Feb 11 awarded Nice Answer Feb 10 awarded Yearling Jan 2 comment Circle area calculation in QGIS is inaccurate Vince already gave you the answer, but I'm still intrigued by the result QGIS gave you. With 99 vertices and 3 km radius, the result should be `28255356.207 m2`. Could you check whether the distance from the circle center to one of the vertices is 3 km? Maybe the vertices are actually a little bit further out in order to get a better approximation. Jan 2 comment Circle area calculation in QGIS is inaccurate How did you create the circle, in particular how many vertices did you use to approximate the circle? Nov 29 awarded Nice Answer Nov 24 awarded Enlightened Nov 24 awarded Nice Answer Oct 21 awarded Enlightened Oct 21 awarded Nice Answer Sep 15 awarded Popular Question May 10 revised Can GRASS compute the line graph representation of an input graph? Fixed link (hopefully that's the intended target) Apr 26 comment How to overlay a Lat/Long CSV and NAD83 Shapefile in QGIS? In your Project Properties (Project | Project Properties | CRS), have you checked "Enable 'on the fly' CRS transformation"? Apr 15 comment GDAL merge; Why add 0.1? I believe this is done to avoid issues resulting from numerical inaccuracies: the `int` operator converts a floating point number to an integer by rounding down, so you might end up with a value for the offset that's off by one. For instance, the expression `int(1.0 / 100000001 * 100000001)` evaluates to `0`, not to `1` like the algebraic solution. By adding a small value you push the result of the division over the edge of the next integer value if you're already close to it. Another approach to avoid this problem is to use `int(round( ... ))`. Apr 14 comment QGIS - quickly style categorical map You don't need to set `Min` and `Max` manually: you can select "Min / max" in the "Load min/max of full extent" section and "Actual (slower)" in the "Accuracy" section, then click "Load". You do need to set the number of classes manually (it's `max - min + 1`). I'm not sure what you mean by "Plus that wouldn't account for missing values (e.g. 0, 2, 4, 5)?" Apr 14 comment QGIS - quickly style categorical map When you select "Singleband pseudocolor" for the render type, the second to last entry in the dropdown list in the "Generate new colormap" section is "Random colors". Is that what you're looking for? For loading the values into the value/color list, you can set "Equal interval" for the mode and then use the "Classify" button. Apr 13 revised What's the right way to calculate the scale parameter value for r.relief in GRASS? added 1018 characters in body Apr 13 answered What's the right way to calculate the scale parameter value for r.relief in GRASS? Mar 20 comment Simulate sun movement Hillshading won't help for this application, since it just takes the aspect of the local terrain into account, but doesn't simulate the casting of shadows from other terrain features. For instance, in the afternoon the west facing slope of a steep valley could be illuminated according to the hillshading algorithm, but in reality it would be shaded by the opposite hill. Mar 19 answered Unable to Produce Hillshade Mar 19 comment Unable to Produce Hillshade possible duplicate of Scale and Z factor have no effect on hillshade analysis in QGIS