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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