New answers tagged heat-map
then I input a shape file from the folder that consists all the shapeless that need to be merged That's a bit hard to understand but I think your problem is that you are selecting only one file to merge while you should select the folder: Don't activate Select by layers in the folder if you want to merge all files in a folder anyway!
8.9 is the 98th percentile which QGIS computes by default for the rendering. If you change to min/max and press Load, QGIS computes 21.9, just like Arc.
I finally figured it out! The main problem for me was OUTPUT_EXTENT and RADIUS. Kernel density estimation takes radius in degress only and OUTPUT_EXTENT is the size of the output rater layer and takes input as a string of "xmin,xmax,ymin,ymax". ALGORITHM: Kernel density estimation POINTS <ParameterVector> Takes a vector layer(can be a local path) ...
I think you need to replace your radius parameter with a number. Incase this might help for future reference, what I usually do when I need to know what parameters I have to set, is to check the "help" details of the algorithm within Python Console (Plugins > Python Console). Type the first 2 lines below: >>>import processing ...
If you only want to visualize the density, I recommend using the new Heatmap renderer as shown in the following screenshot:
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