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(and I just notice now it was written in the 2010 question: "QGIS Heatmap plugin (available in versions > 1.7.x)", strict >)

Antonin
– Antonin

2012-03-23 14:59:52 +00:00
Commented Mar 23, 2012 at 14:59
I installed QGIS 1.9, and there is a heatmap pluging. I imported 186 points in my map (delimited text layer), and from these points I'm trying to create my heatmap with the plugin. Unfortunately, I only get a grey rectangle. I'm working on a space of order of magnitude of 0.005 degrees, with a buffer radius of 10 and a decay ratio of 0.5. Does anyone have an idea how I should use the plugin?

Antonin
– Antonin

2012-03-25 20:34:42 +00:00
Commented Mar 25, 2012 at 20:34
Hi Antonin. I'm not able to help you with the plugin itself since I can't use it with my Windows 1.7 version yet. But I'm questioning your spatial coordinates themselves. Heat maps (i.e., density maps) should be generated with points that have been projected, away from degrees (spherical coordinates). You'll want to have a regular, Cartesian surface (and probably end up with units in meters or km for your buffers and ratios). Can you project the data first to whatever might be a suitable projection for your AOI?

dianamaps
– dianamaps

2012-03-25 22:01:30 +00:00
Commented Mar 25, 2012 at 22:01

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