I'm trying to generate a heatmap of vehicle-pedestrian collisions in Los Angeles using data taken from UC Berekely TIMS. TIMS provides an exhaustive database of traffic accidents involving injury in the state of California.
I have a subset of the data mapped out in QGIS, and I'm attempting to create a heatmap using the heatmap plugin. However, instead of getting a heatmap, I get a solid black heatmap file. Moreover, when I try to open the properties screen, QGIS simply alerts me, "Bad Allocation," and won't refuses to open the property screen. I am using the default settings, with a radius of 200m (though I also tried 50m).
I tried to do this in QGIS 2.0, but I still get the black box. Am I missing some critical information on how to use the heatmap plugin?