density per squre KM

[JohnMatsa]

Hi, I have a shp file with the location (lat, lon) of lightning spatial distribution, one event and it's lat-lon info. I want to produce a density map of lightning occurrence per square KM. I used density point function and I don't know how to transform the output in square KM. My map's unit is kilometer I should use 1 Km radius? I'm using ArcGis 9,3 I appreciate any answer.

[Anonymous User]

1. Add a field to the point shapefile and use the field calculator to give every point a value of 1 (call it value).

2. Next, use the point to raster tool using the "value" field as the value field for the raster. Be sure to use the "SUM" for the cell assignment type (this way you will have the correct amount of points representing each cell).

3.Then run focal statistics using the "SUM" statistic in a circular neighborhood of 1 kilometer.  This will produce a density map showing number of lightning strikes per square km.  I hope that helps!

Here is a quick test example I did with a similar situation.  I used 30 meter cells and a smaller neighborhood than 1 km.

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