Population Density Calculation ArcView 3.x and Spatial Analyst
Download the "areagrid" of the world.
Open your ArcView 3.x.
Verify that the spatial analyst extension is on [Go to "File" then select "Extensions." Scroll down until you see the "Spatial Analyst" externsion and check the box to turn it on]. Close the Extension dialog box.
Open (or create) an ArcView project.
Load the population grid of interest.
Load the areagrid file as a grid.
Set the Analysis Properties to match the grid of interest (Figure A).
- Turn on the grid of interest in the table of contents. Click "Analysis" on the tool bar and select "Properties."
- Click on the "Analysis Extent" drop down button and select "Same as filename," (i.e., if you are using LandScan 2005 and the filename is Lspop2005, select "Same as Lspop2005."
- Select the drop down button next to "Analysis Cell Size" and select "As Specified Below."
- In the "Cell Size" data entry box, enter 0.00833333333333333
- Click "OK"
Next click on the "Analysis" tab and select "Map Calculator."
Enter the following formula (Figure B):
- ([Lspop2005] / [Areagrd.Area])
- Where Lspop2005 = the population grid file and
Areagrd.Area = the area grid file and the "Area" field name
Since the [Areagrd.Area] field is square kilometers, the resulting population density grid units are population per square kilometer.
Figure A: Analysis Extent and Cell Size Input
Figure B: Map Calculation Formula