I am trying to summarize my polygons by each's distribution of some variable.
To couch the discussion, let's say we wanted to summarize the demographics of each county (of a small state) by it's demographic makeup--say, black/white/other.
What came to mind would be to treat the fill of each county's polygon as a pie chart, and slice it accordingly.
Is there a way to do this in base QGIS (or SAGA)?
If not, what about through scripting? I was thinking one might be able to split the polygon layer into three new layers--white, black & other--with one slice of each polygon corresponding to the right wedge size.
This sounds vaguely doable to me, but I've got nothing like this GIS chops it would take. Any pointers?
Here's a rough sketch of what I've got in mind for two counties (with made up data).
The give-up alternative is to use the pie charts labeling feature. Which may be more readable in the end anyway... just wondering whether this is possible anyway.
Note that the areas of the resulting sub-polygons should correspond (in proportion to the overall area) to the data points--i.e., the B sub-polygon in Providence should be 10% of the Providence's area, and the B sub-polygon in Kent should be 50% of Kent's area.