Interpolating Count Data
In interpolating count data, the area of the target polygon is irrelevant, but the area of the source polygon is used in the calculation of the target value.
For count data, the value for each target polygon is estimated from the value of each intersecting source polygon multiplied by the area of intersection as a fraction of the area of the source polygon.
Vt = Σ Vs * Ats / As
Vt = value of the target polygon
Vs = value of the source polygon
Ats = area of the intersection of the target and source polygons
As = area of the source polygon
Consider the following coverages:
Assuming As Ats and Vs shown below, PARS calculates Vt as follows:
|Vs * Ats / As
Source: modified from Ballard and Schut, 1995
- Date Modified: