Specifies the identification variables in the map data set whose
polygons will be checked against the points from the input data set.
| Requirements: |
At least one id-variable is required.
|
- id-variable(s)
-
specifies one or more identification variables from the
map data set. For each X and Y point in the input data set and each ID variable
that you specify, if the point lies within a polygon in the map data set,
then the ID value of that polygon is written to the output data set. If the
point lies outside of all of the polygons, then a missing value is written
to the output data set.
For example, the first observation in an input data set contains the
values X=1.37 and Y=.68.
In the PROC GINSIDE statement, you specify the MAPS.COUNTIES data set, and
in the ID statement you specify the STATE variable. The point (1.37,.68) lies
within the polygon where STATE=54, so the first value for STATE in the output
data set is 54.
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