| discretizePolygon {atakrig} | R Documentation |
Discretize spatial polygons to points.
Description
Discretize spatial polygons to points.
Usage
discretizePolygon(x, cellsize, id=NULL, value=NULL, showProgressBar=FALSE)
Arguments
x |
a SpatialPolygonsDataFrame object. |
cellsize |
cell size of discretized grid. |
id |
unique polygon id. if not given, polygons will be numbered from 1 to n accroding the record order. |
value |
polygon value. if not given, NA value will be assigned. |
showProgressBar |
whether show progress. |
Value
a discreteArea object: list(areaValues, discretePoints).
areaValues |
values of areas: data.frame(areaId,centx,centy,value), where areaId is polygon id; centx, centy are centroids of polygons. |
discretePoints |
discretized points of areas: data.frame(areaId,ptx,pty,weight), where ptx, pty are discretized points; by default, weight is equal for all points. |
Note
Point weight is normalized for each polygon. Weight need not to be the same for all points of a polygon. They can be assigned according to specific variables, such as population distribution.