poly2allgrids

poly2allgrids(poly: polyDomain->*points, rasterDomain)

Results in

unit<uint32> _ { 
   attribute<polyDomain> polygon_rel;
   attribute<rasterDomain> grid_rel;
}

Description

This function results in a cross-table having for each polygon all raster-cell-centres that are inside that polygon, allowing for raster-cell-centres to be found in multiple (overlapping) polygons, unlike the result of poly2grid, which can only represent one polygon per raster-cell-centre.

Note that the attribute polygon_rel is only created when polyDomain is non-void.

Conditions

• poly must have value composition polygon, aka poly, or arc, i,e. must contain sequences of points.
• The rasterDomain must be related to the same geographic projection as the values unit of poly.
• This function will fail if the number of cross-table entries is larger than 2^32-2. If you are uncertain that this will not be the case, use poly2allgrids_uint64

See also

• #295
• poly2allgrids_uint64
• poly2grid