Thus, CCA is also applicable to self-intersecting polygons and polylines, and it enables local control.
Since s intersects all polygons from c up to the upper boundary or r (t), the removal of s decreases the cover-variables by one for all polygons above c, the two polygons adjacent to c have to join, and the maximal polygons above c have to be output.
If none of the sides, when extended, intersects the polygon, it is a convex polygon; otherwise it is concave.
We calculated the AOD value for each 4-km grid cell as the area-weighted average of the AOD values of the Thiessen polygons intersecting with this cell.
The region library (C version) was re-written in CIAO 4.8, so that some routines may give different answers, in particular when handling self-intersecting (non-simple) polygons.
Then, both the intersect output (containing polygons representing the total urban area within each unit uniquely identified by its 'IPUMSID') and the country vector administrative unit dataset were rasterized, at the resolution of the corresponding raster population dataset (i.e., 3 arc seconds 3 arc equals to approximately 100 m at the equator), and co-registered with it.
In the vicinity of material interfaces, the swept region is intersected with pure material polygons in the Lagrangian mesh to construct the material fluxes.
The different polygons were intersected with the outline vector file of the study area and the area excluding the digitised polygons was assigned as cropland.
Because groundwater dependent wetlands are defined by hydric or partially hydric soils [20], [21] we intersected the composite geospatial polygons with soils that contained "hydric" or "partially hydric" components from NRCS STATSGO2 [22].
1/a selection is done on the parcels of "Work_layer" that intersect the active polygon from "Contaminated area".
