Abstract: GIS polygon-based (also know as vector-based) spatial data overlay computation is much more complex than raster data computation. Processing of polygonal spatial data files has been a long ...

method MAP (id, polygon p) { compute bounding box b of p find overlapping grid cell(s) C for p based on b for all grid cell ∈ C do EMIT: (cell id, p) end for } method REDUCE (cell id, [p1, p2, ..]) { ...

Abstract: Polygon overlay is one of the complex operations in Geographic Information Systems (GIS). In GIS, a typical polygon tends to be large in size often consisting of thousands of vertices.

Google Maps labels (city names) render above custom Polygon overlay in the package, preventing proper masking/overlay functionality. I would want the Polygon to render above all elements of the ...

ALK Technologies has added new map overlays to its ALK Maps mapping platform that provide visual information for better route planning and data insight. ALK Maps' new visualization overlays include ...