Unpack vector information into numpy arrays

[uniomni]

Raster data naturally maps to numeric arrays for processing.
Risk-in-a-Box server will also need to extract vector data (points, lines and polygons) from data downloaded from GeoServer. The format is most likely GeoJSON. A suitable format for point data would be something like Nx3 arrays x,y, z in each row where x is longitude, y is latitude and z is an attribute value. Similar formats need to be found for line and polygon data.

Presumably these arrays can be wrapped into objects that contain necessary metadata.