Retrieve the polygon information for the park unit from NPS REST services
Source:R/geography.R
get_park_polygon.Rd
get_park_polygon()
retrieves a geoJSON string for a polygon of
a park unit. This is not the official boundary. Note that the REST API call returns the default "convexHull". This is will work better or worse for some parks, depending on the park shape/geography/number of disjunct areas.
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