GeoVisibleRegionBoundary

GeoVisibleRegionBoundary[{lat,lon,h}] is a one-dimensional GeoGraphics primitive that represents the boundary of the region on the surface of the Earth visible from the point of coordinates lat,lon and height h above the reference ellipsoid.

GeoVisibleRegionBoundary[pos] represents the boundary of the region visible from the position pos.

GeoVisibleRegionBoundary[{pos1,pos2,…}] represents the collection of boundaries of the regions visible from the positions posi.

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