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ArcGIS supports spheres or ellipsoids (spheroids) with the azimuthal equidistant projection. Here's a sample prj (wkt) string for "World_Azimuthal_Equidistant" based on WGS 1984. PROJCS["World_Azimuthal_Equidistant", GEOGCS["GCS_WGS_1984", DATUM["D_WGS_1984", SPHEROID["WGS_1984",6378137.0,298.257223563]], PRIMEM["Greenwich",0.0], ...


You have to specify the projection on a sphere, because proj seems to only support the spherical formulas of this projection: +proj=aeqd +R=6371000 +lat_0=51.0246 +lon_0=-113.3981 For some example plots, see Manipulating Azimuthal Equidistant Projections in QGIS


Have a look at "Extreme points of Canadian provinces" from Wikipedia.


You can use Open Street Map Nominatim API for Geocoding and it will return the bounding box Example: Manitoba, Canada http://nominatim.openstreetmap.org/search?q=Manitoba,%20Canada&format=xml&polygon=1 Response (xml) boundingbox="49.9971285,49.9972285,-96.8892673,-96.8891673" ...


You can download Country Boundaries from Natural Earth: http://www.naturalearthdata.com/http//www.naturalearthdata.com/download/110m/cultural/ne_110m_admin_0_countries.zip Found here: http://www.naturalearthdata.com/downloads/110m-cultural-vectors/

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