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*Native functions for geogrphy:
'''ST_AsText(geography) ''' returns text '''ST_GeographyFromText(text) ''' returns geography '''ST_AsBinary(geography) ''' returns bytea '''ST_GeogFromWKB(bytea) ''' returns geography '''ST_AsSVG(geography) ''' returns text '''ST_AsGML(geography) ''' returns text '''ST_AsKML(geography) ''' returns text '''ST_AsGeoJson(geography) ''' returns text '''ST_Distance(geography, geography) ''' returns double '''ST_DWithin(geography, geography, float8) ''' returns boolean '''ST_Area(geography) ''' returns double '''ST_Length(geography) ''' returns double '''ST_Covers(geography, geography) ''' returns boolean '''ST_CoveredBy(geography, geography) ''' returns boolean '''ST_Intersects(geography, geography) ''' returns boolean '''ST_Buffer(geography, float8) ''' returns geography [1] '''ST_Intersection(geography, geography) ''' returns geography [1]
* Continue reading from: http://workshops.boundlessgeo.com/postgis-intro/geography.html
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