Area returns the area of a given Geography.

Azimuth returns the azimuth in radians of the segment defined by the given point geometries.

BestGeomProjection translates roughly to the ST_BestSRID function in PostGIS.

BoundingBoxHasNaNCoordinates checks if the bounding box of a Geography has a NaN coordinate.

Centroid returns the Centroid of a given Geography.

CoveredBy returns whether geography A is covered by geography B.

Covers returns whether geography A covers geography B.

Distance returns the distance between geographies a and b on a sphere or spheroid.

DWithin returns whether a is within distance d of b.

Intersects returns whether geography A intersects geography B.

Length returns length of a given Geography.

Perimeter returns the perimeter of a given Geography.

Project returns calculate a projected point given a source point, a distance and a azimuth.

Segmentize return modified Geography having no segment longer that given maximum segment length.

SpheroidErrorFraction is an error fraction to compensate for using a sphere to calculate the distance for what is actually a spheroid.

UseSphere indicates to use the sphere for calculations.

UseSpheroid indicates to use the spheroid for calculations.

UseSphereOrSpheroid indicates whether to use a Sphere or Spheroid for certain calculations.