System.Data.Spatial DbGeography.Distance units?

c# gps entity-framework-5 spatial
Roger Johansson picture Roger Johansson · Dec 18, 2012 · Viewed 9.7k times · Source

When measuring the distance between two locations using the DbGeography.Distance(otherLocation) what is the unit of the distance?

Even the msdn information and the intellisense fails to specify the unit of the distance.

Anyone knows?

[edit] I'm using srid 4326. which most examples seems to use. From what I can find, 4326 seems to be radians, this leaves me completely clueless. radians are used to measure angles/degrees so what does this mean in reality ?

Answer

Sign picture Sign · Dec 18, 2012

Several articles seem to agree on meters being used in 4326 as the unit of distance.

WGS 84 is done in meters as well, which is probably why this uses meters.

http://blogs.msdn.com/b/adonet/archive/2011/06/30/walkthrough-spatial-june-ctp.aspx http://www.jasonfollas.com/blog/archive/2011/07/20/entity-framework-spatial-first-look.aspx http://blog.simplecode.eu/post/DistancesWithDbGeographyAndDbGeometry

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