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Kinds of LatLongs: https://msdn.microsoft.com/en-us/library/aa578799.aspx
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Geo:URI => geo:lat,lon[,alt]
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GeoJSON: {"type": "Point", "coordinates": [lon, lat[, alt]]}
Point coordinates are in x, y order
- easting, northing for projected coordinates
- longitude, and latitude for geographic coordinates
The coordinate reference system for all GeoJSON coordinates is a geographic coordinate reference system, using the World Geodetic System 1984 (WGS 84) [WGS84] datum, with longitude and latitude units of decimal degrees.
The latitude must be a number between -90 and 90 and the longitude between -180 and 180.
For lats and longs:
- 6 decimal places will provide accuracy up-to 4 inches.
- 8 decimal places will provide accuracy up-to 1 cm