Microsoft SQL ServerSpatial Data

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There are 2 spatial data types

Geometry X/Y coordinate system for a flat surface

Geography Latitude/Longitude coordinate system for a curved surface (the earth). There are multiple projections of curved surfaces so each geography spatial must let SQL Server know which projection to use. The usual Spatial Reference ID (SRID) is 4326, which is measuring distances in Kilometers. This is the default SRID used in most web maps

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