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What are Geospatial Functions on Snowflake?

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What are Geospatial Functions on Snowflake?

Daniel Steinhold Answered question July 26, 2023
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Snowflake provides a set of geospatial functions that allow you to work with and analyze spatial data. These functions enable operations such as distance calculations, geometric manipulations, and spatial queries.

Geospatial functions operate on [GEOGRAPHY](https://docs.snowflake.com/en/sql-reference/data-types-geospatial.html#label-data-types-geography) and [GEOMETRY](https://docs.snowflake.com/en/sql-reference/data-types-geospatial.html#label-data-types-geometry) and convert GEOGRAPHY and GEOMETRY values to and from other representations (such as VARCHAR).

Here are some commonly used geospatial functions in Snowflake:

1. ST_DISTANCE: Calculates the distance between two spatial objects.
Example: **`ST_DISTANCE(geometry1, geometry2)`** calculates the distance between two geometries.
2. ST_CONTAINS: Determines whether one spatial object contains another.
Example: **`ST_CONTAINS(polygon, point)`** checks if a point is within a polygon.
3. ST_INTERSECTS: Determines whether two spatial objects intersect each other.
Example: **`ST_INTERSECTS(geometry1, geometry2)`** checks if two geometries intersect.
4. ST_ASGEOJSON: Converts a spatial object to a GeoJSON representation.
Example: **`ST_ASGEOJSON(geometry)`** converts a geometry to a GeoJSON string.
5. ST_GEOMFROMTEXT: Converts a Well-Known Text (WKT) representation to a geometry.
Example: **`ST_GEOMFROMTEXT('POINT(45.0 30.0)')`** converts a WKT point to a geometry.
6. ST_AREA: Calculates the area of a polygon.
Example: **`ST_AREA(polygon)`** computes the area of a polygon.
7. ST_BUFFER: Creates a buffer zone around a spatial object.
Example: **`ST_BUFFER(geometry, distance)`** creates a buffer around a geometry.
8. ST_LENGTH: Calculates the length of a line or the perimeter of a polygon.
Example: **`ST_LENGTH(line)`** computes the length of a line.
9. ST_TRANSFORM: Converts a geometry from one spatial reference system to another.
Example: **`ST_TRANSFORM(geometry, spatial_reference_system)`** transforms a geometry to a different coordinate system.
10. ST_WITHIN: Determines if one spatial object is within another.
Example: **`ST_WITHIN(point, polygon)`** checks if a point is within a polygon.

These are some commonly used geospatial functions available in Snowflake. These functions allow you to perform spatial operations and analysis on your geospatial data. The Snowflake documentation provides a comprehensive list of geospatial functions with detailed explanations and usage examples.

Daniel Steinhold Answered question July 26, 2023
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