45 lines
1.3 KiB
Markdown
45 lines
1.3 KiB
Markdown
## TINMAP function
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Generates a fake contour map, in the form of a TIN map, from a set of scattered points.Depends on **CDB_Densify**.
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Its iterative nature lets the user smooth the final result as much as desired, but with a exponential time cost increase.
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### CDB_TINmap(geomin geometry[], colin numeric[], iterations integer)
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#### Arguments
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| Name | Type | Description |
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|------|------|-------------|
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| geomin | geometry[] | Array of points geometries |
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| colin | numeric[] | Array of points' values |
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| iterations | integer | Number of iterations |
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### Returns
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Returns a table object
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| Name | Type | Description |
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|------|------|-------------|
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| geomout | geometry | Geometries of new dataset of polygons|
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| colout | numeric | Values of each cell|
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#### Example Usage
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```sql
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WITH data as (
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SELECT
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ARRAY[7.0,8.0,1.0,2.0,3.0,5.0,6.0,4.0] as colin,
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ARRAY[ST_GeomFromText('POINT(2.1744 41.4036)'),
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ST_GeomFromText('POINT(2.1228 41.3809)'),
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ST_GeomFromText('POINT(2.1511 41.3742)'),
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ST_GeomFromText('POINT(2.1528 41.4136)'),
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ST_GeomFromText('POINT(2.165 41.3917)'),
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ST_GeomFromText('POINT(2.1498 41.3713)'),
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ST_GeomFromText('POINT(2.1533 41.3683)'),
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ST_GeomFromText('POINT(2.131386 41.413998)')] as geomin
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)
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SELECT cdb_crankshaft.CDB_TINmap(geomin, colin, 2)
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FROM data
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```
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