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updated hyperlinks to platform location

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csobier 2016-05-10 09:41:03 -04:00
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doc/boundaries_functions.md
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# Boundaries Functions # Boundaries Functions
If you are using the [boundary methods](/dataobservatory/overview/#boundary-methods) from the Data Observatory, use the following functions to retrieve [Boundary](/dataobservatory/overview/#boundary-data) data. You can get global boundary geometries by point or polygon geometries. If you are using the [boundary methods](/cartodb-platform/dataobservatory/overview/#boundary-methods) from the Data Observatory, use the following functions to retrieve [Boundary](/cartodb-platform/dataobservatory/overview/#boundary-data) data. You can get global boundary geometries by point or polygon geometries.
## OBS_GetGeometry(point_geometry, boundary_id) ## OBS_GetGeometry(point_geometry, boundary_id)
The ```OBS_GetGeometry(point_geometry, boundary_id)``` function returns a boundary geometry defined as overlapping the point geometry and from the desired boundary set (e.g. Census Tracts). See the [Boundary ID glossary](/dataobservatory/glossary/#boundary-ids). This is useful for performing aggregations of points. The ```OBS_GetGeometry(point_geometry, boundary_id)``` function returns a boundary geometry defined as overlapping the point geometry and from the desired boundary set (e.g. Census Tracts). See the [Boundary ID glossary](/cartodb-platform/dataobservatory/glossary/#boundary-ids). This is useful for performing aggregations of points.
#### Arguments #### Arguments
Name | Description Name | Description
--- | --- --- | ---
point_geometry | a WGS84 polygon geometry (the_geom) point_geometry | a WGS84 polygon geometry (the_geom)
boundary_id | a boundary identifier from the [Boundary ID glossary](/dataobservatory/glossary/#boundary-ids) boundary_id | a boundary identifier from the [Boundary ID glossary](/cartodb-platform/dataobservatory/glossary/#boundary-ids)
#### Returns #### Returns
@ -33,14 +33,14 @@ Should add the SQL API call here too
## OBS_GetGeometryId(point_geometry, boundary_id) ## OBS_GetGeometryId(point_geometry, boundary_id)
The ```OBS_GetGeometryId(point_geometry, boundary_id)``` returns a unique geometry_id for the boundary geometry that contains a given point geometry. See the [Boundary ID glossary](/dataobservatory/glossary/#boundary-ids). The function can be combined with ```OBS_GetGeometryById(geometry_id)``` to create a point aggregation workflow. The ```OBS_GetGeometryId(point_geometry, boundary_id)``` returns a unique geometry_id for the boundary geometry that contains a given point geometry. See the [Boundary ID glossary](/cartodb-platform/dataobservatory/glossary/#boundary-ids). The function can be combined with ```OBS_GetGeometryById(geometry_id)``` to create a point aggregation workflow.
#### Arguments #### Arguments
Name |Description Name |Description
--- | --- --- | ---
point_geometry | a WGS84 polygon geometry (the_geom) point_geometry | a WGS84 polygon geometry (the_geom)
boundary_id | a boundary identifier from the [Boundary ID glossary](/dataobservatory/glossary/#boundary-ids) boundary_id | a boundary identifier from the [Boundary ID glossary](/cartodb-platform/dataobservatory/glossary/#boundary-ids)
#### Returns #### Returns
@ -80,4 +80,4 @@ Use a table of geometry_id to select the unique boundaries. Useful with the ```T
```SQL ```SQL
SELECT OBS_GetGeometryById(geometry_id) the_geom, geometry_id FROM tablename GROUP BY geometry_id SELECT OBS_GetGeometryById(geometry_id) the_geom, geometry_id FROM tablename GROUP BY geometry_id
``` ```