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rename boundary doc

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Andy Eschbacher
2016-05-11 13:27:58 -04:00
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doc/API.md
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@@ -5,6 +5,6 @@ This file is for reference purposes only. It is intended for tracking the Data O
## Documentation
* [Measures Functions](measures_functions.md)
* [Boundaries Functions](boundaries_functions.md)
* [Boundary Functions](boundary_functions.md)
* [Discovery Functions](discovery_functions.md)
* [Glossary](glossary.md)
* [Glossary](glossary.md)

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doc/boundaries_functions.md → doc/boundary_functions.md
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# Boundaries Functions
# Boundary Functions
Use the following functions to retrieve [Boundary](/cartodb-platform/dataobservatory/overview/#boundary-data) data. Data ranges from small areas (e.g. US Census Block Groups) to large areas (e.g. Countries). You can access boundaries by point location lookup, bounding box lookup, direct ID access and several other methods described below.
## OBS_GetBoundariesByGeometry(polygon geometry, geometry_id text)
The ```OBS_GetBoundariesByGeometry(geometry, geometry_id)``` method returns a set of boundary geometries that intersect a supplied geometry. This can be used to find all boundaries that are within or overlap a bounding box. You have the ability to choose whether to retrieve all boundaries that intersect your supplied bounding box or only those that fall entirely inside of your bounding box.
#### Arguments
Name |Description
--- | ---
polygon | a bounding box or other WGS84 geometry
geometry_id | a string identifier for a boundary geometry
timespan (optional) | year(s) to request from ('NULL' (default) gives most recent)
overlap_type (optional) | one of '[intersects](http://postgis.net/docs/manual-2.2/ST_Intersects.html)' (default), '[contains](http://postgis.net/docs/manual-2.2/ST_Contains.html)', or '[within](http://postgis.net/docs/manual-2.2/ST_Within.html)'.
#### Returns
A table with the following columns:
Column Name | Description
--- | ---
the_geom | a boundary geometry (e.g., US Census tract boundaries)
geom_refs | a string identifier for the geometry (e.g., geoids of US Census tracts)
#### Example
Get all Census Tracts in Lower Manhattan plus nearby areas within the supplied bounding box.
```sql
SELECT *
FROM OBS_GetBoundariesByGeometry(
ST_MakeEnvelope(-74.0251922607,40.6945658517,
-73.9651107788,40.7377626342,
4326),
'us.census.tiger.census_tract')
```
#### API Example
Retrieve all Census tracts contained in a bounding box around Denver, CO as a JSON response:
```text
http://observatory.cartodb.com/api/v2/sql?q=SELECT * FROM OBS_GetBoundariesByGeometry(ST_MakeEnvelope(-105.4287704158,39.4600507935,-104.5089737248,40.0901569675,4326),'us.census.tiger.census_tract', NULL, 'contains')
```
## OBS_GetPointsByGeometry(polygon geometry, geometry_id text)
The ```OBS_GetPointsByGeometry(polygon, geometry_id)``` method returns point geometries and their geographical identifiers that intersect (or are contained by) a bounding box polygon and lie on the surface of a boundary corresponding to the boundary with same geographical identifiers (e.g., a point that is on a census tract with the same geoid). This is a useful alternative to ```OBS_GetBoundariesByGeometry``` listed above because it returns much less data for each location.
#### Arguments
Name |Description
--- | ---
polygon | a bounding box or other geometry
geometry_id | a string identifier for a boundary geometry
timespan (optional) | year(s) to request from (`NULL` (default) gives most recent)
overlap_type (optional) | one of '[intersects](http://postgis.net/docs/manual-2.2/ST_Intersects.html)' (default), '[contains](http://postgis.net/docs/manual-2.2/ST_Contains.html)', or '[within](http://postgis.net/docs/manual-2.2/ST_Within.html)'.
#### Returns
A table with the following columns:
Column Name | Description
--- | ---
the_geom | a point geometry on a boundary (e.g., a point that lies on a US Census tract)
geom_refs| a string identifier for the geometry (e.g., the geoid of a US Census tract)
#### Example
Get all Census Tracts in Lower Manhattan plus nearby areas within the supplied bounding box.
```sql
SELECT *
FROM OBS_GetPointsByGeometry(
ST_MakeEnvelope(-74.0251922607,40.6945658517,
-73.9651107788,40.7377626342,
4326),
'us.census.tiger.census_tract')
```
#### API Example
Retrieve all Census tracts intersecting a bounding box around Denver, CO as a JSON response:
```text
http://observatory.cartodb.com/api/v2/sql?q=SELECT * FROM OBS_GetPointsByGeometry(ST_MakeEnvelope(-105.4287704158,39.4600507935,-104.5089737248,40.0901569675,4326), 'us.census.tiger.census_tract', NULL ,'contains')
```
## OBS_GetBoundary(point_geometry, boundary_id)
The ```OBS_GetBoundary(point_geometry, boundary_id)``` method 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 table below](below). This is a useful method for performing aggregations of points.
@@ -97,92 +183,6 @@ FROM tablename
GROUP BY geometry_id
```
## OBS_GetBoundariesByGeometry(polygon geometry, geometry_id text)
The ```OBS_GetBoundariesByGeometry(geometry, geometry_id)``` method returns a set of boundary geometries that intersect a supplied geometry. This can be used to find all boundaries that are within or overlap a bounding box. You have the ability to choose whether to retrieve all boundaries that intersect your supplied bounding box or only those that fall entirely inside of your bounding box.
#### Arguments
Name |Description
--- | ---
polygon | a bounding box or other WGS84 geometry
geometry_id | a string identifier for a boundary geometry
timespan (optional) | year(s) to request from ('NULL' (default) gives most recent)
overlap_type (optional) | one of '[intersects](http://postgis.net/docs/manual-2.2/ST_Intersects.html)' (default), '[contains](http://postgis.net/docs/manual-2.2/ST_Contains.html)', or '[within](http://postgis.net/docs/manual-2.2/ST_Within.html)'.
#### Returns
A table with the following columns:
Column Name | Description
--- | ---
the_geom | a boundary geometry (e.g., US Census tract boundaries)
geom_refs | a string identifier for the geometry (e.g., geoids of US Census tracts)
#### Example
Get all Census Tracts in Lower Manhattan plus nearby areas within the supplied bounding box.
```sql
SELECT *
FROM OBS_GetBoundariesByGeometry(
ST_MakeEnvelope(-74.0251922607,40.6945658517,
-73.9651107788,40.7377626342,
4326),
'us.census.tiger.census_tract')
```
#### API Example
Retrieve all Census tracts contained in a bounding box around Denver, CO as a JSON response:
```text
http://observatory.cartodb.com/api/v2/sql?q=SELECT * FROM OBS_GetBoundariesByGeometry(ST_MakeEnvelope(-105.4287704158,39.4600507935,-104.5089737248,40.0901569675,4326),'us.census.tiger.census_tract', NULL, 'contains')
```
## OBS_GetPointsByGeometry(polygon geometry, geometry_id text)
The ```OBS_GetPointsByGeometry(polygon, geometry_id)``` method returns point geometries and their geographical identifiers that intersect (or are contained by) a bounding box polygon and lie on the surface of a boundary corresponding to the boundary with same geographical identifiers (e.g., a point that is on a census tract with the same geoid). This is a useful alternative to ```OBS_GetBoundariesByGeometry``` listed above because it returns much less data for each location.
#### Arguments
Name |Description
--- | ---
polygon | a bounding box or other geometry
geometry_id | a string identifier for a boundary geometry
timespan (optional) | year(s) to request from (`NULL` (default) gives most recent)
overlap_type (optional) | one of '[intersects](http://postgis.net/docs/manual-2.2/ST_Intersects.html)' (default), '[contains](http://postgis.net/docs/manual-2.2/ST_Contains.html)', or '[within](http://postgis.net/docs/manual-2.2/ST_Within.html)'.
#### Returns
A table with the following columns:
Column Name | Description
--- | ---
the_geom | a point geometry on a boundary (e.g., a point that lies on a US Census tract)
geom_refs| a string identifier for the geometry (e.g., the geoid of a US Census tract)
#### Example
Get all Census Tracts in Lower Manhattan plus nearby areas within the supplied bounding box.
```sql
SELECT *
FROM OBS_GetPointsByGeometry(
ST_MakeEnvelope(-74.0251922607,40.6945658517,
-73.9651107788,40.7377626342,
4326),
'us.census.tiger.census_tract')
```
#### API Example
Retrieve all Census tracts intersecting a bounding box around Denver, CO as a JSON response:
```text
http://observatory.cartodb.com/api/v2/sql?q=SELECT * FROM OBS_GetPointsByGeometry(ST_MakeEnvelope(-105.4287704158,39.4600507935,-104.5089737248,40.0901569675,4326), 'us.census.tiger.census_tract', NULL ,'contains')
```
## OBS_GetBoundariesByPointAndRadius(point geometry, radius numeric, boundary_id text)
The ```OBS_GetBoundariesByPointAndRadius(point, radius, boundary_id)``` method returns boundary geometries and their geographical identifiers that intersect (or are contained by) a circle centered on a point with a radius.