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Spatial REST

Spatial RESTful services are provided by the Dirt-Simple PostGIS HTTP API and are exposed at http://lancasteruad.oxfordarchaeology.com/pgrest/.

See http://lancasteruad.oxfordarchaeology.com/pgrest/index.html for available functions.

List of available tables

All spatial tables are in EPSG:27700 (British National Grid). Their geometry type is given below:

  • cellars: dataset of Lancaster Buildings showing presence or absence of cellars - point
  • studyarea: study area boundary of Lancaster Urban Archaeological Database project - multipolygon
  • listed_polys: boundaries of listed buildings - multipolygon
  • event_points_full: dataset representing historic or archaeological events - point
  • event_polys: dataset representing the outline of events such as archaeological digs - multipolygon
  • mons_points_full: dataset representing historic or archaeological monuments - point
  • monspres_polys: dataset representing definite monument outlines, eg extant or exposed by archaeological events - multipolygon
  • monsint_polys: proposed outlines of monuments based on information from archaeological research, events and other information - multipolygon
  • geophys: contour lines from geophysical survey - line (note this data has no attributes so might be best as base mapping)

The ws_geo_listlayers endpoint will provide you with this list in json format:

http://lancasteruad.oxfordarchaeology.com/pgrest/v1/ws_geo_listlayers.php

Getting information on a table

The ws_listfields endpoint will provide information on the fields/columns for a particular table in json format. Call it like so:

http://lancasteruad.oxfordarchaeology.com/pgrest/v1/ws_listfields.php?table=tablename

Performing a spatial query

PGRest assumes that the coordinate system (srid) is EPSG:4326 and that the geometry column (geometryfield) is called the_geom. This is incorrect for the Lancaster UAD- so you will need to explicitly state the srid and geometry_field whenever you do a spatial query. The URLs below show the correct format to use:

http://lancasteruad.oxfordarchaeology.com/pgrest/v1/ws_geo_getextent.php?table=monsint_polys&srid=27700&geometryfield=wkb_geometry

http://lancasteruad.oxfordarchaeology.com/pgrest/v1/ws_geo_getcentroid.php?table=monspres_polys&srid=4326&geometryfield=wkb_geometry&parameters=monid=%27531%27