Useful Shapefiles


GPS Control Network

The SWRCMP maintains a network of GPS control points around the south west coast. In January 2016 all of the control points were updated to the OSTN15 transformation. The Map Viewer uses the OSTN15 coordinates. Both the OSTN02 and the OSTN15 control network shapefiles are available for download:


GPS Control Points OSTN15 Shapefile

GPS Control Points OSTN02 Shapefile


PDF files with witness diagrams for all points in our control network are also available for download:


OSTN15 Witness Diagrams - Portland Bill to Start Point

OSTN15 Witness Diagrams - Start Point to Gribbin Head

OSTN15 Witness Diagrams - Gribbin Head to Land's End

OSTN15 Witness Diagrams - Land's End to Hartland Point

OSTN15 Witness Diagrams-Hartland Point to Beachley Point

OSTN15 Witness Diagrams - Isles of Scilly