LIDAR Composite DTM 2017 - 25cm
This retired dataset provided a raster digital terrain model (DTM) covering parts of England at 25cm resolution, produced by the Environment Agency in 2017 from merged and re-sampled time-stamped LIDAR archive data, using the most recent survey where repeats existed. Surface objects were removed from the digital surface model to leave a bare-earth terrain model, with vertical accuracy of +/-15cm RMSE. Data was distributed as ASCII files in 5km grids, referenced to Ordnance Survey Newlyn using the OSTN'15 transformation, with an accompanying tinted shaded-relief WMS feed and survey index files. It has been superseded by a 1m resolution composite, with the full archive now available via the Environment Agency's survey download page. Published by Defra.This dataset is retired and no longer available on the Data Services Platform. The Environment Agency Geomatics team no longer produce a 25cm resolution composite product. This has been replaced by a 1m resolution version. The entire archive of lidar data, including the 1m composite and 25cm time-stamped data, is available to download from the following page: https://environment.data.gov.uk/survey. The LIDAR Composite DTM (Digital Terrain Model) is a raster elevation model covering areas of England at 25cm spatial resolution. Produced by the Environment Agency in 2017, this dataset is derived from a combination of our full time stamped archive, which has been merged and re-sampled to give the possible coverage. Where repeat surveys have been undertaken the newest, resolution data is used. The composite is updated on an annual basis to include the latest surveys. The DTM (Digital Terrain Model) is produced from the last return LIDAR signal. We remove surface objects from the Digital Surface Model (DSM), using bespoke algorithms and manual editing of the data, to produce a terrain model of just the surface. Available to download as ASCII files in 5km grids, data is presented in metres, referenced to Ordinance Survey Newlyn, using the OSTN’15 transformation. All LIDAR data has a vertical accuracy of +/-15cm RMSE. A tinted shaded relief, which is an image showing what LIDAR looks like when loaded into specialist software, is also available as a WMS feed. You can also download survey index files which shows, for any location, what Time Stamped survey went into the production of the LIDAR composite. Light Detection and Ranging (LIDAR) is an airborne mapping technique, which uses a laser to measure the distance between the aircraft and the ground. Up to 500,000 measurements per second are made of the ground, allowing highly detailed terrain models to be generated at spatial resolutions of between 25cm and 2 metres. The Environment Agency’s open data LIDAR arc.
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Data schema (11 fields)
Click a field to see example values.
| Field | Type | Description |
|---|---|---|
| filename | string | Original filename or reference code for the lidar survey file.Original filename or reference code for the lidar survey file. |
| tilename | string | Identifier of the map tile covered by this data.Identifier of the map tile covered by this data. |
| polygon_idPolygon id | string | Identifier for the survey coverage polygon.Identifier for the survey coverage polygon. |
| resolution | decimal | Spatial resolution of the data in metres.Spatial resolution of the data in metres. |
| year | string | Year in which the lidar survey was flown.Year in which the lidar survey was flown. |
| od_dtm_fnOd dtm fn | string | Output filename of the digital terrain model dataset.Output filename of the digital terrain model dataset. |
| sd_flownSd flown | dateTime | Start date of the lidar survey flight.Start date of the lidar survey flight. |
| ed_flownEd flown | dateTime | End date of the lidar survey flight.End date of the lidar survey flight. |
| gdb_geomattr_dataGdb geomattr data | hexBinary | Binary geodatabase geometry attribute data.Binary geodatabase geometry attribute data. |
| shape | geometry | Geometry outlining the tile or survey area.Geometry outlining the tile or survey area. |
| od_dsm_fnOd dsm fn | string | Output filename of the digital surface model dataset.Output filename of the digital surface model dataset. |
Schema captured from wfs 22 days ago.
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Sample data (3 records)
Record 1year: 2000 · ed_flown: 2000-06-06T00:00:00Z
{
"year": "2000",
"ed_flown": "2000-06-06T00:00:00Z",
"filename": "V0011335",
"sd_flown": "2000-06-06T00:00:00Z",
"tilename": "SW4624",
"od_dtm_fn": "DTM_V0011335_20000606_20000606",
"polygon_id": "P_1656",
"resolution": 1,
"gdb_geomattr_data": null
}Record 2year: 2003 · ed_flown: 2003-07-14T00:00:00Z
{
"year": "2003",
"ed_flown": "2003-07-14T00:00:00Z",
"filename": "V0028526",
"sd_flown": "2003-07-14T00:00:00Z",
"tilename": "SY5087",
"od_dtm_fn": "DTM_V0028526_20030714_20030714",
"polygon_id": "P_2410",
"resolution": 0.5,
"gdb_geomattr_data": null
}Record 3year: 2003 · ed_flown: 2003-07-14T00:00:00Z
{
"year": "2003",
"ed_flown": "2003-07-14T00:00:00Z",
"filename": "V0028533",
"sd_flown": "2003-07-14T00:00:00Z",
"tilename": "SY5286",
"od_dtm_fn": "DTM_V0028533_20030714_20030714",
"polygon_id": "P_2410",
"resolution": 0.5,
"gdb_geomattr_data": null
}Live sample captured at profiling time — values may have changed upstream.
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Using the API
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- Base URL
- https://environment.data.gov.uk/spatialdata/survey-index-files/wms
License
Terms stated by the source (not a recognized license):
These datasets have been made freely available by Defra and its agencies for your use. You can either download them as digital GIS data onto your desktop, or you can access them as an Open Geospatial Consortium (OGC) Web Feature Services (WFS).
Query examples
curl -s 'https://environment.data.gov.uk/spatialdata/survey-index-files/wfs?service=WFS&version=2.0.0&request=GetCapabilities' -H 'Accept: application/json'List the feature types (layers) and supported operations.
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License
No license declared upstream.