LIDAR Composite DTM 2017 - 50cm
This discontinued dataset provided a raster Digital Terrain Model (DTM) covering areas of England at 50cm resolution, produced by the Environment Agency in 2017 from its full time-stamped LIDAR archive, merged and re-sampled to maximise coverage and updated annually with newest surveys. The DTM was derived from the last-return LIDAR signal with surface objects removed from the Digital Surface Model via algorithms and manual editing. Data was distributed as ASCII files in 2km grids, referenced to Ordnance Survey Newlyn using OSTN'15, with vertical accuracy of ±15cm RMSE. A tinted shaded relief WMS feed and survey index files were also available. It has been superseded by the LIDAR Composite DSM 2020 dataset.This dataset is no longer available on the Data Services Platform. New version of the LIDAR Composite DSM data is available here: https://environment.data.gov.uk/searchresults;query=lidar%20composite%202020;searchtype=All;page=1;pagesize=20;orderby=Relevancy The LIDAR Composite DTM (Digital Terrain Model) is a raster elevation model covering areas of England at 50cm 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 2km 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 archives includes the Point Cloud data, and derived raster surface models of survey specific areas and composites of the data available in any.
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Data schema (11 fields)
Click a field to see example values.
| Field | Type | Description |
|---|---|---|
| filename | string | Original source file identifier for the survey.Original source file identifier for the survey. |
| tilename | string | National grid tile reference for the data tile.National grid tile reference for the data tile. |
| polygon_idPolygon id | string | Unique identifier for the coverage polygon.Unique identifier for the coverage polygon. |
| resolution | decimal | Spatial resolution of the elevation data in metres.Spatial resolution of the elevation data in metres. |
| year | string | Year the LIDAR survey data was collected.Year the LIDAR survey data was collected. |
| od_dtm_fnOd dtm fn | string | Original output filename of the associated DTM dataset.Original output filename of the associated DTM dataset. |
| sd_flownSd flown | dateTime | Start date the LIDAR survey flight was flown.Start date the LIDAR survey flight was flown. |
| ed_flownEd flown | dateTime | End date the LIDAR survey flight was flown.End date the LIDAR survey flight was flown. |
| gdb_geomattr_dataGdb geomattr data | hexBinary | Internal geodatabase geometry attribute data.Internal geodatabase geometry attribute data. |
| shape | geometry | Geometry defining the spatial extent of the tile.Geometry defining the spatial extent of the tile. |
| od_dsm_fnOd dsm fn | string | Original output filename of the associated DSM dataset.Original output filename of the associated DSM dataset. |
Schema captured from wfs 26 days ago.
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Pick columns and a sort, then fetch a live preview straight from the source. Choose an API-filterable column (marked ▾) under “Where” to pick from its list of values.
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
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.
Dataset
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License
No license declared upstream.