LIDAR Composite First Return Digital Surface Model (FZ_DSM) - 1m
Summary
The LIDAR Composite First Return DSM (Digital Surface Model) is a raster elevation model covering ~99% of England at 1m spatial resolution. The first return DSM is produced from the first or only laser pulse returned to the sensor and includes heights of objects, such as vehicles, buildings and vegetation, as well as the terrain surface where the first or only return was the ground.
Produced by the Environment Agency in 2022, the first return DSM is derived from data captured as part of our national LIDAR programme between 11 November 2016 and 5th May 2022. This programme divided England into ~300 blocks for survey over continuous winters from 2016 onwards. These surveys are merged together to create the first return LIDAR composite using a feathering technique along the overlaps to remove any small differences in elevation between surveys. Please refer to the metadata index catalgoues which show for any location which survey was used in the production of the LIDAR composite.
The first return DSM will not match in coverage or extent of the LIDAR composite last return digital surface model (LZ_DSM) as the last return DSM composite is produced from both the national LIDAR programme and Timeseries surveys.
The data is available to download as GeoTiff rasters in 5km tiles aligned to the OS National grid. The data is presented in metres, referenced to Ordinance Survey Newlyn and using the OSTN’15 transformation method. All individual LIDAR surveys going into the production of the composite had a vertical accuracy of +/-15cm RMSE.
Categories
Use limitation statement
There are no public access constraints to this data. Use of this data is subject to the licence identified.
Licence
Open Government LicenceAttribution statement
© Environment Agency copyright and/or database right 2022. All rights reserved.
Technical information
Update frequency
annually
Lineage
Light Detection and Ranging (LIDAR) is an airborne mapping technique, which uses a laser to measure the height of the terrain and surface objects on the ground such as trees and buildings. Hundreds of thousands of 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 vertical accuracy of the LIDAR dataset is +/-15cm RMSE.
Spatial information
Coordinate reference system
http://www.opengis.net/def/crs/EPSG/0/27700Geographic extent
- Latitude from: 49.943 to 55.816
- Longitude from: -6.236 to 2.072
Metadata information
Language
English
Metadata identifier
df4e3ec3-315e-48aa-aaaf-b5ae74d7b2bb
Published by
Environment Agency
Contact publisher
Defra Data Services ForumDataset reference dates
Creation date
08 February 2023
Revision date
15 December 2023
Publication date
N/A
Period
- From: 11 November 2016
- To: 05 May 2022
Search
Data and Supporting Information
Data services and download by area of interest | Link | Action |
---|---|---|
Download the survey data | Open link | |
Download the coverage metadata files | N/A | Open link |
Survey Data FAQs | Open link | |
LIDAR Composite First Return Digital Survey Model (FZ_DSM) - 1m - WMS | Copy link | Preview |
Metadata Survey Index Catalogues - WMS | Copy link | Preview |
Metadata Survey Index Catalogues - WFS | Copy link | N/A |
LIDAR Composite First Return Digital Survey Model (FZ_DSM) - 1m - WCS | Copy link | N/A |
LIDAR Composite First Return Digital Survey Model (FZ_DSM) - 1m - WMTS | Copy link | N/A |
OGC API - Features service | Copy link | Open link |
Full downloads and supporting documentation | Format | Action |
---|---|---|
LIDAR Composite Technical Information Guide.docx | DOCX | Download |