Identification

Title

LIDAR DTM Time Stamped Tiles

Alternative title(s)

Abstract

The LIDAR DTM (Digital Terrain Model) Time Stamped Tiles product is an archive of raster elevation data produced by the Environment Agency. Site specific LIDAR surveys have been carried out across England since 1998, with certain areas, such as the coastal zone, being surveyed multiple times. Data is available at varying resolutions of 25cm, 50cm, 1m and 2m, depending on project requirements. 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 GeoTiff rasters in 5km zipfiles, data is presented in metres, referenced to Ordnance Survey Newlyn and data aligned to the OS Grid. All LIDAR data has a vertical accuracy of +/-15cm RMSE. The transformation used on the data is specific to the time period of survey. You can also download survey index files which show, for any location, what Time Stamped data is available, the specific dates of survey, resolution of product and what transformation and geoidal model used. 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 elevation models to be generated at spatial resolutions of between 25cm and 2 metres. This metadata record is for Approval for Access product AfA457. Attribution statement: © Environment Agency copyright and/or database right 2020. All rights reserved.

Resource type

dataset

Resource locator

https://environment.data.gov.uk/DefraDataDownload/?Mode=survey

protocol: DSP:ESRI

name: Survey_Download

description: Survey Download

https://environment.data.gov.uk/DefraDataDownload/?mapService=EA/SurveyIndexFiles&Mode=spatial

protocol: DSP:ESRI

name: Metadata Shapefile Index Catalogues - Download

description: Download the coverage metadata files

https://environment.data.gov.uk/spatialdata/survey-index-files/wms

protocol: OGC:WMS

name: Metadata Index Catalogues - WMS

description: Coverage metadata files - Web Map Service

https://environment.data.gov.uk/spatialdata/survey-index-files/wfs

protocol: OGC:WFS

name: Metadata Index Catalogues - WFS

description: Coverage metadata files - Web Feature Service

https://environment.data.gov.uk/datafiles/2112b8cec0e545ed8a3354394f4cd0a8

protocol: WWW:LINK-1.0-http--link

name: Z_Difference_Grid_for_adjusting_data_between_OSTN02_and_OSTN15.

description: Z Difference Grid for adjusting data between OSTN02 and OSTN15.

https://support.environment.data.gov.uk/hc/en-gb/sections/360001747351-Survey-Data-Catalogue

protocol: http:

name: Survey_Data_FAQs

description: Survey Data Catalogue FAQs

Unique resource identifier

code

e0c64fdb-2502-4efd-b98b-243f70d8e53e

codeSpace

Dataset language

eng

Spatial reference system

code identifying the spatial reference system

http://www.opengis.net/def/crs/EPSG/0/27700

Classification of spatial data and services

Topic category

environment

elevation

Keywords

Keyword set

keyword value

OpenData

Elevation

Mapping

LIDAR

Keyword set

keyword value

flood

mapping

GIS digital format

remote sensing

originating controlled vocabulary

title

GEMET - Concepts, version 2.4

reference date

date type

publication

effective date

2010-01-13

Geographic location

West bounding longitude

-5.7

East bounding longitude

1.8

North bounding latitude

55.8

South bounding latitude

50

Extent

Extent group

authority code

code identifying the extent

http://data.ordnancesurvey.co.uk/doc/country/england

Temporal reference

Temporal extent

Begin position

1996-12-01

End position

2021-01-31

Dataset reference date

date type

creation

effective date

1998-01-10

date type

revision

effective date

2021-03-01

Frequency of update

quarterly

Quality and validity

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.

Conformity

Data format

name of format

Open format | Geo Tagged Image File Format (GeoTIFF)

version of format

Constraints related to access and use

Constraint set

Use constraints

Open Government Licence

Constraint set

Limitations on public access

There are no public access constraints to this data. Use of this data is subject to the licence identified.

Responsible organisations

Responsible party

organisation name

Environment Agency

email address

DSPcustomerforum@environment-agency.gov.uk

web address

https://support.environment.data.gov.uk/hc/en-gb

description: Defra Data Services Forum

responsible party role

pointOfContact

Metadata on metadata

Metadata point of contact

organisation name

Environment Agency

email address

metadata@environment-agency.gov.uk

responsible party role

pointOfContact

Metadata date

2022-03-21

Metadata language

eng