- Survey Data Catalogue - accessing the current LiDAR capture programme
- Survey Data Catalogue - ASCII to GeoTiffs
- Survey Data Catalogue - downloading large areas of LiDAR data
- Survey Data Catalogue - Environment Agency data coverage
- Survey Data Catalogue - finding available data in my Area of Interest (AOI)
- Survey Data Catalogue - LiDAR Composite and SurfZone DEM Survey download zip files are no longer available as a Shapefile
- Survey Data Catalogue - LiDAR data metadata
- Survey Data Catalogue - LiDAR data survey schedule
- Survey Data Catalogue - opening and using downloaded LiDAR files
- Survey Data Catalogue - point density considered in the LiDAR programme
- Survey Data Catalogue - projection information
- Survey Data Catalogue - Scottish LiDAR data
- Survey Data Catalogue - vertical accuracy of the LiDAR data
- Survey Data Catalogue - where to view and download metadata for all LiDAR products
- Survey Data Catalogue - where to view LiDAR data
Survey Data Catalogue - ASCII to GeoTiffs
Created: 09 June 2020 Updated: 31 May 2023
We have just released our latest 1 m and 2 m DTM Composite products on the Defra Data Services Platform (DSP). This includes the best available surveys captured before October 2019. With the 2019 release we have changed our data format from ASCII to GeoTiffs. These GeoTIff files are supplied in 5 km tiles with elevations in metres. GeoTIFF is a modern Geographical Information Systems (GIS) format widely used for delivering elevation data and was chosen due to its open standards and highly efficient data storage. Data volumes are on average 5x smaller, enabling faster download over internet and more manageable storage. Storing the data in GeoTiff also enables us to start to deliver more services over the web such as Image Services and WCS services. These services provide APIs for users view the data directly in a browser, or bring the data directly into desktop GIS and perform geoprocessing analysis on it. The old ASCII format meant we were limited to what we could offer. Moving to GeoTiff format also aligns the Composite product to our National LiDAR Programme products.
The vast majority of software’s including QGIS, ArcGIS, GRASS & AutoCAD Civil3D are able to open a GeoTiff file in the same way as the previous ASCII file. If you do experience any issues we have put together some links on converting between file formats on the Blogs and Guides section of our Remote Sensing & Surveying in the Environment Agency. This is a straightforward conversion process in GIS software.