The EU-DEM dataset is a realisation of the Copernicus programme, managed by the European Commission, DG Enterprise and Industry. This dataset reflects the Digital Terrain Model (DTM). an accuracy of 1.0m RMSE (root means square error) - 65 per cent of data has an accuracy of 1.0m, 90 per cent has an accuracy of 2.0m, and 99 per cent of the data has an accuracy of 3. The Digital Elevation Model over Europe from the GMES RDA project (EU-DEM) is a Digital Surface Model (DSM) representing the first surface as illuminated by the sensors. The 25 cm resolution data covers approximately 200 km of the main settlement areas, including Stornoway.all height measurements in metres mean above sea level at Belfast Lough.60m point spacing with break-lines for notable changes in slope.
The enhanced DTM is created from stereo imagery in the orthophotography production process. In this lesson you will use terrain analysis tools to find out more about the study area for the proposed residential development from earlier.
#Digital terrain model uk software#
These images could be read with common FOSS GIS Software like QGIS. can be used in a GI software to create thematic maps, grids and contours 30 m Digital Surface Model (DSM) as Erdas Imagine Images (.img).using Geographical Information software, orthophotographs and maps, it can be draped over a Triangular Irregular Network (TIN) derived from a DTM to create a 3D view of the land surface.suitable for digital creation of 3D mapping such as slope and aspect maps.The enhanced DTM has a point file of heights, along with break-lines showing differences in height. Updating the dataĮnhanced DTMs are updated within the same cycle as the orthophotography: Information about the enhanced DTM
An enhanced DTM provides a detailed representation of the topographical variations in the earth's surface. Break-lines show changes in slope for cliffs and road embankments. An Enhanced Digital Terrain Model (DTM) is a digital file showing break-lines and spot heights.