50m Digital Terrain Model height data

A Digital Terrain Model (DTM) is a digital file consisting of a grid of regularly spaced points of known height which when used with other digital data, such as maps or orthophotographs can provide a 3D image of the land surface.

Key features

50m regular grid
can be used in the digital creation of 3D mapping such as slope and aspect maps
using Geographical Information software, orthophotograph maps can be draped over a Triangular Irregular Network (TIN) derived from a DTM to create a 3D view of the land surface
DTM data can also be used in GIS to create thematic maps, grids and contours

Applications

planning
engineering
visualisation
height analysis
environmental impact analysis
sight lines
wind flow and pollution dispersion
soil erosion modelling
flow direction and accumulation
watershed delineation

Technical information

the DTM is created from stereo imagery in the orthophotography production process
all height measurements refer to elevation in metres above mean sea level at Belfast Lough
DTMs can be used to generate 3D TINs
the accuracy of the data is 1.0m RMSE (root mean square error)
area covered by each tile 20km x 20km
this data is now available under OSNI Open Data

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50m Digital Terrain Model height data

Key features

Applications

Technical information

Help improve this page - send your feedback

Messages

What to do next

Carer's Allowance

Discretionary support / Short-term benefit advance

Disability Living Allowance

Employment and Support Allowance

Jobseeker’s Allowance

Personal Independence Payment