Height Data Suppliers | CentremapsLive

Features and benefits
Perfect for
Usable formats
Key Points
Samples

Features and benefits

Our height data and LiDAR products for site landscape and topography add up to the most comprehensive online range in terms of detail and coverage.

Easy to work with, the data can be brought into CAD and GIS software to enable 3D analysis and provide important contextual information for a range of applications.

Usable formats

Supplier	Dataset Name	Resolution	Vertical Accuracy	Coverage	DTM or DSM	Data Collection Method
Environment Agency	EA LiDAR	2m-0.25m	+/- 15cm	Coastal, flood risk and urban centres	Both	LiDAR and photogrammetry
Ordnance Survey	OS Terrain 5	5m	+/- 1.5m Urban, +/- 2.5m Rural	GB	DTM	Photogrammetry, topographical survey
Ordnance Survey	OS Terrain 50	50m	+/- 4m	GB	DTM	Photogrammetry, topographical survey
Intermap	Nextmap	5m	+/- 1m	GB	Both	IFSAR
LPS	LPS OS NI	10m	+/- 1m	NI	DTM	Photogrammetry
Airbus Defence & Space	Astrium LiDAR	2m - 0.5m	+/- 15cm	100+ GB urban areas	Both	LiDAR
Blom	?	Up to 0.25m	+/- 15cm	London	Both	LiDAR
Cities Revealed	?	2m or 1m	+/- 15cm	Numerous urban centres and environs	Both	LiDAR

DSM and DTM

Digital Surface Models (DSMs) provide a topographic model of the earth's surface. They measure the height values of the first surface on the ground as seen from above, including terrain features, buildings, vegetation and power lines.

Digital Terrain Models (DTMs) provide a topographic model of the bare earth / underlying terrain of the earth's surface and are usually derived from DSMs by digitally removing the man-made and vegetation features. The stated accuracy of a DTM will therefore usually be slightly lower than that of the DSM it's derived from, particularly in areas of continuous and dense building and tree coverage.

Perfect for

Terrain modelling and visualisation
Site analysis and planning
Flood modelling
Cut and fill analysis
Line of sight analysis
Drainage analysis
Environmental impact assessment
Landscape visualisation
Radio wave propagation
Utilities and management
Noise and pollution modelling
View shed analysis

Usable formats

We can supply the data in six main formats, and you'll need CAD or GIS software to open and use it:

DXF Format Points CAD
ASCII Grid for GIS
DXF 3D Face CAD
XYZ – easting, northing, height CAD/GIS
Erdas Imagine image file GIS
Contours – DXF files for CAD/GIS

In most cases an Ordnance Survey-based map or aerial imagery will be needed in order to relate the height information to geographic and topographical features.

When opened in CAD/GIS, all formats are geo-referenced with an x, y location (eastings, northings on the Ordnance Survey National Grid) making it very easy to precisely overlay height data with OS mapping products. In CAD, an insertion point of 0,0 will need to be specified if prompted by the software.

We can also supply various other formats of height data on request - please contact us for details.

Key Points

Extensive range of formats to suit a huge variety of software and applications
Vast spread of resolutions to meet any needs, from contextual overviews to advanced 3D analysis
Full product support available from our experienced technical team