| Getmapping height data |
This is derived from our own digital aerial photography and the result of a DTI
funded Knowledge Transfer Project between Getmapping, Bath Spa University,
GeoSense and SCS. The partnership seeks to create an enhanced Digital Elevation
Model (eDEM) of the whole of the Britain using workflows and algorithms, which
require little if any human interaction. Significantly the data is produced at
a 1 metre posting. The result is probably the best balance between cost and
accuracy currently available with the significant added bonus of nationwide
coverage, which is not available for LiDAR. For practical comparison the
Getmapping height data is within a few centimetres of LiDAR in open areas but
is actually better than LiDAR when it comes to building heights, which are the
result of photogrammetry.
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The availability of matching co-registered aerial photography provides working
‘intelligence’ and the ability to create 3D environments for further
investigation or display.
Getmapping height data is available as a Digital Surface Model (DSM), Digital
Terrain Model (DTM) and contours.
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1m posting DTM and DSM.
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5m contours.
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Horizontal accuracy 40cm RMSE.
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Vertical accuracy 50cm RMSE.
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Call us on +44 (0)1252 845 444
e-mail us at: sales@getmapping.com
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| Getmapping digital surface model (DSM) |
The first surface model is produced using the digital stereo aerial photography
acquired by Getmapping. The data is acquired and processed independent of any
OS datasets and is therefore free from any third party copyright. The process
takes advantage of semi-automatic algorithms and the superior quality of the
digital camera technology to produce a clean first surface model. This requires
only minimal manual editing to remove gross errors. The result is a DSM with a
1m posting and a vertical accuracy RMSE of up to 40cm with sub-pixel horizontal
accuracy. For practical comparison the accuracy of ‘heighting’ in open areas is
directly comparable with LiDAR.
Call us on +44 (0)1252 845 444
e-mail us at: sales@getmapping.com
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| Getmapping digital terrain model (DTM) |
The DSM is edited to produce the 1m DTM product. Getmapping uses a suite of
algorithms to semi-automatically edit the DSM and remove unwanted surface
features. These algorithms include a routine, which reduces the woodland canopy
areas based on a bounding polygon. This requires some manual intervention to
create bounding polygons for woodland extents. In addition, break lines are
captured where required to ensure true terrain features are not removed and
that bodies of water, such as lakes, remain flat. The result is a 1m posted DTM
with a vertical accuracy of up to 50cm RMSE.
Call us on +44 (0)1252 845 444
e-mail us at: sales@getmapping.com
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| NEXTMap digital terrain model |
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The digital terrain model provides an accurate, high density and complete
height dataset covering Great Britain. More commonly known as a "Bald Earth"
model, the data removes all trees, buildings and other man-made structures to
leave the underlying terrain height information. The DTM was created from the
NEXTMap Britain™ survey.
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Product highlights
• Countrywide coverage.
More info on coverage
• Available at a 5m and 10m posting.
• Surveyed in 2002 / 2003.
• Available in a variety of formats.
• Rolling program of updates.
• Supplied with geo-positioning information.
• Free GIS software package.
• Ready to import into CAD/GIS or other software packages.
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Search for a digital terrain model |
NEXTMap digital surface model |
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This dataset provides the only accurate, high density and complete digital
surface model covering Great Britain. More commonly known as a "Canopy Model"
model, the data includes surface features such as trees and buildings and was
created from the NEXTMap Britain™ survey. The DSM is ideal for applications
such as radio signal propagation analysis, noise and wind modelling or in
combination with aerial photography to create 3D landscapes.
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Product highlights
• Countrywide coverage.
More info on coverage
• Available at a 5m posting.
• Surveyed in 2002 / 2003.
• Available in a variety of formats.
• Rolling program of updates.
• Supplied with geo-positioning information.
• Free GIS software package.
• Ready to import into CAD/GIS or other software packages.
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Search for a digital surface model |
NEXTMap digital contours |
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An accurate, high density complete contour dataset created from the NEXTMap
Britain™ survey. Covering England, Scotland and Wales, the data was acquired
during 2002/2003 and is available in 5m contour intervals.
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Product highlights
• Countrywide coverage.
More info on coverage
• 5m contour intervals.
• Surveyed in 2002 / 2003.
• Available in a variety of formats.
• Rolling program of updates.
• Supplied with geo-positioning information.
• Free viewer.
• Ready to import into CAD/GIS or other software packages
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Search for digital contours |
Cities Revealed LiDAR |
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LiDAR has revolutionised the acquisition of digital eleveation data and has
quickly become a de facto method of collecting height and surface information
for a myriad of applications and analysis. There is no other method that can
collect ground and surface height information as quickly, accurately and as
cost-effectively. These factors make LiDAR a highly viable option for all
application that require height, volume or 3D visualisation information.
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Product highlights
• Collected by a laser at intervals of between 1m and 2m on the ground and
vertical accuracy of each height point is +/- 15cm.
• Referenced to the National Grid system allowing to be easily integrated with
other geographic databases and Ordnance Survey Mapping.
• Available in a variety of formats.
• Extensive coverage of UK urban areas available.More
info on coverage
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Search for Cities Revealed LiDAR |
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