Preface bottom content

How is Digital Terrain Mode (DTM) Height Data produced?

Support Category: 
  • The DSM is edited to produce a 5m DTM product
  • Getmapping uses a suite of algorithms to semi-automatically edit the DSM and remove unwanted surface features such as buildings and vegetation
  • 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 and identify true ground level
  • 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 5m posted DTM with a vertical accuracy of less than 60cm RMSE

Call to action content

Need help with our products or services? Call 01252 849440 or

Contact Sales

Trim content

© Copyright Getmapping  2022