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

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  • 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

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