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
