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How is Digital Surface Model (DSM) Height Data produced?

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  • 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 and to accurately map the drainage network
  • The result is a DSM with a 2m posting and a vertical accuracy RMSE of around 50cm, with sub-pixel horizontal accuracy
  • For practical comparison, the accuracy of our data in open areas is directly comparable with LiDAR

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