This was generated using the Horn 3x3 (1981) method which uses the eight pixels around the central cell to calculate the weighted gradient in north-south and east-west directions, and trigonometry to calculate the maximum slope in the aspect direction. Using a smoothed digital elevation model of the earth surface, a slope product was created. * Vulnerable Lands - Steep or Highly Erodible (SHE) The Steep Land 5m product has been created to effectively replace the following existing products:
Data cleansing and quality assessments have been completed. This has been generated from a combination of 1km, 2km and 5km tiles.ĭepartment of Planning, and Environment have utilised the source data from DCS to create the Steep Land product. In 2020 Department of Customer Services (DCS) released state-wide 5m resolution digital elevation data in the form of aerial lidar and photogrammetric point-cloud. Then acquisition of satellite data enabled all of NSW to be captured, however this was coarse and mapping of steep lands remained disputable over some areas. Early designation of these areas was mapped by hand using topographic basemaps or interpreted from aerial photographs with 3D stereoscopes at various scales.
Steep Land was first acknowledged within the Soil Conservation Act 1938 legislation as Protected Lands primarily due to land degradation impacts associated with tree clearing.
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