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Spatial Data DSM Generator.rst

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Spatial Data: DSM Generator

* Developer: .. list-table:: :widths: 50 50 :header-rows: 1

    • Name
    • Institution
    • Nils Wallenberg
    • Gothenburg
  • Introduction:

    Digital Surface Models (DSMs) is not always available for the area you want to investigate. The DSM Generator can be used to create or alter a DSM by using information from a polygon building footprint layer where a building height attribute is available. An option to acquire building footprints, and also in some cases building height from Open Street Map data, is available from this plugin.

  • Dialog box
    Dialog for the DSM generator pluginDialog for the DSM generator plugin

* Dialog sections: .. list-table:: :widths: 30 70 :header-rows: 0

    • top
    • input DEM data is specified
    • middle upper
    • input polygon with height data or OSM is specified
    • middle
    • map extent is specified
    • middle lower
    • to specify the output DSM and output resolution
    • bottom
    • to run the calculations
  • Digital Elevation Model:

    A raster file containing elevation values needed to create the DSM. Raster elevation data (DEM) can be retrieved from e.g. OpenDEM.

  • Polygon Vector File:

    A polygon vector file including height values of buildings needed to create the DSM.

  • Necessary attributes:

    Building height values in meters.

  • Use Open Street Map:

    Tick this in if you do not have a polygon layer with building heights. Open Street Map (© OpenStreetMap contributors) data will be used instead. If no building height is found building level height will be used instead. Set to appropriate value, e.g. a three level building with building level height set to 3 will be 3 * 3 = 9 meters high.

  • Save OSM as shapefile:

    Tick this in if you want to save the Open Street Map data as a polygon layer. This can be used if you want to look at what values has been used and if you want to add values manually.

  • Map extent:

    Set either to map canvas extent or extent from layer. Extent have to be smaller or equal to the raster DEM extent specified in the top section.

  • Digital Surface Model:

    Set output for the generated DSM. Also set output resolution.

  • Run:

    Starts the calculations.

  • Close:

    Closes the plugin.

  • Output:

    One GeoTIFF is created, a DSM.

  • Remarks:
    • The DEM raster and map canvas should be in a projection with meters as units.
    • Raster elevation data (DEM) can be retrieved from e.g. OpenDEM.
    • If you use Open Street Map make sure you read Open Street Map © OpenStreetMap contributors.