Raster Results Processing QGIS Plugin

Plugin to process hydraulic model results rasters - set (currently only one) of tools to make it easier to create

• Impact Rasters

Tools are primarily designed to work with TUFLOW outputs

Impact Raster Creator

Tool that takes a Changed scenario and matches it to a Baseline scenario raster for the same event and calculates a grid of change in water level and/or change in extents

Tool takes advantage of tasks in QGIS 3 to enable multi-thread background processing to speed up creation of impact rasters for multiple events and/or scenarios

• On launching the tool identifies all loaded max water level rasters (h_Max), and attempts to identify a baseline file

• User can select which file to use an example baseline instead

• User then provides all event identifiers used in the file naming convention (~eN~)

• All other baseline results will be identified from this

• Output location can be specified; By default the location is two levels above the baseline water level grid, in a folder called Impact

  • /Results
    • /Raw
      • /Model_Base_XXXX_v001
        • /grids
          • Model_Base_XXXX_v001_h_Max.asc
    • /Impact

• Naming convention follows:

  • PREFIX_[CHANGED]-[BASELINE]_EVENT_OP
    • PREFIX is the common element from both files
    • CHANGED is the details from changed after the prefix (excluding _h_Max)
    • BASELINE is the details from BASELINE after the prefix (excluding _h_Max)
    • EVENT is the events
    • OP is the output generated
  • Example
    • Baseline
      • Model_Base_XXXX_v001_h_Max
    • Changed
      • Model_Changed_XXXX_v001_h_Max
    • Output
      • Model_[Changed_XXXX_v001]-[Base_XXXX_v001]_XXXX_dh

• Outputs available are:

  • _dh
    • Change in water level between Changed and Baseline (no output in locations where either has no flooding)
    • Positive values indicate higher water level in the Changed scenario
  • _dx
    • Change in extents between Changed and Baseline (no output in locations where both have flooding or no flooding)
    • +99 indicates flooding only in the changed scenario; -99 indicates flooding only in the baseline scenario
  • _dh_dx
    • Combination of the above two outputs

• Outputs are in GeoTIFF format, in the projects projection

• The user can then select which outputs they wish to create; by default all outputs not currently in the workspace are selected for creation