SDC Sphy Manual
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  • manual
    • SPHY Manual
      • 1. Introduction
      • 2. Theory
        • 2.1 Background
        • Modules
        • Reference and potential evaporation
        • Dynamic vegetation processes
        • Snow processes
        • Glacier processes
        • Soil water processes
        • Soil erosion processes
        • Routing
      • 3. Applications
        • Irrigation management in lowland areas
        • Snow- and glacier-fed river basins
        • Flow forecasting
      • 4. Installation of SPHY
      • 5. SPHY model GUI
        • 5.1 Map canvas layers and GUI interactions
        • 5.2 Top menu buttons
        • 5.3 General settings
        • 5.4 Climate
        • 5.5 Soils
        • 5.6 Groundwater
        • 5.7 Land use
        • 5.8 Glaciers
        • 5.9 Snow
        • 5.10 Routing
        • 5.11 Report options
        • 5.12 Running the model
        • 5.13 Visualizing model output
      • 6. SPHY model preprocessor v1.0
        • 6.1 Overview
        • 6.2 General settings
        • 6.3 Area selection
        • 6.4 Modules
        • 6.5 Basin delineation
        • 6.6 Stations
        • 5.7 Meteorological forcing
      • 7. Build your own SPHY-model
        • Select projection extent and resolution
        • Clone map
        • DEM and Slope
        • Delineate catchment and create local drain direction map
        • Preparing stations map and sub-basins map
        • Glacier fraction map
        • Soil hydraulic properties
        • Other static input maps
        • Meteorological forcing map series
        • Open water evaporation
        • Soil erosion model input
        • Sediment transport
        • Reporting
      • Appendix 1: Input and Output
      • Appendix 2: Hindu Kush-Himalaya database
      • References
      • Copyright
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  3. 6. SPHY model preprocessor v1.0

6.3 Area selection

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Last updated 1 year ago

After completing the General settings, you can go to the Area selection tab (Figure 60). This part of the GUI is the most important, since here you define the extent and spatial resolution of your area of interest. If no area has been selected before, then your GUI looks like Figure 60. Now it is time to select your area of interest by dragging a rectangle. For better orientation it is possible to show the standard background layer by checking the Show background layers checkbox (Figure 61). This background layer contains the Countries and Shaded Relief layers from the Natural Earth dataset*. Of course you can add your own background dataset for better orientation.

*http://www.naturalearthdata.com/downloads

Select you area of interest by clicking the Click to select area button. This will temporarily hide the GUI which allows you to drag a rectangle. After you have dragged a rectangle for your area of interest, a red rectangle is shown and the GUI is shown again with the Area properties being filled in (Figure 62). If your selected area is too large in combination with the model resolution, then a warning will appear that hints for choosing a coarser spatial resolution.

You can change the model resolution under Set spatial resolution [m]. Each time you change the value in this box you need to click the Re-calculate area properties button. If you are happy with the selected area and its properties, then finish this step by clicking the Create model clone button. After finalizing this step your GUI may look something like Figure 63.

You can always go back to this tab of the GUI later on if you’re unsatisfied with the result and want to reselect or fine-tune your area of interest.

Figure 60: Overview of the Area selection tab.
Figure 61: Showing the standard background layer
Figure 62: Selecting your area of interest.
Figure 63: Finalizing the Area selection tab.