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The export option "Riemann boundary calculation constants" in the F12 menu is a configuration aid for the Riemann boundary transformation. Given a coarse and a fine grid (both already configured in Grids.xml), and a location set of boundary locations (already configured in LocationSets.xml), FEWS will calculate the constants, such as weights and angles, necessary to perform the Riemann boundary transformation to interpolate a time series from the coarse grid to the given boundary locations. The calculated constants will be exported to several csv CSV files, which can then be used to configure the necessary location attributes for the transformation.
Running the Calculation
When the option is selected in the F12 menu, a menu in which the input grids and location set can be selected will appear. This menu will contain drop-down menus for the fine grid, coarse grid and boundary location set. Note that only regular, rectangular or quadrilateral grids which are not time-dependent will appear as an option for both the fine grid and the coarse grid. As indicated by their names, cells of the fine grid should be smaller then cells of the coarse grid. In the location set drop-down menu, only location sets which are not time-dependent will appear. Finally, a check-box can be selected if the coarse grid should be considered staggered. In this case the weights for u vectors, v vectors and time series located at the center point of the grid cell are calculated separately to reflect the different positions at which they are located:
After confirming the input options, a second menu will appear to select the output directory. Note that this directory should be empty.
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