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The combination of point rainfall stations and weights to compute the areal rainfall are stored in the database to be used at a later stage for different time periods.
Series
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Codes
Area Series can be selected by selecting a series in the series list box and pressing the Select button. Point Series are selected by selecting a series in the series list box and pressing the '>>' button. To deselect a point series, select the series in the spreadsheet and press '<<'. By selecting more series at a time, multiple series can be added to the point series list box. By clicking your right mouse button on top of the Series list box you can select or de-select all series.
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The Catchment listbox contains all catchments in the database. A catchment can be selected by clicking on the catchment name in the list box. The Reference co-ordinates in latitude/longitude co-ordinates are given in the appropriate boxes.
The co-ordinates of the catchment will be used in the computation, make sure the selected catchment has co-ordinates stored in the database. A maximum of 10.000 co-ordinate points can be used in the computation.
Projection of
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Map-layer
When executing the Thiessen function a choice must be made to make a Thiessen polygon in local meter co-ordinates or Latitude/Longitude co-ordinates. If your background map is in a local meter co-ordinate system make sure the Local meter co-ordinate system option button is selected.
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