If the source data for the analysis is in the form of an external DEM, this information can either be imported ( Create DEM > Import DEM) or sampled (reading point elevation from the DEM to populate the elevation of blank pixels in a user-defined DEM)( Create DEM > Raster DEM). Watercourse data need only be in 2D, that is, non-visual data is not required ( GIS > Streams). Importing contour data requires GIS files containing line or polyline contours with non-visual data attached that contains elevation information ( GIS > Contours). Sampling of ARC-INFO ASCII NET and 12d TIN (.12da) files is also supported.ĭata can also be downloaded from various online data sources. If the DEM is being imported or sampled, then a wide range of raster formats can be utilised. If the DEM is to be interpolated from contour and watercourse data then this data may be imported as: The next stage in building a CatchmentSIM project is to import suitable GIS data from a number of supported data formats.
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