See Analysis environments and Spatial Analyst for additional details on the geoprocessing environments that apply to this tool. D8 flow directions can be created using the Flow Direction tool, run with default flow direction type D8. The Stream Order tool only supports a D8 input flow direction raster. The resulting stream network can be used in Stream Link and Stream to Feature.Īn analytical method for determining an appropriate threshold value for stream network delineation is presented in Tarboton, et al. Use the Con or Set Null tool to create a stream network raster in which flow accumulation values of 100 or greater go to 1 and the remainder are put to the background (NoData). For example, cells that have more than 100 cells flowing into them are used to define the stream network. The results of the Flow Accumulation tool can be used to create a raster stream network by applying a threshold value to select cells with a high accumulated flow. If the stream raster is derived from a rasterized streams dataset, the output may not be usable because, on a cell-by-cell basis, the direction will not correspond with the location of stream cells. The output of Stream Order will be of higher quality if the input stream raster and input flow direction raster are derived from the same surface.
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