Center for Spatial Information Science and Systems (CSISS)
CSISS Geospatial Web Services index

Raster_StreamExtractionService

Operation:

flowDirectionBasedMethod_GRASS - Derive stream network from DEM based on flow direction. Uses r.watershed hydrological module in GRASS GIS software to compute flow accumulation, select a treshold to extract stream network from the accumulation.

Request Parameters:

sourceURL
URL of input elevation file
Default format: GeoTIFF
flowaccum_threshold
threshold flow accumulation
Parameter format: integer
outputFormatType
Format of output file
Parameter format: string
Options: GeoTIFF,TIFF,ESRI_Shapefile
Default: GeoTIFF
outputGeoTiffType
Type of output GeoTIFF file if outputFormatType is specified as GeoTIFF
Parameter format: string
Options: Byte,Int16,UInt16,UInt32,Int32,Float32,Float64,CInt16,CInt32,CFloat32,CFloat64
Default: Byte

Response Parameters:

returnURL
URL of output file to contain stream segments
returnFormat
Format of output file

See also GRASS command

r.watershed


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