R.stream.* modules

Modules r.stream.order r.stream.basins, r.stream.distance and r.stream.stats are prepared to perform Hortonian analysis in GRASS GIS. Modules can work with outputs data of r.watershed and r.stream.extract being preparing by Markus Metz.

The tutorial/presentation was prepared with North Carolina Dataset.

http://grass.osgeo.org/download/data.php[1]

As a base map elev_ned_30_m was used. Regions setings for analysis:

projection: 99 (Lambert Conformal Conic) zone: 0 datum: nad83 ellipsoid: a=6378137 es=0.006694380022900787 north: 228500 south: 215000 west: 630000 east: 645000 nsres: 30 ewres: 30 rows: 450 cols: 500 cells: 225000

Because r.stream.extract is still in progress analysis will be based on r.watershed results. Stream network has been obtained with r.watershed in MFD mode: r.watershed -f elevation="elev" threshold=700 accumulation="accum" drainage="dirs" stream="streams" convergence=5

Be sure you set the region for analysis before run it.

g.region rast=elev_ned_30_m

For future analysis following map produced by r.watershed are requied: streams with streams network, dirs with flow direction and accum with flow accumulatio