Hi, Jarek: >> the mentionned "real" mainchannel is the part of real Austrian river >> network >> (i.e. listed in the annual Austrian hydrographical handbook as the river >> 'Isel') >It is popular argument against algorithmic approach. Usually computer >algorithms cannot reproduce arbitrary human decisions :-(
Markus M: >As Jarek said, there is nothing like the one and only "real" >mainchannel because there a different definitions on how to determine >the main channel. You would need to get the definition of "real >mainchannel" out of the Austrian hydrographical handbook, in this example it's based on hydrographical characteristics: - the "real" mainchannel (river Isel) has an (nival)/gacial runoff regime - the calculated mainchannel (river Schwarzach) has an nival runoff regime, and flows into the river Isel Jarek, Markus M, thanks a lot for the insight! best regards Helmut ----- best regards Helmut -- View this message in context: http://osgeo-org.1560.n6.nabble.com/GRASS-GIS-1577-r-stream-extract-r-stream-order-calculated-mainchannel-vs-real-mainchannel-tp4473866p4475056.html Sent from the Grass - Dev mailing list archive at Nabble.com. _______________________________________________ grass-dev mailing list [email protected] http://lists.osgeo.org/mailman/listinfo/grass-dev
