Dear all, I'm running r.stream.order in order to derive strahler order with the following line: r.stream.order stream_rast=stream direction=dir elevation=elv accumulation=flow strahler=order_strahler memory=40000 The flow and the dir has been derived by r.watershed. The stream by r.stream.extract The command does not produce any error, nonetheless the final output presents some streames labeled as -1 (black color in the figure below). Reading the C code I could understand that the -1 is the initialized value for all the streams. Consider that, the -1 can happen everywhere from the 2nd order down to the 9th-order. Does anyone point to me what the problem is or where should I check it? Thanks Giuseppe
[image: image.png] -- Giuseppe Amatulli, Ph.D. Research scientist at School of the Environment Yale University New Haven, CT, USA - 06511 Tweeter: @BigDataEcology Teaching: http://spatial-ecology.net Work: https://environment.yale.edu/profile/giuseppe-amatulli/
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