Hi GRASS users, maybe someone of you can explain me following problem (of understanding) I am facing: I want to break a single line into several. More specifically, I am using v.edit with the option break and two coordinate pairs to break a single line. I'd expect that breaking a single line at two points would result in three lines; However this results in 4 categories?!
Here a small example using the NC dataset: ################################# # Extract single line for testing v.extract --o input=streams@PERMANENT cats=92551 output=selected_stream # Break line at two point locations and clean (recommended after v.edit break) v.edit map=selected_stream tool=break threshold=30 coords='635861,224469,635793,224553' v.clean --o input=selected_stream output=selected_stream2 tool=rmdupl # Add categories to layer 2 to check v.category --o input=selected_stream2 layer=2 output=selected_stream3 option=add v.db.addtable map=selected_stream3 layer=2 d.vect -c map=selected_stream3@test4 layer=2 label_layer=2 attribute_column=cat #################################### So the display shows three colors which makes sense as these would be the three lines that I'd expect from breaking a single line at two points. But there are four categories (that are also listed in the attribute table). Can anyone explain that to me, what I am doing wrong; or even better, what would you recommend to do if I want to break a line at two coordinates into three lines? Thank you for your help! Johannes
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