Dear List,
I use GRASS GIS 7.4 to calculate traveling distances using v.net.iso based on OSM data. I used v.clean to basically clean the data.
If I run an analysis based for distances I get an result, but using costs in terms of traveling time it fails. I do not get cat values for the classes I defined. These are my GRASS GIS queries:
For Distances:
----------------
v.net.iso input=strassen_net output=strassen_net_iso center_cats=1 costs=1000,2000,5000 --o
For traveling time: the column acost / bcost = values in minutes
----------------
v.net.iso input=strassen_net output=strassen_cost_iso arc_column=acost center_cats=1 costs=10,20,30 --o
What could be the problem? The processing log says, that one entry in the database for a line could not be found. However, the same network works for distances.
Thanks and kind regards,
Klaus
Am 2. November 2018 10:13:10 MEZ schrieb Mithoefer <mithoefer@gbd-consult.de>:
Dear List,
I use GRASS GIS 7.4 to calculate traveling distances using v.net.iso
based on OSM data. I used v.clean to basically clean the data.
If I run an analysis based for distances I get an result, but using
costs in terms of traveling time it fails. I do not get cat values for
the classes I defined. These are my GRASS GIS queries:
For Distances:
----------------
v.net.iso input=strassen_net output=strassen_net_iso center_cats=1
costs=1000,2000,5000 --o
For traveling time: the column acost / bcost = values in minutes
----------------
v.net.iso input=strassen_net output=strassen_cost_iso arc_column=acost
center_cats=1 costs=10,20,30 --o
What could be the problem? The processing log says, that one entry in
the database for a line could not be found. However, the same network
works for distances.
AFAIK, the module does not use the attribute table when calculating distance, so if there is a problem with the attribute data, might only show in the second case.
Please send us the log. And ideally also the definition and a few examples lines of the attribute table.
Moritz