[GRASS-user] v.net.iso calculation based on traveling time fails

[Moritz Lennert]

Am 2. November 2018 10:13:10 MEZ schrieb Mithoefer <mithoefer at 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