[GRASSLIST:2013] Re: input format of v.net.path in GRASS5.7

[Hayashi Shin-ichiro]

Dear GRASS users:
 
Thank you very much for your advise, Radim.

I tried 
$ v.net input=walk output=walk_ca 
1)My question 
1. does v.net give category for all arc and node?
2. Is category number which 1 is arc and 2 is node?

I executed v.net.path. Command worked but didn't make any shortest path.
$ echo "1 5" |v.net.path input=walk_ca output=walkpath
Error messege 
WARNING: 54667 points without category.
WARNING: No point with category 1
WARNING: No point with category 5 

And I tried 
$ v.category in=walk out=walk_ca option=add 
I have same question.  
1. does v.category give category for all arc and node?
2. Is category number which 1 is arc and 2 is node?

Then I executed v.net.path. Command worked but didn't make any shortest path.
GRASS gives me same error messege.

I execute d.what.rast. But command tell me only infomation about arc.
2)My question 
What way can I get infomation about node? 

My big question is
What way can I give category number for node?

Please give me your suggestion.
Thank you in advance.
Sincerely yours.

>Nodes on the network are identified by category number of points
>placed exactly on network nodes (ends of lines). If you have lines
>only in you vector, you can add new points by v.net and assign categories 
>to points by v.category field=2. Then use these categories as input for v.net:
>echo "1 5" | v.net.path
>
>
>Radim
>

----
Hayashi Shin-ichiro  
mail:forest at bres.tsukuba.ac.jp URL:http://ryuiki.agbi.tsukuba.ac.jp/~forest
Watershed Management Lab., University of TSUKUBA