[GRASS-user] river and dams in netwok analysis

[Helmut Kudrnovsky]

Etienne DELAY (deust 2010) wrote
> Dear all dear Markus,
> Above all great job GRASS dev team ! Grass 7 is so nice and powerful. 
> I'm always in the dark with my dams problem.
> 
> I would like to export dams points as node and for each node in the 
> attribute table 2 new column : dam before | dam after. I'm looking for 
> network analysis but it may be a wrong way ?
> 
> There is a way to do that in Grass?
> 
> 
> Cordialement
> 
> Etienne DELAY (Skype : etienne.delay.tic)
> Chaire: Capital environnemental et gestion durable des cours d'eau
> laboratoire GEOLAB UMR 6042 CNRS
> Université de Limoges, FLSH
> 39E rue Camille Guérin 87036 Limoges
> blog : http://elcep.legtux.org
> 
> Le 18/10/2015 17:30, Markus Neteler a écrit :
>> On Sat, Oct 17, 2015 at 11:17 AM, Etienne DELAY
>> <

> etienne.delay at .unilim

>  <mailto:

> etienne.delay at .unilim

> >> wrote:
>>  > Re,
>>  > I have read carefully the v.out.ogr as will said for tring to export
>> the
>>  > network layer but I've got an error :
>>  >
>>  > v.out.ogr --overwrite input=network at PERMANENT type=point dsn=~/
>> layer=2
>>  > format=ESRI_Shapefile
>>  >
>>  > WARNING: 111738 line(s) found, but not requested to be exported.
>> Verify
>>  >          'type' parameter.
>> ...
>>
>> (I guess that you need to set "type=line" and not "type=point")
>>
>> ... this is why you may consider to upgrade to the current 7.0.x stable
>> version. Note the differences:
>>
>> https://grass.osgeo.org/grass64/manuals/v.out.ogr.html
>> type=string[,string,...] Feature type(s).
>>    Combinations not supported by all output formats. Default: first type
>> found in input.
>>    Options: point,line,boundary,centroid,area,face,kernel,auto
>>    Default: line,boundary
>>
>> https://grass.osgeo.org/grass70/manuals/v.out.ogr.html
>> type=string[,string,...] Feature type(s)
>>    Combination of types is not supported by all output formats.
>>    Default is to use first type found in input vector map.
>>    Options: point, line, boundary, centroid, area, face, kernel, auto
>>    Default: auto  <<==
>>
>> Less to think about, much faster vector data processing, improved
>> network analysis along with new graphical frontend:
>> https://grasswiki.osgeo.org/wiki/Vector_network_analysis#Screenshots
>>
>> Best
>> Markus
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Have a look at 

https://grass.osgeo.org/grass71/manuals/lrs.html

and v.lrs.where 





-----
best regards
Helmut
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