Difference between revisions of "Vector network analysis"
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| − | Vector network analysis | + | = Vector network analysis = |
| − | GRASS provides support for vector network analysis. The following algorithms are implemented: | + | |
| + | GRASS provides support for vector network analysis using the [http://grass.osgeo.org/dglib/ DGlib] Directed Graph Library. The following algorithms are implemented: | ||
* Vector maintenance: v.net | * Vector maintenance: v.net | ||
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* see the [http://grass.ibiblio.org/grass63/manuals/html63_user/vectorintro.html vector map processing and network analysis] help page | * see the [http://grass.ibiblio.org/grass63/manuals/html63_user/vectorintro.html vector map processing and network analysis] help page | ||
| − | = Shortest path routing = | + | |
| + | |||
| + | == Shortest path routing == | ||
* see the [http://grass.ibiblio.org/grass63/manuals/html63_user/v.net.path.html v.net.path module] and [http://grass.ibiblio.org/grass63/manuals/html63_user/d.path.html d.path] help pages | * see the [http://grass.ibiblio.org/grass63/manuals/html63_user/v.net.path.html v.net.path module] and [http://grass.ibiblio.org/grass63/manuals/html63_user/d.path.html d.path] help pages | ||
Revision as of 19:05, 12 August 2008
Vector network analysis
GRASS provides support for vector network analysis using the DGlib Directed Graph Library. The following algorithms are implemented:
- Vector maintenance: v.net
- Shortest path: d.path and v.net.path
- Traveling salesman (round trip): v.net.salesman
- Allocation of sources (create subnetworks, e.g. police station zones): v.net.alloc
- Minimum Steiner trees (star-like connections, e.g. broadband cable connections): v.net.steiner
- Iso-distances (from centers): v.net.iso
Vector directions are defined by the digitizing direction (a-->--b). Both directions are supported, network modules provide parameters to assign attribute columns to the forward and backward direction.
- see the vector map processing and network analysis help page
Shortest path routing
- see the v.net.path module and d.path help pages
New ideas
- Vector network analysis ideas (please help to realize)
Screenshots
- more screenshots from the GRASS website
v.net.iso - Split net to bands between cost isolines (direction from centre). Costs of centre node are used in calculation.
v.net.alloc - Allocates subnets for nearest centres (direction from centre). Costs of centre node are used in calculation.
d.path - Find shortest path for selected starting and ending node.
