View source for Vector network analysis/pl

= Vector network analysis =

GRASS provides support for vector network analysis using the [http://trac.osgeo.org/grass/browser/grass/trunk/lib/vector/dglib/ DGlib] Directed Graph Library.

== Zaimplementowane algorytmy ==

Poniższe algorytmy są zaimplementowane (w GRASS 6.5+):

* Utrzymanie sieci: {{cmd|v.net|version=70}}
* Najkrótsza droga: {{cmd|d.path|version=64}} and {{cmd|v.net.path|version=70}}
* Najkrótsza droga pomiędzy wieloma parami punktów {{cmd|v.net.allpairs|version=70}}
* Allocation of sources (tworzenie podsieci, np. police station zones): {{cmd|v.net.alloc|version=70}}
* Jednakowe odległości (ze środków): {{cmd|v.net.iso|version=70}}
* Computes bridges and articulation points: {{cmd|v.net.bridge|version=70}}
* Computes degree, centrality, betweeness, closeness and eigenvector centrality measures: {{cmd|v.net.centrality|version=70}}
* Computes strongly and weakly connected components: {{cmd|v.net.components|version=70}}
* Computes vertex connectivity between two sets of nodes: {{cmd|v.net.connectivity|version=70}}
* Computes shortest distance via the network between the given sets of features: {{cmd|v.net.distance|version=70}}
* Computes the maximum flow between two sets of nodes: {{cmd|v.net.flow|version=70}}
* Computes minimum spanning tree: {{cmd|v.net.spanningtree|version=70}}
* Minimum Steiner trees (star-like connections, e.g. broadband cable connections): {{cmd|v.net.steiner|version=70}}
* Znajdowanie najkrótszej drogi z użyciem rozkładów jazdy: {{cmd|v.net.timetable|version=70}}
* Traveling salesman (round trip): {{cmd|v.net.salesman|version=70}}

Vector directions are defined by the digitizing direction (a-->--b). You can navigate either omnidirectionally or differently in each directions as both directions are supported. Network modules provide parameters to assign attribute columns to the forward and backward direction. To see how a vector is directed, use the "display" parameter of  {{cmd|d.vect}} (set display=dir).

* see the {{cmd|vectorintro}} "vector map processing and network analysis" help page

== Example: Shortest path routing ==

* zobacz strony opisujące {{cmd|v.net.path}} i {{cmd|d.path}}

== Nowe pomysły ==

* [[Vector network analysis ideas]] (pomóż w realizacji)

== Zrzuty ekranu ==
* more screenshots [http://grass.osgeo.org/screenshots/vector.php from the GRASS website]


[[Image:V.net.iso.png|center|600px|thumb|{{cmd|v.net.iso}} - Split net to bands between cost isolines (direction from centre). Costs of centre node are used in calculation.]]


[[Image:V.net.alloc.png|center|600px|thumb|{{cmd|v.net.alloc}} - Allocates subnets for nearest centres (direction from centre). Costs of centre node are used in calculation.]]


[[Image:D.path.jpg|center|600px|thumb|{{cmd|d.path}} - Find shortest path for selected starting and ending node.]]

== See also ==

* [[GSoC Network Analysis]]: many new modules!

== Linki zewnętrzne ==

* [http://www.ossgis.co.cc/2009/01/grass-gis-network-analysis-subnets.html GRASS GIS: Network Analysis (Subnets within a vector network)]

[[Category:Documentation]]
[[Category:Vector]]