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= 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.
Narzędzia GRASS do analiz sieciowych bazują na bibliotece [http://trac.osgeo.org/grass/browser/grass/trunk/lib/vector/dglib/ DGlib] Directed Graph Library.
GRASS 7 has [[WxGUI Vector Network Analysis Tool]] front-end, which supports some of the vector network analysis modules.
__TOC__
== Zaimplementowane algorytmy ==
== Zaimplementowane algorytmy ==
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Poniższe algorytmy są zaimplementowane (w GRASS 6.5+):
Poniższe algorytmy są zaimplementowane (w GRASS 6.5+):
* Utrzymanie sieci: {{cmd|v.net|version=70}}
* Utrzymanie sieci: {{cmd|v.net}}
* Najkrótsza trasa: {{cmd|d.path|version=64}} and {{cmd|v.net.path|version=70}}
* Najkrótsza trasa: {{cmd|d.path|version=64}} and {{cmd|v.net.path}}
* Najkrótsza trasa pomiędzy wszystkimi parami punktów: {{cmd|v.net.allpairs|version=70}}
* Najkrótsza trasa pomiędzy wszystkimi parami punktów: {{cmd|v.net.allpairs}}
* Wyznaczanie podsieci (tworzenie podsieci, np. police station zones): {{cmd|v.net.alloc|version=70}}
* Wyznaczanie podsieci (tworzenie podsieci, np. police station zones): {{cmd|v.net.alloc}}
* Strefy jednakowych odległości (ze środków): {{cmd|v.net.iso|version=70}}
* Strefy jednakowych odległości (ze środków): {{cmd|v.net.iso}}
* Obliczanie mostów i punktów artykulacji: {{cmd|v.net.bridge|version=70}}
* Obliczanie mostów i punktów artykulacji: {{cmd|v.net.bridge}}
* Obliczanie dobrze i słabo połączonych komponentów: {{cmd|v.net.components|version=70}}
* Obliczanie dobrze i słabo połączonych komponentów: {{cmd|v.net.components}}
* Obliczanie stopnia połączenia pomiędzy dwoma zestawami punktów: {{cmd|v.net.connectivity|version=70}}
* Obliczanie stopnia połączenia pomiędzy dwoma zestawami punktów: {{cmd|v.net.connectivity}}
* Obliczanie najkrótszej drogi w sieci pomiędzy zadanymi zestawami obiektów: {{cmd|v.net.distance|version=70}}
* Obliczanie najkrótszej drogi w sieci pomiędzy zadanymi zestawami obiektów: {{cmd|v.net.distance}}
* Obliczanie maksymalnego przepływu pomiędzy dwoma zestawami punktów: {{cmd|v.net.flow|version=70}}
* Obliczanie maksymalnego przepływu pomiędzy dwoma zestawami punktów: {{cmd|v.net.flow}}
* Obliczanie minimalnego drzewa rozpinającego: {{cmd|v.net.spanningtree|version=70}}
* Obliczanie minimalnego drzewa rozpinającego: {{cmd|v.net.spanningtree}}
* Minimalne drzewa Steinera (star-like connections, e.g. broadband cable connections): {{cmd|v.net.steiner|version=70}}
* Minimalne drzewa Steinera (star-like connections, e.g. broadband cable connections): {{cmd|v.net.steiner}}
* Znajdowanie najkrótszej drogi z użyciem rozkładów jazdy: {{cmd|v.net.timetable|version=70}}
* Znajdowanie najkrótszej drogi z użyciem rozkładów jazdy: {{cmd|v.net.timetable}}
* Analizy komiwojażera (round trip): {{cmd|v.net.salesman|version=70}}
* Analizy komiwojażera (round trip): {{cmd|v.net.salesman}}
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).
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).
Use [[Turntable]] to assign costs to turns on the network.
* see the {{cmd|vectorintro}} "vector map processing and network analysis" help page
* strona pomocy {{cmd|vectorintro}} "vector map processing and network analysis"
== Example: Shortest path routing ==
== Przykład: Najkrótsza droga ==
* zobacz strony opisujące {{cmd|v.net.path}} i {{cmd|d.path}}
* zobacz strony opisujące {{cmd|v.net.path}} i {{cmd|d.path}}
== Najważniejsze parametry ==
* '''input''' - This is the name of input vector map or data source for direct OGR access.
* '''output''' - This is the name for output vector map.
* '''type''' - This parameter defines arc type, which can be line or boundary.
* '''alayer''' - This parameter is a number and defines the arc layer. Vector features can have category values in different layers. This number determines which layer to use. When used with direct OGR access this is the layer name.
* '''nlayer''' - This parameter is a number and defines the node layer. Vector features can have category values in different layers. This number determines which layer to use. When used with direct OGR access this is the layer name.
* '''afcolumn''' - This is name of the cost column for moving in forward direction or forward and backward directions together.
* '''abcolumn''' - This is name of the cost column for moving in backward direction.
* '''ncolumn''' - This is name of the cost column for moving through nodes.
If you are not familiar with layers concept in GRASS see [[Vector Database Management]].
== Nowe pomysły ==
== Nowe pomysły ==
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* [[Vector network analysis ideas]] (pomóż w realizacji)
* [[Vector network analysis ideas]] (pomóż w realizacji)
== Zrzuty ekranu ==
=== Zrzuty ekranu z GRASS GIS 7 ===
* 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:Grass7_vector_network_tool_alloc.png|center|600px|thumb|Subsets for nearest centers ({{cmd|v.net.alloc}})]]
[[Image:wxgui-vnet-alloc.png|center|600px|thumb|Subsets for nearest centers ({{cmd|v.net.alloc}})]]
[[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.]]
Zobacz też
* [[WxGUI Vector Network Analysis Tool]]
* więcej zrzutów ekranu [https://grass.osgeo.org/screenshots/vector/ ze strony GRASS]
=== Zrzuty ekranu ze starszej wersji GRASS 5 ===
[[Image:D.path.jpg|center|600px|thumb|{{cmd|d.path}} - Find shortest path for selected starting and ending node.]]
<center>
{|
| [[Image:V.net.iso.png|center|400px|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|400px|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|400px|thumb|{{cmd|d.path}} - Znajduje najkrótszą drogę dla wybranych początkowych i końcowych punktów.]]
|
|}
</center>
== See also ==
== See also ==
* [[GSoC Network Analysis]]: many new modules!
* [[Turntable]]
* [[GSoC Network Analysis]]: wiele nowych modułów!
== Linki zewnętrzne ==
== Linki zewnętrzne ==
Latest revision as of 10:00, 4 December 2018
Narzędzia GRASS do analiz sieciowych bazują na bibliotece DGlib Directed Graph Library.
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 d.vect (set display=dir).
Use Turntable to assign costs to turns on the network.
strona pomocy vectorintro "vector map processing and network analysis"
input - This is the name of input vector map or data source for direct OGR access.
output - This is the name for output vector map.
type - This parameter defines arc type, which can be line or boundary.
alayer - This parameter is a number and defines the arc layer. Vector features can have category values in different layers. This number determines which layer to use. When used with direct OGR access this is the layer name.
nlayer - This parameter is a number and defines the node layer. Vector features can have category values in different layers. This number determines which layer to use. When used with direct OGR access this is the layer name.
afcolumn - This is name of the cost column for moving in forward direction or forward and backward directions together.
abcolumn - This is name of the cost column for moving in backward direction.
ncolumn - This is name of the cost column for moving through nodes.
