KEYWORDS
vector, network, vector
DESCRIPTION
Vector Network Analysis Tool is graphical front-end
for v.net* modules. It allows perform network analysis
directly in wxGUI without need to
use command line. The tool can be launched from Layer Manager
menu Vector → Network analysis → Vector network analysis
tool or from Map Display toolbar Analyse map → Vector
network analysis tool 
.
Subsets for nearest centers (v.net.alloc)
Vector Network Analysis Tool currently allows you to:
- perform these network analyses:
- show and set all data needed for the analysis (points, attribute
tables, compute costs)
- show analysis results (maps and it's attribute tables)
- snapping to nodes
- browse previous analysis results
NOTES
The tool is split into tabs. Every tab represents some functionality:
- Parameters tab
- It is used for setting vector map and
it's layer on which analysis will be done. Also it is possible to
set columns with cost values from attribute table connected
to particular layer.
- Points tab
- It manages points, which are used for analysis.
- Output tab
- There is a output console, which shows information about running
analysis.
- Input tables tab
- When existing vector map and it's existing layers are set
in Parameters tab, this tab is dynamically added. It shows
attribute tables of node and arc layers, which were chosen for
analysis. It is also possible to compute cost values in this
tab. This can be done by right mouse button click on column
label. Then from pop-up menu choose Add column, where new
column for cost values can be created. After that by right mouse
button click on the added column label can be chosen item Field
calculator. This tool computes cost values.
- Result tables tab
- The result of vector network analysis is always a vector map. Some
vector network analysis results can also include attribute
tables. If such a table is connected to the result map, this tab is
shown and with it you can browse the data.
KNOWN ISSUES
When some change is done in layer tree of Map Display, temporary
vector map representing result of analysis is not rendered
(use Show result button in toolbar to render it again).
SEE ALSO
wxGUI
wxGUI components
See list of vector network modules.
See also the
user wiki
page including video tutorial.
AUTHOR
Stepan Turek,
Google
Summer of Code 2012 (mentor: Martin Landa)