v.lrs.where.1grass - Man Page
Finds line id and real km+offset for given points in vector map using linear reference system.
Keywords
vector, linear reference system, network
Synopsis
v.lrs.where
v.lrs.where --help
v.lrs.where lines=name points=name [llayer=string] [player=string] [rsdriver=string] [rsdatabase=string] rstable=string [threshold=float] [--help] [--verbose] [--quiet] [--ui]
Flags
- --help
Print usage summary
- --verbose
Verbose module output
- --quiet
Quiet module output
- --ui
Force launching GUI dialog
Parameters
- lines=name [required]
Name of input vector map
Input vector map containing lines- points=name [required]
Name of input vector map
Input vector map containing points- llayer=string
Layer number or name
Line layer
Default: 1- player=string
Layer number or name
Point layer
Default: 1- rsdriver=string
Driver name for reference system table
Options: dbf, mesql, mysql, odbc, ogr, pg, sqlite
Default: sqlite- rsdatabase=string
Database name for reference system table
Default: $GISDBASE/$LOCATION_NAME/$MAPSET/sqlite/sqlite.db- rstable=string [required]
Name of the reference system table
- threshold=float
Maximum distance to nearest line
Default: 1000
Description
v.lrs.where identifies line id and real milepost+offset for points in vector map using linear reference system.
Example
This example is written for the Spearfish dataset (it continues the example from v.lrs.create).
In this example, the ’route_lrs’ shall be queried for unknown positions (points, stored in the map newpoints) along the LRS:
# generate query points echo "590866.15|4926737.0 590933|4927133" | v.in.ascii out=newpoints v.lrs.where lines=route_lrs points=newpoints rstable=route_lrs pcat|lid|mpost|offset pcat|lid|mpost|offset 1|22|4.000000+212.091461 2|22|6.000000+188.112093 # verification g.region vector=route_lrs n=n+100 s=s-100 -p d.erase d.vect route_lrs d.vect busstops disp=attr attr=cat size=10 bg=white lcol=blue yref=bottom d.vect busstops icon=basic/circle fcol=blue d.vect newpoints col=red # measure distance to previous bus stop: # use measuring tool in graphical user interface
See Also
v.lrs.where, v.lrs.segment, v.lrs.label
LRS tutorial,
Introducing the Linear Reference System in GRASS
Authors
Radim Blazek, ITC-irst/MPA Solutions
Documentation update (based on above journal article and available fragments): Markus Neteler
Source Code
Available at: v.lrs.where source code (history)
Accessed: Saturday Nov 09 07:55:45 2024
Main index | Vector index | Topics index | Keywords index | Graphical index | Full index
© 2003-2024 GRASS Development Team, GRASS GIS 8.4.0 Reference Manual