Provided by: grass-doc_8.4.0-1_all 
NAME
v.profile - Vector map profiling tool
KEYWORDS
vector, profile, transect
SYNOPSIS
v.profile
v.profile --help
v.profile [-cz] input=name [type=string[,string,...]] [where=sql_query]
[layer=string] [output=string] [separator=character] [dp=integer] buffer=float
[map_output=name] [coordinates=east,north[,east,north,...]] [profile_map=name]
[profile_where=sql_query] [profile_layer=integer] [--overwrite] [--help] [--verbose]
[--quiet] [--ui]
Flags:
-c
Do not print column names
-z
Do not print 3D vector data (z values)
Only affects 3D vectors
--overwrite
Allow output files to overwrite existing files
--help
Print usage summary
--verbose
Verbose module output
--quiet
Quiet module output
--ui
Force launching GUI dialog
Parameters:
input=name [required]
Name of input vector map
Or data source for direct OGR access
type=string[,string,...]
Input feature type
Options: point, line
Default: point,line
where=sql_query
WHERE conditions of SQL statement without ’where’ keyword
Example: income < 1000 and population >= 10000
layer=string
Layer number or name
Use features only from specified layer
Default: 1
output=string
Path to output text file or - for stdout
Default: -
separator=character
Field separator
Special characters: pipe, comma, space, tab, newline
Default: pipe
dp=integer
Number of significant digits
Options: 0-32
Default: 2
buffer=float [required]
Buffer (tolerance) for points in map units
How far points can be from sampling line
Default: 10
map_output=name
Name for profile line and buffer output map
Profile line and buffer around it will be written
coordinates=east,north[,east,north,...]
Coordinates for profiling line nodes
Specify profiling line vertexes and nodes
profile_map=name
Profiling line map
Vector map containing profiling line
profile_where=sql_query
WHERE conditions for input profile line map
Use to select only one line from profiling line map
profile_layer=integer
Profiling line map layer
Default: 1
DESCRIPTION
v.profile prints out distance and attributes of points/lines along a profiling line.
Distance is calculated from the first profiling line coordinate pair or from the beginning
of vector line.
The buffer (tolerance) parameter sets how far point can be located from a profiling line
and still be included in the output data set.
The output map option can be used to visually check which points are profiled. The buffer
(tolerance) setting does not affect lines. Lines are sampled at their crossing point with
profiling line.
By default Z values are printed if input vector is a 3D map. It can be disabled with the
-z flag.
The profiling line can be provided as N,E coordinate pairs or from an input vector map. As
a profiling line must be a single line, the user should use the profile_where parameter to
select a single line from a profile input map if it contains multiple vector features.
NOTES
Currently the module can profile only points and lines (including 3D ones). Areas and
other complex features are not supported. If in future users can provide reasonable
examples how area sampling should work and why it is important, area (or any other feature
type) sampling can be added.
Due to bugs in GRASS native buffering algorithms, this module for now depends on GEOS and
will not function if GRASS is compiled without GEOS. This restriction will be removed as
soon as GRASS native buffer generation is fixed.
EXAMPLES
List all geonames along part of road NC-96 (NC Basic dataset). The output will be stored
in a file for later usage. We will use comma as delimiter and three numbers after decimal
separator for distance. Output file will contain data for all points, that are within 500
m range to profiling line.
v.profile input=geonames@PERMANENT output=/home/user/NC_96_geonames.csv\
separator=comma dp=3 buffer=500 profile_map=roadsmajor@PERMANENT profile_where=cat=56
# Now lets see the output:
cat NC_96_geonames.csv
Number,Distance,cat,GEONAMEID,NAME,ASCIINAME,ALTERNATEN,FEATURECLA,FEATURECOD,COUNTRYCOD,CC2,ADMIN1,POPULATION,ELEVATION,GTOPO30,TIMEZONE,MODIFICATI,PPLKEY,SRC_ID,MAINT_ID
1,360.719,26881,4482019,"New Zebulon Elementary School","New Zebulon Elementary School","","S","SCH","US","","NC",0,106,91,"America/Iqaluit","2006-01-15 00:00:00",0,0,0
2,846.806,22026,4476596,"Little River, Township of","Little River, Township of","","A","ADMD","US","","NC",0,0,91,"America/Iqaluit","2006-01-15 00:00:00",0,0,0
3,2027.918,16681,4470608,"Hendricks Pond","Hendricks Pond","","H","RSV","US","","NC",0,0,91,"America/Iqaluit","2006-01-15 00:00:00",0,0,0
4,2027.918,16690,4470622,"Hendricks Dam","Hendricks Dam","","S","DAM","US","","NC",0,0,91,"America/Iqaluit","2006-01-15 00:00:00",0,0,0
5,2999.214,39338,4496159,"Union Chapel","Union Chapel","","","","US","","NC",0,0,96,"America/Iqaluit","2006-01-15 00:00:00",0,0,0
6,3784.992,43034,4500325,"Zebulon Airport","Zebulon Airport","","S","AIRP","US","","NC",0,108,98,"America/Iqaluit","2006-01-15 00:00:00",0,0,0
Create river valley crossection and provide river marker (Spearfish dataset):
# Take elevation samples
r.profile input=elevation.dem@PERMANENT output=/home/user/elevation.profile \
profile=600570.27364,4920613.41838,600348.034348,4920840.38617
# Now get distance to place where river marker should be set
v.profile input=streams@PERMANENT output=/home/user/river_profile.csv \
east_north=600570.27364,4920613.41838,600348.034348,4920840.38617
BUGS
Strings are enclosed in double quotes ", still quotes within string are not escaped.
Output does not contain Vector CAT values. Only way how to get CAT value is from the
attribute table.
If sampled feature (point, line) contains multiple attribute entries (has multiple CAT
values), only the first one is reported. If this is a limitation in some practical use
case, a feature request in GRASS GIS issue tracker should be opened.
SEE ALSO
r.profile, Linear Referencing System
AUTHOR
Maris Nartiss
SOURCE CODE
Available at: v.profile source code (history)
Accessed: Thursday Aug 01 11:31:15 2024
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