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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

       Last changed: $Date: 2017-11-19 00:37:09 +0100 (Sun, 19 Nov 2017) $

SOURCE CODE

       Available at: v.profile source code (history)

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