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.
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.
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
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.
Available at: v.profile source code (history)
Latest change: Thursday Dec 22 10:45:23 2022 in commit: a7a050ce379806297f2d0969ebdcf720a82f651c
Main index | Vector index | Topics index | Keywords index | Graphical index | Full index
© 2003-2023 GRASS Development Team, GRASS GIS 8.3.dev Reference Manual