NAME¶

v.proj - Re-projects a vector map from one location to the current location.

KEYWORDS¶

vector, projection, transformation

SYNOPSIS¶

v.proj v.proj help v.proj [-lz] [input=name] location=name [ mapset=name] [dbase=path] [ output=name] [--overwrite] [-- verbose] [--quiet]

Flags:¶

-l

 

List vector maps in input location and exit

-z

 

Assume z co-ordinate is ellipsoidal height and transform if possible

 

3D vector maps only

--overwrite

 

Allow output files to overwrite existing files

--verbose

 

Verbose module output

--quiet

 

Quiet module output

Parameters:¶

input=name

 

Name of input vector map

location=name

 

Location containing input vector map

mapset=name

 

Mapset containing input vector map

dbase=path

 

Path to GRASS database of input location

output=name

 

Name for output vector map (default: input)

DESCRIPTION¶

v.proj allows a user to convert a vector map in a specified mapset of a specified location (different from current) with projection of input location to the vector map in a current mapset of current location with projection of current location (both projections are defined by corresponding PROJ_INFO files). The projection information is taken from the current PROJ_INFO files, as set and viewed with g.proj.

NOTES¶

If output is not specified it is set to be the same as input map name. If mapset is not specified, its name is assumed to be the same as the current mapset's name. If dbase is not specified it is assumed to be the current database. The user only has to specify dbase if the source location is stored in another separate GRASS database. v.proj supports general datum transformations, making use of the PROJ.4 co-ordinate system translation library. In order to preserve spatial detail, it is recommended to densify linear features with v.split before reprojecting. Depending on the source and target CRS (Coordinate Reference System), geometries can be substantially deformed (straight lines become curves, squares become trapezoids, etc). In these cases densification of linear features can help to avoid topological errors.

EXAMPLES¶

v.proj in=mymap location=latlong mapset=user1

REFERENCES¶

PROJ 4: Projection/datum support library. Further reading

SEE ALSO¶

r.proj, g.proj, g.setproj, i.rectify, r.stats, v.sample, v.split, v.surf.idw, v.surf.rst

AUTHORS¶

Irina Kosinovsky, US ARMY CERL M.L. Holko, USDA, SCS, NHQ-CGIS R.L. Glenn, USDA, SCS, NHQ-CGIS Last changed: $Date: 2014-01-13 10:31:51 +0100 (Mon, 13 Jan 2014) $ Full index © 2003-2014 GRASS Development Team