NAME
v.mkgrid - Creates a GRASS vector map of a user-defined grid.
KEYWORDS
vector
SYNOPSIS
v.mkgrid
v.mkgrid help
v.mkgrid [-pq] map=name grid=rows,columns [position=string] [coor=x,y] [box=width,height] [angle=float] [breaks=integer] [--overwrite] [--verbose] [--quiet]
Flags:
- -p
- Create grid of points instead of areas and centroids
- -q
- Quiet; No chatter
- --overwrite
- Allow output files to overwrite existing files
- --verbose
- Verbose module output
- --quiet
- Quiet module output
Parameters:
- map=name
- Name for output vector map
- grid=rows,columns
- Number of rows and columns in grid
- position=string
- Where to place the grid
- Options: region,coor
- Default: region
- region: current region
- coor: use 'coor' and 'box' options
- coor=x,y
- Lower left easting and northing coordinates of map
- box=width,height
- Width and height of boxes in grid
- angle=float
- Angle of rotation (in degrees counter-clockwise)
- Default: 0
- breaks=integer
- Number of horizontal vertex points per grid cell
- Options: 3-30
- Default: 3
DESCRIPTION
v.mkgrid will create a vector map representation of a regular coordinate grid.
Both point and area vector grids can be created.
NOTES
Grid points created with the -p flag will be placed at the
center of each grid cell, not at the grid line nodes.
This is NOT to be used to generate a vector map of USGS quadrangles,
because USGS quads are not exact rectangles.
EXAMPLES
Make a 4x3 grid, cells 20km a side, with lower left corner at 2716500,6447000:
v.mkgrid map=coro_grid grid=4,3 position=coor coor=2716500,6447000 box=20000,20000
Make a 10x12 lat/lon grid, cells 2 arc-min a side, with lower left corner
at 167deg 52min east, 47deg 6min south. For use with e.g. QGIS you can then
pull this grid into a projected location with v.proj before
exporting as a Shapefile with v.out.ogr (within GRASS you could
just use d.grid -w from the projected location for the same effect).
v.mkgrid map=p2min_grid grid=10,12 position=coor coor=167:52E,47:06S box=0:02,0:02
SEE ALSO
v.patch,
d.grid
AUTHOR
Michael Higgins,
U.S.Army Construction Engineering
Research Laboratory
Update for new vectors Radim Blazek 10/2004
Last changed: $Date: 2010-01-16 20:38:59 -0800 (Sat, 16 Jan 2010) $
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