NAME

       v.mkgrid  - Creates a GRASS vector map of a user-defined grid.

KEYWORDS

       vector, geometry

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: 2011-11-08 03:29:50 -0800 (Tue, 08 Nov 2011) $

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