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
3) 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
AUTHORS¶
Michael Higgins, U.S.Army Construction Engineering Research Laboratory
Update for new vectors Radim Blazek 10/2004
Last changed: $Date: 2014-05-16 19:12:35 +0200 (Fri, 16 May 2014) $
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