1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
|
<h2>DESCRIPTION</h2>
<em>v.transform</em> transforms a vector map layer from one coordinate system
into another coordinate system.
<h2>NOTES</h2>
When using an ASCII table containing source and target coordinate pairs,
in each row four coordinate values separated by white space have to be specified.
Comments are permitted and have to be indicated by a '#' character.
<p>
Example for a points file of a linear transformation from XY to UTM coordinates
(L: left, R: right, U: upper, L: lower, N, S, W, E):
<pre>
# Linear transformation from XY to UTM coordinates:
# 4 maps corners defined
# UL NW
# UR NE
# LR SW
# LL SE
-584 585 598000 4920770
580 585 598020 4920770
580 -600 598020 4920750
-584 -600 598000 4920750
</pre>
The ground control points may be also (ir)regularly distributed
and can be more than four points.
<h2>EXAMPLE</h2>
<em>Most DXF/DWG drawings are done within XY coordinates. To transform
them to a national grid, we can use 'v.transform' with a 4 point
transformation</em><br>
<b>v.transform -t in=</b>watertowerXY <b>out=</b>watertowerUTM
<b>points=</b>wt.points <b>zscale=</b>0.04 <b>zshift=</b>1320
<h2>SEE ALSO</h2>
<em><a HREF="v.in.ogr.html">v.in.ogr</a></em>
<h2>AUTHOR</h2>
Radim Blazek, ITC-Irst, Trento, Italy
<p><i>Last changed: $Date: 2006/01/11 10:42:27 $</i>
|
