1photo.rectify(1)              Grass User's Manual             photo.rectify(1)
2
3
4

NAME

6       photo.rectify
7

DESCRIPTION

9       photo.rectify rectifies an image by using the image to photo coordinate
10       transformation matrix created by  photo.2image  and  the  rectification
11       parameters  created  by photo.2target.  Rectification is the process by
12       which the geometry of an image is made  planimetric.   This  is  accom‐
13       plished  by  mapping an image from one coordinate system to another. In
14       photo.rectify the parameters computed by photo.2image and photo.2target
15       are  used in equations to convert x,y image coordinates to standard map
16       coordinates for each pixel in the image.  The result is an image with a
17       standard  map coordinate system, compensated for relief distortions and
18       photographic tilt. Upon completion of the program the  rectified  image
19       is deposited in a previously targeted GRASS LOCATION.
20
21        You  are  asked  to  select the file(s) within the imagery group to be
22       rectified:
23
24        Please select the file(s) to rectify by naming an
25                           gs13.1 in PERMANENT   gs13.orect...
26                           gs14.1 in PERMANENT   .............
27            (enter list by any name to get a list of existing raster maps)
28                AFTER COMPLETING ALL ANSWERS, HIT <ESC> TO CONTINUE
29                           (OR <Ctrl-C> TO CANCEL)
30
31
32       More than one file may be rectified at a time.  Each file should have a
33       unique output file name.
34
35       The next prompt asks you to select one of two windows:
36
37
38             Please select one of the following options
39             1.   Use the current window in the target location
40             2.   Determine the smallest window which covers the image
41             >
42
43
44       photo.rectify  will  only rectify that portion of the image that occurs
45       within the chosen window.  Only that portion will be relocated  in  the
46       target  database. It is therefore important to check the current window
47       in the target LOCATION if choice number one is selected.
48
49       The process may take an hour or more  depending  on  the  size  of  the
50       image,  the  speed  of the computer, the number files, and the size and
51       resolution of the selected window.
52
53       The rectified image will be located in the  target  LOCATION  when  the
54       program  is  completed. The original unrectified files are not modified
55       or removed.
56

SEE ALSO

58        i.ortho.photo
59       photo.camera
60       photo.2image
61       photo.2target
62       photo.init
63

AUTHOR

65       Mike Baba,  DBA Systems, Inc.
66       Updated rectification and elevation map to FP 1/2002 Markus Neteler
67
68       Last changed: $Date: 2006-12-15 11:10:21 +0100 (Fri, 15 Dec 2006) $
69
70
71
72GRASS 6.3.0                                                   photo.rectify(1)
Impressum