i.ortho.camera(1grass) GRASS GIS User's Manual i.ortho.camera(1grass)
NAME
i.ortho.camera - Select and modify the imagery group camera reference
file.
KEYWORDS
imagery, orthorectify
SYNOPSIS
i.ortho.camera
i.ortho.camera --help
i.ortho.camera [group=name] camera=name [name=string] [id=string]
[clf=float] [pp=east,north] [fid=east,north[,east,north,...]]
[--help] [--verbose] [--quiet] [--ui]
Flags:
--help
Print usage summary
--verbose
Verbose module output
--quiet
Quiet module output
--ui
Force launching GUI dialog
Parameters:
group=name
Name of imagery group for ortho-rectification
camera=name [required]
Name of camera reference file
Name of input file
name=string
Camera name
id=string
Camera id
clf=float
Calibrated focal length
pp=east,north
Principal point coordinates
Coordinates
fid=east,north[,east,north,...]
Fiducial coordinates
Coordinates
DESCRIPTION
i.ortho.camera creates or modifies entries in a camera reference file.
For ortho-photo rectification, a camera reference file is required for
computation of scanned image to photo-coordinate transformation parame-
ters. There are two coordinate systems: The image coordinate system
(in pixels) and the photo coordinate system (in milli-meters). The in-
ner orientation establishes a relation between the pixels and the image
coordinates with help of fiducial marks.
The first prompt in the program will ask you for the name of the camera
reference file to be created or modified. You may create a new camera
reference file by entering a new name, or modify an existing camera
reference file by entering the name of an existing camera file.
After entering the camera file name, following menu is displayed:
Please provide the following information
CAMERA NAME: camera name______
CAMERA IDENTIFICATION: identification___
CALIBRATED FOCAL LENGTH mm.:_________________
POINT OF SYMMETRY (X) mm.:_________________
POINT OF SYMMETRY (Y) mm.:_________________
MAXIMUM NUMBER OF FIDUCIALS:_________________
AFTER COMPLETING ALL ANSWERS, HIT <ESC> TO CONTINUE
(OR <Ctrl-C> TO CANCEL)
The camera name and identification describe the camera reference file.
The calibrated focal length and the point of symmetry are used in com-
puting the photo-to-target transformation parameters. These values
should be entered from the camera calibration report (usually available
from the photograph supplier).
This example is the camera Zeiss LMK9 265-002A belonging to the Hel-
lenic Military Geographical Survey (HMGS) and calibrated in December
1985
The photo coordinate system origin is the so-called calibrated princi-
pal point (PP, Principal Point of Symmetry) which is in the center of
the image. The origin of the axes is at the intersection of the radii
traced from the fiducial marks. In the ideal case of no deviations in
the camera (see camera calibration certificate) the center is the ori-
gin and the values are 0 for both X and Y of Point of Symmetry. But
usually the principal point does not fall on the intersection of the
radii at the center of the picture. This eccentricity is usually of the
order of a few micrometers.
You are then asked to enter the X and Y photo coordinates of each fidu-
cial as follows. These fiducials (or reseau) marks are index marks im-
aged on film which serve as reference photo coordinate system. The max-
imum number of fiducials will determine the number of fiducial or re-
seau coordinate pairs to be entered below. The origin is the center of
the image (or the point of symmetry) and X and Y are left-right and
up-down. The order is up to the user, but must be kept consistent
throughout the rectification process.
On this screen you should enter the fiducial or reseau photo-coordi-
nates as given in the camera calibration report. The X, and Y coordi-
nates are in milli-meters from the principle point.
Please provide the following information
Fid# FID ID X Y
1__ _____ 0.0___ 0.0___
2__ _____ 0.0___ 0.0___
3__ _____ 0.0___ 0.0___
4__ _____ 0.0___ 0.0___
5__ _____ 0.0___ 0.0___
6__ _____ 0.0___ 0.0___
7__ _____ 0.0___ 0.0___
8__ _____ 0.0___ 0.0___
9__ _____ 0.0___ 0.0___
10_ _____ 0.0___ 0.0___
next: end__
AFTER COMPLETING ALL ANSWERS, HIT <ESC> TO CONTINUE
(OR <Ctrl-C> TO CANCEL)
The input display is repeated until the number of MAXIMUM FIDUCIALS is
reached.
SEE ALSO
i.ortho.photo, i.photo.2image, i.photo.2target, i.ortho.init
AUTHOR
Mike Baba, DBA Systems, Inc.
SOURCE CODE
Available at: i.ortho.camera source code (history)
Accessed: unknown
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