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This is the command i.ortho.cameragrass that can be run in the OnWorks free hosting provider using one of our multiple free online workstations such as Ubuntu Online, Fedora Online, Windows online emulator or MAC OS online emulator

PROGRAM:

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 parameters. There are two coordinate systems: The image
coordinate system (in pixels) and the photo coordinate system (in milli-meters). The inner
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 computing 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 Hellenic Military
Geographical Survey (HMGS) and calibrated in December 1985

The photo coordinate system origin is the so-called calibrated principal 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 origin
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
excentricity is usually of the order of a few micrometers.

You are then asked to enter the X and Y photo coordinates of each fiducial as follows.
These fiducials (or reseau) marks are index marks imaged on film which serve as reference
photo coordinate system. The maximum number of fiducials will determine the number of
fiducial or reseau 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-coordinates as given in the
camera calibration report. The X, and Y coordinates 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.

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