NAME
i.gcp - Manages Ground Control Points (GCPs) non-interactively.
KEYWORDS
imagery,
georectification,
GCP
SYNOPSIS
i.gcp
i.gcp --help
i.gcp [-lcduibrLB] group=name [image_coordinates=east,north] [target_coordinates=east,north] [status=string] [point=integer[,integer,...]] [--help] [--verbose] [--quiet] [--ui]
Flags:
- -l
- List all ground control points
- -c
- Clear all ground control points
- -d
- Delete selected ground control points
- -u
- Use selected ground control points
- -i
- Ignore selected ground control points
- -b
- Back up the point file
- -r
- Restore the backup point file
- -L
- List all ground control points in the backup point file
- -B
- Remove the backup point file
- --help
- Print usage summary
- --verbose
- Verbose module output
- --quiet
- Quiet module output
- --ui
- Force launching GUI dialog
Parameters:
- group=name [required]
- Name of input imagery group
- image_coordinates=east,north
- Image coordinates to add
- target_coordinates=east,north
- Target coordinates to add
- status=string
- Status for new ground control points
- Options: use, ignore
- Default: use
- point=integer[,integer,...]
- Point number(s) to manage
- Options: 1-
i.gcp manages Ground Control Points (GCPs) non-interactively.
Unlike
g.gui.gcp,
i.gcp can be invoked from the command line
or scripts to manage GCPs. It is recommended to create a backup copy of the
original POINTS file using
-b before making changes to the file. The
backup POINTS file (POINTS_BAK) can be restored using
-r or removed
later using
-B. GCPs in the backup POINTS file can be listed using
-L.
List all GCPs in group "sar":
Create a backup copy of the current POINTS file:
Clear all GCPs first by removing the POINTS file:
Add new GCPs at the bottom-left and top-right corners of the satellite imagery:
i.gcp group=sar image_coordinates=0,0,31996,32239 target_coordinates=493920,3880490,529470,3916310
Add another GCP that will be ignored for now and list all GCPs:
i.gcp -l group=sar image_coordinates=100,100 target_coordinates=500000,4000000 status=ignore
Use the GCP just added and list all:
i.gcp -u -l group=sar point=3
Delete point 1:
i.gcp -d -l group=sar point=1
Ignore points 1-2:
i.gcp -i -l group=sar point=1-2
List GCPs in the backup POINTS file:
Restore the backup POINTS file:
Remove the backup POINTS file:
The GRASS 4
Image
Processing manual
i.group,
i.target,
i.rectify,
i.points.auto,
Ground Control Points Manager
Huidae Cho
SOURCE CODE
Available at:
i.gcp source code
(history)
Latest change: Monday Jan 30 19:49:11 2023 in commit: 5fb6b1a969e72db28df78483d3360b15a17f0c68
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© 2003-2024
GRASS Development Team,
GRASS GIS 8.4.1dev Reference Manual