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ISIS Application Documentation

cnetcheck

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Checks the validity of a control network

Overview Parameters

Description

This program checks for the validity of a Control Network. It is recommended to run cnetcheck before running jigsaw (can use the same input image cube list and control network) in order to catch a choice of potential issues with the control network and the corresponding input image cube list.

The default primary function of cnetcheck is to idenify any Islands within the control network (CNET). Each identified 'Island' will have an output file associated with it ("PREFIX"_Island.#, where #=sequential number id). The output Island files contain the list of images connected together as a group, the file includes the cube filenames and corresponding serial numbers.

NOTE1: If a serial number is identified as a single image island and the corresponding image cube file name is not listed within the FROMLIST, then the image cube filename will not be included in the appropriate island file.

NOTE2: If it is discovered that a known island is missing an output island file (i.e., output list not created as expected), it is possible that the image cube file name(s) were not listed in the input list (FROMLIST).

All output files are created in the working directory where cnetcheck is initiated.

Categories

History

Christopher Austin2008-07-09 Original version
Steven Lambright2008-07-10 Fixed output files to only show filenames and usage of c_str.
Christopher Austin2008-07-28 Fixed NoLatLon option.
Christopher Austin2008-08-01 Added Control Point IDs to the NoLatLon flat file.
Christopher Austin2008-10-28 Greatly optimized the NoLatLon option.
Steven Lambright2008-11-24 Renamed parameters: "LIST" is now "FROMLIST" and "CONTROL" is now "NETWORK"
Christopher Austin2009-04-07 Added the IGNORE option, which ignores ignored Control Points.
Christopher Austin2009-04-23 Added a results group that correlates parameter names to keywords, fixed the newline character outputs, and changed NOMATCH to NOCONTROL.
Christopher Austin2009-05-15 Fixed the island detecting to disregard ignored control points and other bug fixes.
Christopher Austin2009-06-03 Fixed a bug with ignored Control Measures, changed NETWORK to CNET, changed the output formats to be more useful and consistant.
Christopher Austin2009-08-21 Cleaned up syntax and improved readability.
Christopher Austin2009-09-18 Added the SINGLECUBE parameter, renaming SINGLE to SINGLEMEASURE as a consequence.
Mackenzie Boyd2010-05-28 Modified functionality of NOLATLON option to check all measures, not just each cube.
Christopher Austin2009-06-08 Added the DELIMIT parameter
Christopher Austin2010-10-06 Fixed for binary cnet conversion.
Christopher Austin2011-01-18 Altered to compile with the new Control redesign.
Christopher Austin2011-02-10 Swapped the order of to serial number and filename in the NOCONTROL output file.
James Alexander Crough and Eric Hyer2011-06-15 Added ability to check the ratio between the convex hull of the cnet and its parent cube.
Travis Addair2011-08-10 Added LOWCOVERAGE option to make convex hull check optional.
Tammy Becker2011-11-17 Modified documentation and changed Tolerance default from 0.0 to 1.0.

Parameter Groups

Input Files

Name Description
FROMLIST List of input cube file names in the Control Network
CNET Input Control Network file

Output Options

Name Description
DELIMIT The character to be inserted between output file field entries
CUSTOMUser-defined delimiter
PREFIX Output result filename prefix
IGNORE Disregard 'Ignored' Control Points when checking the Control Network

Checks

Name Description
NOCONTROL Check for images in the FROMLIST that are not in the Control Net
NOCUBE Checks for images in the Control Network that are not in the FROMLIST
SINGLEMEASURE Check for Control Points that contain only a single Control Measure
DUPLICATE Check for Control Points containing same image in multiple Measures
SINGLECUBE Check for images that are measured to only one Control Point
NOLATLON Check for measures whose latitudes and longitudes cannot be computed
LOWCOVERAGE Check for the distribution of Control Points across each image
TOLERANCE Minimum ratio of convex hull coverage to cube area allowed
X

Input Files: FROMLIST

Description

A text file containing one column of ISIS image cube file names. Every image cube file used in the control network should be included in this list. The input images are required to be a Level0 or Level1 cube with a successful 'spiceinit' applied previously.

Type filename
File Mode input
Filter *.txt *.lis *.list
Close Window
X

Input Files: CNET

Description

Use this parameter to specify the input Control Network file for validation.

Type filename
File Mode input
Filter *.net
Close Window
X

Output Options: DELIMIT

Description

This option determines which character will be used to separate the output file field entries, with the default option as a tab. Other options are comma, single space, or "OTHER," which allows the user to input whatever they wish as the delimiter character.

Type string
Default TAB
Option List:
Option Brief Description
TABSeparate with tabs This option will cause the output file field entries to be separated by tabs.

Exclusions

  • CUSTOM
COMMASeparate with commas This option will cause the output file field entries to be separated by commas.

Exclusions

  • CUSTOM
SPACESeparate with spaces This option will cause the output file field entries to be separated by single 'white' space.

Exclusions

  • CUSTOM
OTHERSeparate with user-defined characters This option allows the user to determine what character is used to separate field entries. When this option is selected, the CUSTOM parameter contains the user-defined string that will be used between the output file field entries.

Inclusions

  • CUSTOM
Close Window
X

Output Options: CUSTOM

Description

This parameter is only used if the user has selected "OTHER" as a delimiter. The user enters a string into this parameter to use as the output delimiter.

Type string
Close Window
X

Output Options: PREFIX

Description

The results of the validity check are placed in output file names with the given prefix.

For example, PREFIX=CHK_, will result in an output filename CHK_Island.1 or CHK_NoControl.txt

Type string
File Mode output
Close Window
X

Output Options: IGNORE

Description

When Ignore=TRUE, any control points and control measures that are flagged as invalid within the network (IGNORE=TRUE), are NOT considered links across images/groups when identifying islands.

Ignore=TRUE is the default for consistency with other apps, such as jigsaw, that do NOT consider invalid points or measures.

When Ignore=FALSE, all valid and invalid control points and control measures are considered for links between images and groups.

Type boolean
Default True
Close Window
X

Checks: NOCONTROL

Description

NOCONTROL=True, given the input image cube file name list (FROMLIST), any files (and their corresponding serial number) that are not found in the input control network (CNET) are considered images without control. These filenames and serial numbers will be listed in the output file named [PREFIX]NoControl.txt (with a field delimiter [DELIMIT]).

No output file will be created if all images are controlled.

NOCONTROL=False will turn off this testing of images without control.

Type boolean
Default True
Close Window
X

Checks: NOCUBE

Description

NOCUBE=True, an output file named [PREFIX]NoCube.txt will be created, which will list all serial numbers encountered in the input Control Network (CNET) that do not have a corresponding image cube file name in the provided list (FROMLIST).

No output file will be created if all serial numbers match to an image cube file name.

NOCUBE=False will turn off the testing for matching serial number and input image file names.

Type boolean
Default True
Close Window
X

Checks: SINGLEMEASURE

Description

SINGLEMEASURE=True, a file named [PREFIX]SinglePointCubes.txt will be created, which will list all image cube file names that exist as the single Control Measure in any Control Point within the provided Control Network.

Note: In general and when possible, a control point should have more than one control measures (more than three).

If there are no such single Control Measures, then no file is created.

Type boolean
Default True
Close Window
X

Checks: DUPLICATE

Description

When true, a file named [PREFIX]DuplicateMeasures.txt will be created, which will list all image cube filenames that exist in more than one Control Measure in a single Control Point.

Images under this scenario must be resolved before running jigsaw. A single image must not have more than one measure to the same control point.

If there are no such duplicate Control Measures, then no file is created.

Type boolean
Default True
Close Window
X

Checks: SINGLECUBE

Description

When true, a file named [PREFIX]SingleCubes.txt will be created, that will list all image cube filenames that are measured to only one control point.

These images would have a convex hull value near zero, meaning there are not enough control points. Where possible, any image should have measures to multiple control points along the image plane boundaries (convex hull value near 1.0 for a full distribution). Refer to the Tolerance parameter for a distrubution test.

If there are no such single Cubes, then no file is created.

Type boolean
Default True
Close Window
X

Checks: NOLATLON

Description

When true, a file named [PREFIX]NoLatLon.txt will be created, which will list all Serial Numbers within the given Control Network and FROMLIST which a latitude and longitude value cannot be computed at their respective image measure coordinate.

These identified Serial Numbers and image cube filenames will be followed by the Control Point IDs where the latitude and longitude could not be computed at the associated measures.

If there are no such serial numbers, then no file is created.

Only image cubes included in both the FROMLIST and CNET are checked.

Type boolean
Default True
Close Window
X

Checks: LOWCOVERAGE

Description

The main purpose of this test is to isolate the images that have an insufficient distribution of control point measures. This is performed by constructing a convex hull from all Control Measures located on the image in "image pixel space". The convex hull gives a rough estimation of the distributed coverage of Control Points in the input control network across each image. By enabling this option, a file named [PREFIX]LowCoverage.txt will be created containing all images (with corresponding serial numbers) whose convex hull coverage is less than the given user-specified TOLERANCE. A third column will also be output, showing the actual coverage value for each reported image.

The default of 1.0 for a max tolerance will effectively cause nearly every image to be reported, as it is highly unlikely that a convex hull will cover 100% of it's corresponding image. With a tolerance of 0.25, any image whose convex hull covers less than a quarter of the image area will be reported. A minimal tolerance of 0.0 effectively makes the test meaningless, allowing images to "pass" this test without having ay control point coverage.

Only cubes in both the FROMLIST and CNET are checked.

Type boolean
Default True
Inclusions
  • TOLERANCE
Close Window
X

Checks: TOLERANCE

Description

Given the area of the convex hull, generated from all measures in an image, divide by the total area of the image. The resulting value from 0.0 to 1.0 shows roughly what percentage of the image is covered by its measures. If this coverage value is less than the tolerance specified by this parameter, then the image will fail the LOWCOVERAGE check and be reported as such. This value must be between 0.0 and 1.0, inclusive.

Type double
Default 1.0
Minimum 0.0 (inclusive)
Maximum 1.0 (inclusive)
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