ISIS Application Documentation

campt

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Computes geometric and photometric information at a given pixel location

Description

Campt computes geometric and photometric information at a given pixel location or list of pixel locations in the input image cube. The program computes spacecraft and instrument related information, and other types of coordinates as described later in this document. The user will have a choice of coordinates in which to output the information as well as a choice in the output format of the information acquired.

Note the input image cube has preliminary requirements:

The input image requires SPICE information (see spiceinit).
The input image cube must be a Level0 or a Level1 ISIS cube.
To use a Level2 file as the input image (see mappt).

The point of interest in the image can be entered as Latitude/Longitude coordinates or Sample/Line coordinates. Keep in mind that the input Latitude and Longitude values entered will be interpreted as Universal Coordinates (ISIS default) regardless of the target body. In the output, all positions are in Body-Fixed Coordinates. Multiple points of interest may be specified by providing a comma-delimited flatfile of coordinates.

The following is a partial list of coordinates computed in the campt application:

Geometric Information: Latitude, Longitude, Oblique Detector Resolution, Line Resolution, Oblique Line Resolution

Photometric Information: Phase, Emission, and Incidence Angles

In addition, this application will return a list of other spacecraft, sun and instrument-related information including but not limited to Spacecraft Position, Spacecraft Azimuth, Sub-Spacecraft Longitude, SubSolar Latitude, SubSolar Longitude, and Time information (Ephemeris Time, UTC).

You may choose the format of the output file. The option list includes a choice of a PVL file or a flat file. A PVL file is a text file in label format, while the flat file is a comma-delimited text file that is easily imported into most databases and digital spreadsheets such as Microsoft Excel. Below is an example of campt output in PVL format. You can skim the left column of this PVL-formatted output file for a thorough listing of the types of coordinates, sun and instrument-related information computed when using campt.

Group = GroundPoint
  Filename                   = $ISISDATA/base/examples/ab102401.cub
  Sample                     = 1.0
  Line                       = 1.0
  PixelValue                 = 0.0607816
  RightAscension             = 65.749350916052 <DEGREE>
  Declination                = -18.390093214966 <DEGREE>
  PlanetocentricLatitude     = 34.444196777763 <DEGREE>
  PlanetographicLatitude     = 34.760399604837 <DEGREE>
  PositiveEastLongitude      = 223.84999971299 <DEGREE>
  PositiveWestLongitude      = 136.15000028701 <DEGREE>
  BodyFixedCoordinate        = (-2015.9595225544, -1936.6155808127, 1917.2574858384) <km>
  LocalRadius                = 3389756.4767145 <m>
  SampleResolution           = 536.05556350077 <m/pixel>
  LineResolution             = 536.05556350077 <m/pixel>
  ObliqueDetectorResolution  = 151.26661909292 <m/pixel>
  ObliquePixelResolution     = 605.06647637166 <m/pixel>
  ObliqueLineResolution      = 605.06647637166 <m/pixel>
  ObliqueSampleResolution    = 605.06647637166 <m/pixel>
  # Spacecraft Information
  SpacecraftPosition         = (-2025.6211429076, -2130.1417975758, 2009.318879871) <km>
  SpacecraftAzimuth          = 0.006855593033889 <DEGREE>
  SlantDistance              = 214.52515878961 <km>
  TargetCenterDistance       = 3560.6189705415 <km>
  SubSpacecraftLatitude      = 34.354896748841 <DEGREE>
  SubSpacecraftLongitude     = 226.44072947174 <DEGREE>
  SpacecraftAltitude         = 170.83335389965 <km>
  OffNadirAngle              = 36.149255932304 <DEGREE>
  SubSpacecraftGroundAzimuth = 91.64525294858 <DEGREE>

  # Sun Information
  SunPosition                = (-177337948.13839, 112957442.69098, -33704752.205292) <km>
  SubSolarAzimuth            = 172.30460990873 <DEGREE>
  SolarDistance             = 1.4234246174889 <AU>
  SubSolarLatitude           = -9.1071705738361 <DEGREE>
  SubSolarLongitude          = 147.50443340123 <DEGREE>
  SubSolarGroundAzimuth      = 254.69139701227 <DEGREE>

  # Illumination and Other
  Phase                      = 120.59515694473 <DEGREE>
  Incidence                  = 84.106289446623 <DEGREE>
  Emission                   = 38.288719431206 <DEGREE>
  NorthAzimuth               = 261.46910874636 <DEGREE>

  # Time
  EphemerisTime              = -69382819.160519 <seconds>
  UTC                        = 1997-10-20T10:58:37.6570806
  LocalSolarTime             = 17.089704420784 <hour>
  SolarLongitude             = 201.83159041209 <DEGREE>
  Error                      = NULL
End_Group

Related Applications to Previous Versions of ISIS

This program replaces the following applications existing in previous versions of ISIS:

levpt
lev1pt
photostat

Parameter Groups

Files

Name	Description
FROM	Input cube filename
USECOORDLIST	Enable coordinate list parameters in the GUI
COORDLIST	Input comma-delimited file of image or ground coordinates
COORDTYPE	Coordinate type selection (Image or Ground) for 'COORDLIST'
TO	Output text filename
FORMAT	Output format (PVL or FLAT)
APPEND	Option to append results to output file
ALLOWOUTSIDE	Allow sample/line values outside the image to be reported
ALLOWERROR	Allow campt to output results regardless of errors.

Position

Name	Description
TYPE	Coordinate type selection (Image or Ground)
SAMPLE	Sample position to report
LINE	Line position to report
LATITUDE	Latitude (planetocentric) position
LONGITUDE	Longitude (Positive East 360) position

Files: FROM

Description

Input image, which requires SPICE (see spiceinit) and must be a Level0 or a Level1 ISIS cube.

Type	cube
File Mode	input
Filter	*.cub

Files: USECOORDLIST

Description

Selecting this parameter will enable the 'COORDLIST' and 'COORDTYPE' parameters in the GUI.

Note that this parameter is optional when running campt on the command line.

Type	boolean
Default	FALSE
Exclusions	TYPE SAMPLE LINE LATITUDE LONGITUDE
Inclusions	COORDLIST COORDTYPE

Files: COORDLIST

Description

An input comma-delimited flatfile of image coordinates or ground coordinates. This allows the program to process multiple coordinates in a single run of campt, and output the results to the specified output file.

Expected order for image coordinates: sample, line
Expected order for ground coordinates: latitude, longitude

The "Error" keyword will only appear when using a coordinate list. The value of "Error" will then be NULL unless an error occurs during the processing of a coordinate in the coordinate list. Then, the value of this keyword will be the error message. This allows for campt to continue processing the remaining coordinates in the coordinate list.

For the input of Latitude and Longitude, campt expects Planetocentric Latitude (within -90 to 90 boundary) and Positive East Longitude (with 0-360 boundary) to find the location in the input camera image.

Type	filename
File Mode	input
Internal Default	None
Exclusions	TYPE SAMPLE LINE LATITUDE LONGITUDE

Files: COORDTYPE

Description

This parameter is used to select the type of coordinates entered in the coordinate list file, which will be used to determine the method to compute the geometric and photometric information.

Type

string

Option List:

Option	Brief	Description
IMAGE	Interprets coordinates in 'COORDLIST' as sample/line	This option interprets the coordinates provided in the input coordinate list file as sample/line and will compute latitude/longitude and Projection x/y.
GROUND	Interprets the coordinates in 'COORDLIST' as latitude/longitude	This option interprets the coordinates provided in the input coordinate list file as latitude/longitude and will compute sample/line and Projection x/y.

Exclusions

TYPE

Files: TO

Description

A text file in label format (PVL) which will contain the results of campt. This file can be used in conjunction with the getkey application in order to pass the results to another program when developing scripts.

Type	filename
File Mode	output
Internal Default	None

Files: FORMAT

Description

Format type for output file. PVL format is default.

Type

string

Default

PVL

Option List:

Option	Brief	Description
PVL	PVL format	Output file will be in PVL format
FLAT	Flat file format	Output file will be a comma-delimited flatfile. This file format can easily be imported into Excel.

Files: APPEND

Description

If this option is selected, the output from the application will be appended to the output file. If it is not selected, any information in the 'TO' file will be overwritten.

Type	boolean
Default	TRUE

Files: ALLOWOUTSIDE

Description

The Allowoutside parameter influences how campt will report resulting latitude/longitude and sample/line coordinates that fall outside the input cube pixel boundaries.

The default is set to True, which allows campt to return the values that are outside the cube pixel boundaries. For example, a given latitude/longitude might return a sample location of -1.0 (a single whole pixel coordinate off the left side of the image). This is a feature of the ISIS camera models.

When set to False, if a returned coordinate is off the image, campt will fail. This failure can be indicated and ignored within a batch script when only coordinates that fall within the image cube pixel boundaries are desired.

Type	boolean
Default	TRUE

Files: ALLOWERROR

Description

The Allowerror parameter enables campt to return results despite any errors. Errors will be listed under "Error" in the result table, providing the user with information about points that may lack surface intersection.

By default, campt is set to False, causing it to throw an error if any occur.

If campt is set to True, errors will be displayed in the error section of the results table instead of being thrown.

Type	boolean
Default	FALSE

Position: TYPE

Description

This parameter is used to select the type of coordinate entered, which will be used to determine the method to compute the geometric and photometric information.

Type

string

Default

IMAGE

Option List:

Option

Brief

Description

IMAGE

Interprets the coordinate as sample/line

This option interprets the coordinate as sample/line and will compute latitude/longitude and Projection x/y.

Exclusions

LATITUDE
LONGITUDE

GROUND

Interprets the coordinates as latitude/longitude

This option interprets the coordinate as latitude/longitude and will compute sample/line and Projection x/y.

Exclusions

LINE
SAMPLE

Position: SAMPLE

Description

This is the Sample position used to compute information at a given pixel location in the input image cube.

Type	double
Internal Default	Center sample

Position: LINE

Description

This is the Line position used to compute information at a given pixel location in the input image cube.

Type	double
Internal Default	Center line

Position: LATITUDE

Description

This is the Planetocentric Latitude (within -90 to 90 boundary) used to find the location in the input camera image.

Refer to Latitude Type.

Type	double
Minimum	-90.0 (inclusive)
Maximum	90.0 (inclusive)

Position: LONGITUDE

Description

This is the Positive East Longitude (with 0-360 boundary) used to find the location in the input camera image.

Refer to Longitude Direction and Longitude Domain.

Type	double
Minimum	0.0 (inclusive)
Maximum	360.0 (inclusive)

History

Jeff Anderson	2005-02-04	Original version
Elizabeth Ribelin	2005-06-20	Fixed bug in Latitude range
Jacob Danton	2005-12-02	Added appTest
Jacob Danton	2006-01-23	Fixed appTest to comply to changes in String
Elizabeth Miller	2006-03-23	Fixed appTest files to comply with changes to all camera models
Elizabeth Miller	2006-03-27	Modified to output a flatfile as well as a pvl, make GUI consistent with skypt
Elizabeth Miller	2006-04-19	Added additional output
Elizabeth Miller	2006-07-31	Modified to use OffNadirAngle instead of SpacecraftRoll angle due to changes made to the camera class
Sean Crosby	2007-04-12	Added RightAscension and Declination to PVL output. Program now requires user to specify a filename when using FLAT option. Increased precision in flatfile output and updated appTest truthdata.
Steven Lambright	2008-04-21	Added default values for the lines and samples
Steven Lambright	2008-05-12	Removed references to CubeInfo
Steven Koechle	2008-08-19	Removed unnecessary duplicate cube creation
Janet Barrett	2008-11-15	Added SubSolarGroundAzimuth and SubSpacecraftGroundAzimuth to PVL output. The SubSolarGroundAzimuth is the clockwise angle on the ground between a line drawn from the ground point to the North pole of the body and a line drawn from the ground point to the subsolar point. The SubSpacecraftGroundAzimuth is defined similarly except it uses the subspacecraft point.
Steven Lambright	2009-01-05	Added the ALLOWOUTSIDE option
Mackenzie Boyd	2009-08-24	Modified to use new class CameraPointInfo
Mackenzie Boyd	2009-09-14	Added missed functionality for defaulting to center sample/line
Tammy Becker	2012-01-13	Modified documentation and added Glossary links
Janet Richie, Ella Mae Lee	2012-11-20	Modified the documentation, fixes #1173
Lynn Weller	2013-02-25	Removed links to applications imbedded in text and replaced with italicized application name. Added application links to the "Related Objects and Documents" section of the documentation. Fixes mantis ticket #1525.
Ian Humphrey	2014-11-05	Added new parameters, USECOORDLIST, COORDLIST, and COORDTYPE for processing a list of points as input. Reorganized campt. Fixes #1449.
Ian Humphrey	2015-03-03	Updated documentation. References #1449.
Tyler Wilson	2016-08-17	Checked in new test data, and added support for changes made to the CameraPointInfo and Camera classes that incorporate new estimates for Pixel/Line/Sample/Detetctor resolution and now allow a developer to control the order in which fields are output in both PVL and CSV format. References #476, #4100.
Kaj Williams	2017-06-13	Resolved issue where the default value for the "allowoutside" parameter was supposed to be set to "true", but the default _behavior_ of campt was instead consistent with a setting of "false". In addition, corrected behavior where manually setting "allowoutside" to "false" was ignored. Ref # 2258.
Kaitlyn Lee	2018-02-16	Removed units on look direction vectors to make them unitless. Fixes #5125.
Kristin Berry, Jesse Mapel, and Stuart Sides	2021-02-10	Modified to output Nulls when using a CSM Camera model and some values are not available.

Quick Links

Documentation Versions

campt

Description

Categories

Related Applications to Previous Versions of ISIS

Related Objects and Documents

Applications

Parameter Groups

Files

Position

Files: FROM

Description

Files: USECOORDLIST

Description

Files: COORDLIST

Description

Files: COORDTYPE

Description

Files: TO

Description

Files: FORMAT

Description

Files: APPEND

Description

Files: ALLOWOUTSIDE

Description

Files: ALLOWERROR

Description

Position: TYPE

Description

Exclusions

Exclusions

Position: SAMPLE

Description

Position: LINE

Description

Position: LATITUDE

Description

Position: LONGITUDE

Description

History