The NASA IMAGE mission involved launching a spacecraft to make detailed measurements of Earth's magnetosphere.  It relied heavily on Tcl/Tk for processing and display of data.

The software developed for the mission is publicly available at: [http://image.msfc.nasa.gov/]

[http://image.msfc.nasa.gov/ChrisDocs/CovSm.png]

A number of general purpose utility functions were written in Tcl for use in data processing.  See [http://image.msfc.nasa.gov/ChrisDocs/Tcl/TC.html].

Some of the functions:
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      '''TUarrayMath'''      Utilities applicable to numerical arrays
      '''TUbessenFN'''       Compute Bessel Functions
      '''TUdataCT'''         Geophysical coordinate transformations.
      '''TUdataFilter'''     1-D Data Filtering
      '''TUdataGrid'''       Place a set of data into a regular data grid (matrix)
      '''TUdataLSq1D'''      Generalized 1D Least Squares Fit
      '''TUdataLSq2D'''      2D Least Squares Fit
      '''TUdataLSq3D'''      3D Least Squares Fit
      '''TUdataMxMn'''       Maximum/Minimum locator for arrays of data.
      '''TUdataNLinLSq'''    Non-linear 2D Least Squares Fit to a Function
      '''TUdataNoOctal'''    Convert integer string to numerical value
      '''TUdataRnd1'''       Random number generator.
      '''TUdataStat'''       Determine the average value and variance of a data array.
      '''TUdataSwap'''       Swaps two data values
      '''TUdateConv'''       Convert Year/Day to Year/Month/Day and vice-versa
      '''TUfileSeek'''       Reposition the file pointer in a file
      '''TUgammaFn'''        Compute Γ(''x'') or ln(Γ(''x''))
      '''TUgridCut'''        Returns intensities along a cut through a grid
      '''TUgridFill1D'''     Fill gaps in a 1D data grid
      '''TUgridFill12D'''    Fill gaps in a 2D data grid
      '''TUgridFilter'''     Filter a 2D data grid
      '''TUgridGrow'''       Add rows or columns to a filled 2D grid
      '''TUgridInfo'''       Obtain information about a grid
      '''TUgridMath'''       Set of math operations suitable for data grids.
      '''TUgridNoise'''      Grid noise removal algorithms.
      '''TUgridPrint'''      Dump a grid to an [ASCII] file.
      '''TUgridReGrid'''     Regrid a grid
      '''TUgridRowCol'''     Get or replace a row or column of data in a grid
      '''TUgridTrim'''       Trim unused rows or columns off a grid
      '''TUintegTrap'''      Perform numerical integration
      '''TUlinearEq'''       Solve ''N'' coupled linear equations
      '''TUmatrixEig'''      Find eigenvalues and eigenvectors of a symmetric matrix
      '''TUmatrixInv'''      Matrix inversion and linear equation solver
      '''TUmatrixMath'''     Perform matrix operations
      '''TUmatrixRot'''      Rotation transformation matrix builder
      '''TUpolyExp1D'''      Computes the result of a 1D polynomial expression
      '''TUpolyExp2D'''      Computes the result of a 2D polynomial expression
      '''TUpolyExp3D'''      Computes the result of a 3D polynomial expression
      '''TUreadUDFrc'''      Parse the UDFrc file
      '''TUsolveCubic'''     Computes the solutions to a cubic equation.
      '''TUsolveQuadratic''' Computes the solutions to a quadratic equation.
      '''TUtimeCmp'''        Compare two times
      '''TUtimeFmt'''        Change time formats.
      '''TUtimeJulian'''     Compute a Julian time
      '''TUvecMath'''        A set of vector utilities
      '''TUyearLeap'''       Determines if a year is a leap year or not.
===

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