Name
Description
Author
Type: SAR Interferometry
Removes a linear flat-earth component from a complex interferogram
A. Reigber
Generates interferogram / coherence maps of coregistrated SAR images. Includes presumming, selection of coherence window size and block processing for minimising the memory consumption.
A. Reigber
Fast amplitude coregistration using FFTs. Precision 1 Pixel
A. Reigber
Automatic co-registration for two complex SAR images with subpixel precision. The used algorithm is based on coherence optimisation. Useful only for spaceborne images where the offset between the images is constant.
A. Reigber
Coregistration with subpixel precision (based on coherence optimisation).
A. Reigber
Quite fast unweighted least square phase-unwrapping (using cosine transform and mirror expansion) in 27 lines of IDL. For good performance array size should be 2^N+1 (yes, really, i.e. 1025 or 4097 for example).
A. Reigber
Unweighted multigrid least square phase uwrapping, based on Gauss-Seidel relaxations. Should work on any array sizes.
A. Reigber
Weighted multigrid least square phase uwrapping, based on Gauss-Seidel relaxations. For masking out low-coherent areas, use low weighting values.
A. Reigber
Absolutely genius noise filter for interferometric phase images. Based on "quasi ergodic fluctuation modelling" - I never got exactly what it is. Unluckily my friend Youri does not want to give away the source-code of this wonderful algorithm, but you can have a binary (IDL 5.2 save file). Usage description can be obtained by "a=qef_filter()".
Y. Saveliev
calculates the complex coherency between 2 images
S. Guillaso
calculates the interferogram between 2 images
S. Guillaso
Simple boxcar filter for interferometric SAR images
A. Reigber
Type: SAR Polarimetry
Calculates the covariance matrices of a polarimetric data set.
A. Reigber
Computes for a fully polarimetric SAR data set (given in HV basis) the 3 standard decompositions (Borgeaud, Pauli, Sphere-Diplane-Helix) and saves the output into a tiff image.
M. Hellmann
Calculates the entropy, the anisotropy and alpha maps.
A. Reigber
Vectorial Lee filter for multiplicative image noise based on the analysis of local statistics. Used for speckle reduction of complex polarimetric SAR images.
A. Reigber
Refined vectorial Lee filter for multiplicative image noise based on the analysis of local statistics. Better preservation of image structures than the original Lee filter by the use of directional windows. Used for speckle reduction of complex polarimetric SAR images.
A. Reigber
Calculates the polarimetric entropy/anisotropy/average alpha angle from the eigenvectors and eigenvalues of the coherency matrix.
A. Reigber
Fast calculation of eigenvectors and eigenvalues of a complex 3x3 matrices using LAPACK. Used in polarimetric eigenvector decompositions.
A. Reigber
Type: Filters
Fast gaussian smooth for float/complex arrays.
A. Reigber
Lee filter for multiplicative image noise based on the analysis of local statistics. Very useful for speckle reduction of SAR amplitude images.
A. Reigber
Refined Lee filter for multiplicative image noise based on the analysis of local statistics. Better preservation of image structures than the original Lee filter by the use of directional windows.
A. Reigber
Replaces all "nanq" (not a number) in an array with zeros. I always get these bastards.
A. Reigber
Replaces all complex(0,0) with complex(0.1,0.1). Useful if you have to divide by something complex...
A. Reigber
Just like smooth for a 2D-array, but with the possibility of a rectangular box sizes, for example 9x3.
A. Reigber
Type: Plotting
Opens an image file written "writedata.pro" and generates an nice annotation bar as well as the histogram and display / saves all that. Needs several other routines.
V. Alberga
Plots a nice progress bar out of dots. Useful in longer loops.
A. Reigber
This is an excellent IDL widget plotting package for 1D graphs. Something similar to insight, but in contrary to that really useful. Visit also the graffer homepage.
James Tappin
Plots the histogram of an image or array
V. Alberga
Displays horizontal colorbar corresponding to a chosen image
V. Alberga
Displays vertical colorbar corresponding to a chosen image
V. Alberga
This procedure makes a legend for a plot. The legend can contain a mixture of symbols, linestyles, Hershey characters (vectorfont), and filled polygons (usersym). Very useful.
F.K. Knight and others
Similar to "horiz_colorbar.pro". Didn't got the difference :-)
V. Alberga
Similar to "horiz_colorbar.pro". Didn't got the difference :-)
V. Alberga
Similar to "horiz_colorbar.pro". Didn't got the difference :-)
V. Alberga
Switch on postscript device for plotting.
A. Reigber
Switch back to X device.
A. Reigber
Displays vertical colorbar corresponding to a chosen image
V. Alberga
Displays arrays (mostly) automatic. No more long interactive typing.
A. Reigber
Display an image on the display or in a PostScript file. Needed by "disp_save2.pro"
D. Fanning
Sends the content of an IDL graphic window directly to the printer.
A. Reigber
Type: Array handling
Generates a new 2D array out of two given 1D arrays. The result is an additive overlay of the two input arrays.
A. Reigber
Generates a new 2D array out of two given 1D arrays. The result is an multiplicative overlay of the two input arrays.
A. Reigber
Like with findgen, a 2d floating point array is generated. But here the slopes in x and y can be specified.
A. Reigber
Generates the one-dimensional relative index values of a rectangular box in a two-dimensional array. Used for fast addressing of pixel neighbourhoods.
A. Reigber
Like the help command, but gives more information about the array. Quite handy when debugging programs.
A. Reigber
Rebin for complex arrays (only 1,2 and 3 dimensional)
A. Reigber
Performs a rebin of a wo-dimensional complex array from and to any dimension using FFT's
A. Reigber
Resize any 1,2 and 3-D array with congrid. Just to lazy to type always cubic=0.5.
A. Reigber
Shift 2D complex array. Just like the normal shift, but with the possibility of subpixel shifts, i.e. "a=subshift(b,7.3,1.9)"
A. Reigber
Rotate very big arrays on the harddisk with a defined memory consumption. Useful if line by line operations have to be performed in the second index of a big array. Maybe it has to be adapted to your own data format.
A. Reigber
Type: Math
Calculates the adjoint (complex conjugate transpose) of an array
A. Reigber
Calculates the derivation of an one-dimensional array
A. Reigber
Calculates the Gauss distribution
A. Reigber
Calculates the Hamming weighting function
A. Reigber
Integrates an one-dimensional array
A. Reigber
Gives back if a number is even (2) or odd (1)
A. Reigber
Calculates the prime factors of a number. I used this to estimate the time of a FFT (proportional to the sum of the prime factors of the array length).
A. Reigber
Rounds a value to a given number of decimal places
A. Reigber
Calculate the signum function.
A. Reigber
Calculates the vector product between two (3x1) vectors
A. Reigber
Type: I/O
Loads single look complex SAR data sets (SLC) in 4 different formats. All 4 formats related to data of DLR's E-SAR system.
M. Hellmann
This routine loads the 4 single-look-complex (SLC) channels of a fully polarimetric SAR data set in 4 different formats (analogue to load-slc.pro).
M. Hellmann
Read an array written by sarr.pro. You can read only the header or alternatively a certain block out of the file. On-the-fly decompression.
A. Reigber
Opens and reads datasets saved to file using the writedata
V. Alberga
Save any array to a file. Read back with rarr.pro. I hate the save/restore function of IDL for this purposes as restore overwrites the saved variable name. With sarr/rarr you can save variable "a" and read it back as "b". You can also include a comment into the file, write only the header and perform on-the-fly compression with gzip.
A. Reigber
Write a file as unformatted .dat adding a 6 longword header containing informations about the data itself
T. Boerner
Write array to disk in a format understandable by xmgr/grace. Sometimes this is more confortable for plotting than the stupid IDL routines or using the even more stupid insight.
A. Reigber
Have another interesting routine? Please mail it to me if you like it to be included.