OrfeoToolBox OTB

Orfeo Toolbox is an open source package of image processing algorithms.

 
Among other, OTB provides a number of heavily documented functionalities as
  • image access: optimized read/write access for most of remote sensing image formats, meta-data access, visualization;
  • standard remote sensing preprocessing: radiometric corrections, orthorectification; filtering: blurring, denoising, enhancement; feature extraction: interest points, alignments, lines; image segmentation: region growing, watershed, level sets classification: K-means, SVM, Markov random fields; change detection; information extraction for integration in GIS and mapping systems.
http://orfeo-toolbox.org/otb/

Relevant to Landsat processing: - http://hg.orfeo-toolbox.org/OTB/file/65b0d0b2e3d6/Code/Radiometry/otbLandsatTMIndices.h
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