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Description: The COSI-Corr (Co-registration of Optically Sensed Images and Correlation), is a software package developed with IDL (Interactive Data Language) and integrated under ENVI. It allows for precise ortho-rectification, co-registration and correlation of SPOT and ASTER satellite images as well as aerial photographs. COSI-Corr makes it possible to measure local displacements between temporal series of images, possibly acquired by different instruments and at different resolutions, with measurement accuracy of the order of a small fraction of the nominal images' resolution. A plug-in for Environment for Visualizing Images (ENVI) remote sensing software, COSI-Corr is freely available from the California Institute of Technology's Tectonics Observatory to researchers and non-for-profit organizations.