Here are many questions with great answers about open source GIS software.
I am wondering, what is the best open source software package for Remote Sensing? I would like to learn it and to use in my work.
I used to work with IDRISI, and I've heard about Erdas and ENVI, but they all are not free. I am looking for a free and powerful leader, like Qgis for GIS or R for statistics. With powerful classification, segmentation, Fourier, filters, PCA, etc.
Can anyone please advise me a good free RS software? What are the capabilities, user friendly or with command line? Do any comparison matrices exist?