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Yes, there are free object-oriented (segmentation) software available. A few that come to mind are Spring, ITK, Orfeo toolbox and GRASS GIS. I would however point out that image segmentation is a poor direction to peruse when trying to model fractional cover. A segmentation algorithm is designed to minimize within unit variance and maximize between unit ...


I have attended training in use of the Semi-Automatic Classification Plugin for QGIS. From what I could see it could be what you are looking for. The whole rig is available for free, so money should not be an issue. Admittedly I am no expert in these tools, but the author says it includes several classification algorithms (Minimum Distance, Maximum ...


This is not exactly the answer to your question, but rather a suggestion. For RS, I would not use QGIS as a core software, because it is more oriented for GIS (even if it includes many tools). I suggest that you have a look at GRASS 7 (the new GUI is a true step forward). I don't have a look of experience because it is new, but I got some feedback and I've ...


Not exactly "high-resolution," but the price is right. Esri's World Imagery map service presents satellite imagery for the world and high-resolution imagery for the United States and other areas around the world.

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