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Hi: The interactive supervised classification allows you to draw, by hand, polygons covering pixels of classes that you want to use in your classification. The scatterplot preview, like the histogram, is just for understanding how correlated two specific bands are, for use in preparing those polygon training areas. Once you have prepared the polygon classes, you can save that vector to GRASS (the "Export training areas to map" button), then you run the (first step) in the classification process: creating the signature file. After the process finishes You must save the signature file (the next button on the toolbar) for use as input to the i.maxlik module (second step) to actually do the classification.
So it's not clear what you "want to export from ROI"?
Perhaps if you explain what is your final goal, it might be easier for someone to help. There's plenty of documentation on image classification that explains the procedure, for example, did you find this wiki page: https://grasswiki.osgeo.org/wiki/Image_classification
On 1/4/21 7:00 AM, mega saputra wrote:
-- Micha Silver Ben Gurion Univ. Sde Boker, Remote Sensing Lab cell: +972-523-665918 |
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