I want to mask cloud and land from band1 and band3, so that I wil get the ocean with clear cloud. To do that, I can create ROI from scatter plot. I want to know DN from ROI selection. So, I can create formula from DN range.
Regards, mega On Tue, Jan 5, 2021 at 5:46 AM Micha Silver <[email protected]> wrote: > 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: > > Hello guys, > > I create ROI from scatter plot using Interactive input for supervised > classification. I want to export data from ROI. But, I don't find the menu > or tool in Grass. > Could someone tell me the tool or menu in Grass? > > Regards, > mega > > _______________________________________________ > grass-user mailing > [email protected]https://lists.osgeo.org/mailman/listinfo/grass-user > > -- > Micha Silver > Ben Gurion Univ. > Sde Boker, Remote Sensing Lab > cell: +972-523-665918 > >
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