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 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
>
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>
> --
> Micha Silver
> Ben Gurion Univ.
> Sde Boker, Remote Sensing Lab
> cell: +972-523-665918
>
>
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