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I'm trying to run supervised classifications and need all ROIs to be the same size. I'd like to capture the ROIs in ArcMap and so far can only find a tool which allows you to draw your ROIs by clicking and dragging to create polygons.

In ENVI and Erdas Imagine, there is a tool for capturing ROIs to ensure they are all the same size. For example if you want each ROI to be 9 pixels, when you're creating signature files, the cursor is 3x3 pixels. Then where you click on your raster, the 9 pixels are automatically captured without the need to draw a polygon. I can't remember what it's called as it's been a while since I used it.

After capturing the ROIs, I plan to export them as a tiff to use in EnMap

Does anyone know if such a tool exists in ArcMap?

  • If you need to also know about QGIS then I think that should be researched/asked as a separate question. – PolyGeo Oct 17 '16 at 23:08
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    You can create points, convert them into raster and expand it by 1 to get 9 pixel group. Convert them to polygons – FelixIP Oct 18 '16 at 1:49
  • Have you tried the mask tool? Also, as a workaround, create 9x9 pixel polygon; start editing; copy the polygon and paste where you need the clips. I don't know of a tool in ArcGIS that can select pixels like you describe. – jbalk Oct 18 '16 at 2:17
  • Thanks guys these both seem like viable options. Much appreciated – RoeG Oct 19 '16 at 0:01

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