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I have a mosaic of satellite images, but for the analysis, I need to define the boundaries of each part. Does anyone know how to do it in an automatic way? I need to get the red boundaries like on the second image but in an automatic way(please do not offer a manual digitization option). enter image description here

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I'm looking for some tool or algorithm that can help to make those boundaries automatically (there's a lot of similar). Maybe some raster processing techniques or should I dig in machine learning?

  • No, I mean each different element in each of that three rasters – Roman Perkhaliuk May 30 '18 at 8:06
  • Do you need a boundary for a whole raster, including "No Data" area, or just footpronts for imaged area? – Basile May 30 '18 at 8:11
  • I've clarified my question. Please check it again. – Roman Perkhaliuk May 30 '18 at 8:28
  • I don't think it is possible if your msaic is already merged composite. – Basile May 30 '18 at 10:35
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    I'm looking for some tool or algorithm that can help to make those boundaries automatically (there's a lot of similar). maybe some raster processing techniques or maybe should I dig in machine learning? – Roman Perkhaliuk May 30 '18 at 11:36
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I would recommend the Image Footprint plugin for QGIS. You can point it at a directory of images and it yields a shapefile with polygon boundaries of either valid pixels or bounding boxes of each image in the directory. The plugin also creates useful metadata within the polygon attributes.

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I see you are using ArcMap so:

1- Put all you images in one directory

2- Open ArcCatalog and create a temporary geodatabase

3- Rightclick inside Geodatabase and create a new "Mosaic Dataset" (name it whatever and chose the coordinate same as your images)

4- Than right click in Mosaic created and choose "Add Rasters..."

5- In new dialog table, choose as source the folder which are stored your images. (make sure "Update Boundary" is checked, by default it should be checked) click OK

6- open a blanck arcmap and load this Mosaic Dataset, you will have a layer footprint which contains what you are requesting (also attributes with images name).

  • The problem is that I haven't that rasters separately. I only have this mosaic and want to get all the pieces which are parts of it. So it is like an inverse problem. – Roman Perkhaliuk May 30 '18 at 12:23
  • Take a look here, they say it can be done also with .sid files community.esri.com/thread/92029 – Florjan May 30 '18 at 12:34
  • Thank you, but it seems that they solve another task in that discussion (tiling, not defining the boundaries) – Roman Perkhaliuk May 30 '18 at 13:04
  • Ok sorry, i thought that the boundaries that you are requesting are different tiles – Florjan May 30 '18 at 13:16

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