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QGIS is trying to create a polygon for the Raster image using Polygonize (Raster -> Vector).

My Raster Data is a satellite image, but when I Polygonize it, polygon is generated in each pixel and appears in grid form. This problem takes a lot of time to process. I'm going to create a polygon that fits the overall image size. Give me a tip.

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  • Do you want the result to be a footprint or bounding box? See explanations here: gis.stackexchange.com/a/269689/35561
    – Comrade Che
    Commented Mar 22, 2022 at 6:10
  • By the comment that you wrote into the answer, footprint is what you would like to get. Is that correct?
    – user30184
    Commented Mar 22, 2022 at 7:42

1 Answer 1

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You can use the Extract Layer Extent tool from the processing toolbox:

enter image description here

The output will be as expected:

enter image description here

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  • Hello I solved the problem by looking at your answer. Thank you so much. However, I have a few more questions and leave a comment. I cut the raster image and created a raster image in the shape of a staircase rather than a square shape. I used 'Extract Layer Extent' with this, but a square polygon was created. Can you make a polygon along the outer line of the cell?
    – bsg
    Commented Mar 22, 2022 at 6:46
  • If you have another question, please ask it as a new question with illustrations to make everything clear as per gis.stackexchange policy. You have got a square polygon because raster images are composed of pixels and they are always square-shaped or rectangular-shaped.
    – ahmadhanb
    Commented Mar 22, 2022 at 7:25
  • Thank you for your kind answer. I posted a new question. If you can help me, gis.stackexchange.com/questions/426729/… Please reply. Thank you.
    – bsg
    Commented Mar 22, 2022 at 8:26

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