I have two Imagine files that I need to mosaic. When I added these two in Erdas Imagine, there is a black gap between them, for example, they are not properly aligned. I know very little bit about georeferencing, projection, or coordinate system, but I don't understand them very well.

Can you please explain me to understand how to align those two Imagery ?

two img files misaligned I tried to use the "MosaicPro" tool in Erdas Imagine and this can mosaic two imagine files to create seamless single into one Imagery file and how to "stitch" with the the right portion and the left portion?

  • 2
    Can you please edit your question to include a screenshot? Is the black gap just in between the images or is it surrounding the entire image?
    – Fezter
    Commented May 18, 2017 at 23:54
  • @Fezter, Thanks for your suggestion! the gap is just between images, I want to remove that gap, is this because the wrong coordination of the right partion ?
    – chenzero
    Commented May 19, 2017 at 0:24
  • 1
    Does the gap move when you change the order of the images? What happens if you try to make No Data pixels transparent (sorry, I don't know Erdas software very well)
    – Fezter
    Commented May 19, 2017 at 0:26
  • Also, when you use the Mosaic tool, ensure you Compute Active Area when you import the images. See this video
    – Fezter
    Commented May 19, 2017 at 0:30

1 Answer 1


At last, we found that those two portions are not aligned is because a third portion is found and should be placed between them.

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