We are writing an article in which we should give a figure (a satellite image; not a real map) to make the 'preliminary' section complete and understandable.
However, drawing the image ourselves is not possible. However, as the image is related to a well-known problem, it is available in various Q & A forums. The same image can be found in multiple such forums and we do not know the original source of the image.
In such a scenario,
- Would it be unethical to not cite the forum in our research paper?
- If we must cite any of the available forum links, how are we supposed to cite the image?