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Can there be some instances where it is necessary to interpolate DEM when re-projecting (e.g. SRTM from WGS84 to another projection)?

My current understanding of interpolation tells me that one should interpolate a dataset only once (i.e. as SRTM has already been interpolated there is no need to do that again).

I have come across some comments where apparently it has been interpolated (again) when re-projecting. This is just a general question, just want to know if my understanding of interpolation is right or wrong.

closed as primarily opinion-based by Vince, whyzar, BERA, BBG_GIS, Antonio Falciano Nov 26 '17 at 19:55

Many good questions generate some degree of opinion based on expert experience, but answers to this question will tend to be almost entirely based on opinions, rather than facts, references, or specific expertise. If this question can be reworded to fit the rules in the help center, please edit the question.

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    Can you provide a link to at least one of the comments that you have come across? – PolyGeo Nov 25 '17 at 19:52
  • Can you please edit your question to give more information about your data and why you need to reproject it? Why do you think it needs to be interpolated again, and if so how would you expect to do so? – Midavalo Nov 26 '17 at 2:48
  • @Midavalo: I don´t have any data. As I mentioned, this is just a general question. I want to know if I my understanding of interpolation is correct or not. For example, if you would work with SRTM (dds.cr.usgs.gov/srtm/version2_1/SRTM3), and you would reproject it to the projection relevant to your country, would you need to interpolate? – mikbet Nov 26 '17 at 17:36
  • @mikbet What comments have you come across? Can you link to them? Why do you think it needs to be interpolated again, and if so how would you expect to do so? Why would you need to reproject (and not project your data to that of the DEM)? – Midavalo Nov 26 '17 at 17:46
  • I think this is an interesting question. Could understand some people finding it unclear or broad; but primarily opinion-based? – Andre Silva Nov 26 '17 at 17:54