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I am trying to downscale sentinel-2 SWIR band (11) from 20 m to 10 m in ArcGIS. The create Pan-sharpened Raster Dataset tool requires colored RGB image. I only want to downscale SWIR band because red green and blue bands are already at 10 m resolution. What is the possible workaround?

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  • What are you using the downsampled SWIR band for?
    – Aaron
    Dec 1, 2020 at 16:51
  • @Aaron For MNDWI calculation
    – studysmart
    Dec 1, 2020 at 17:43

2 Answers 2

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You could run a Principal Component Analysis (PCA) on the 10m bands, take PCA 1 and then perform image fusion with the 20m band(s). Not sure about ArcGIS, but in GRASS GIS rather easily done (with i.pca and the i.fusion.hpf addon). Also other fusion methods may work.

Example:

Sentinel-2, original 20m land-water composite, Ratingen, Germany Sentinel-2, original 20m land-water composite, Ratingen, Germany

Sentinel-2, pan-sharpened 10m land-water composite, Ratingen, Germany Sentinel-2, pan-sharpened 10m land-water composite, Ratingen, Germany

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I am currently working on the same task. I found useful information in these papers: https://www.mdpi.com/2072-4292/8/4/354, https://www.mdpi.com/2504-3900/2/7/345. Hopefully you'll find them helpful too.

I am trying to understand if the HPF can be directly applied to the SWIR B11 alone or if one has to create a composite image before applying this type of fusion and then obtain the band of interest in a second step. Possibly one of our more expert colleagues can help with this doubt. I take the occasion to ask: for a quite new user do you suggest to just learn to use these already implemented tools like i.fusion.hpf or is it feasible to try to implement something more complex, like an ATWT? Would the difference in the result be worth the effort?

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