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How to get a more refined and smooth DEM?

Geographic Information Systems Asked on November 26, 2021

I have Two DEMs (Digital Elevation models)

  1. DEM (Image 1) – received from my institute
  2. DEM (Image 2) – downloaded from srtm

Both DEMs have been styled similarly. But DEM (Image 1) looks better than DEM (Image 2). The resolution of both the DEMs is also same that is 30m X 30m.enter image description hereenter image description here

My question is why they look differently after doing same styling in qgis and how I can get such DEMs as in image 1.

My OneDrive link to download the images is
https://1drv.ms/u/s!At3AD05XRRsNiFQRmp2KCiO1Mkmf?e=i6Owf9

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