What are the best available free DEM image ?

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Zaidoon Taha Abdulrazzaq

I think the DEM which derived from ALOS PALSAR are the best available DEM

https://www.youtube.com/watch?v=nTAP4cOBz2U

Nadia A. Aziz

Check the height accuracy in this link,

ASTER(30)=13

SRTM (90)= 9

Alose (30)= 5

https://www.int-arch-photogramm-remote-sens-spatial-inf-sci.net/XL-4/243/2014/isprsarchives-XL-4-243-2014.pdf

Sajjad Munir

ASTER DEM from glovis.usgs.gov @30 meter