EXTRACT XYZ GRID OF TOPOGRAPHY

Extract topography from global 15 arcsecond grid in ASCII XYZ-format - SRTM15+ V2.7

Enter data window.

north
west east
south
These files can get quite large so you may have to divide the area up into smaller chunks.
Reference: Tozer, B., Sandwell, D.T., Smith, W.H., Olson, C., Beale, J.R. and Wessel, P., 2019. Global bathymetry and topography at 15 arc sec: SRTM15+. Earth and space science, 6(10), pp.1847-1864.

Related Links

Marine Gravity from Satellite Altimetry
SATELLITE GEODESY homepage