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thanks everybody for your comments and reply I used the grdconvert command in GMT to convert the mentioned .srtm to .grd format.


QGIS does it easily. open the NETCDF (or whatever format the SRTM sits in) by add raster right click on the menu item and select export choose the file format as .xyz DONE!


NOTE: This is not the solution to the question in the title but it solves the problem described in the question's text. Alternative solution I would download the netCDF files from the grd directory instead of the srtm files from the data directory on the FTP server. The netCDF files can directly be plotted by GMT. Example Based on this file: #...

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