Option -m in img2grd

Q&A
1

Working with radar altimetry data I can see in the readme file from Index of /pub/global_grav_1min that I can use the img2grd program in order to extract data from files. The suggested or der is

img2grd curv.img.23.1 -R-5/5/-10/10 -Gcurv.grd -D -T1 -m1 -E -S0.1 -V

I’m using GMT 6.5 on Debian and, althoug the order works as

gmt img2grd curv.img.23.1 -R-5/5/-10/10 -Gcurv.grd -D -T1 -m1 -E -S0.1 -V

I can not find the option -m1 in the documentation in img2grd — GMT 6.5.0 documentation.

What is the purpose of -m1 option? Is present in GMT 6.5 img2grd or not?

Thanks

2

When an option still works but doesn’t show up in manuals it means it is a deprecated option that is still maintained for backward compatibility. I had to go back to GMT4 to find a -m option.

3

Thank you very much for your answer, Joaquim. I found the old manual page in https://docs.generic-mapping-tools.org/4.5/gmt/html/man/img2grd.html. In moder versions, -m1 is then -I1