Is there a syntax that allows for a single meridian, say 53 east, in a global cartesian map?

Hey @george , Hm, I am not sure what you mean with “global cartesian map”. Being a bit more detailed here would help people to help you :slightly_smiling_face: Are you using GMT or one of the wrapper? If you are using PyGMT, maybe Figure.hlines or Figure.vlines is interesting for you? There is also…

Technical Reference / 4. Standardized command line options/ 4.3.8. Custom axes

OK. I hope you can help. I am starting with pscoast -R-180/0/-90/90 -JQ/6c -Dc and I want to finish (I think with -B…) so that the map shows only the 30 degree north parallel. I am running on a linux machine and can construct a text file in case you tell me I need some sort of custom constr…

Hi, Anda you have been shown the part of the manual that explains how to do that.

Yes, I have looked at that part of the manual. I don’t understand the syntax. Are there other examples of the use of “custom”?

You could also generate a great circle with project and plot.

Figured it out. A bit of a struggle reading the manual. Thanks

What did you end up doing? Any input how to improve the manual?

Lone meridian

Q&A

Andreas July 12, 2025, 6:42pm 7

Maybe Custom axes - gridline will now draw can help.

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Easy question. I use pscoast -JG30/0 -Rg. How do I get only the central meridian, 30East to show on the map? Q&A	1	55	July 5, 2025

Lone meridian

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