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 
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 a related gallery example which can serve as an orientation of the usage Horizontal and vertical lines — PyGMT.
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 construction. Thanks for any advice to an amateur.
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”?
Maybe Custom axes - gridline will now draw can help.
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?