The PLplot Plotting Library: Programmer's Reference Manual
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### `plmeridians`: Plot latitude and longitude lines.

`plmeridians` (mapform, dlong, dlat, minlong, maxlong, minlat, maxlat);

Displays latitude and longitude on the current plot. The lines are plotted in the current color and line style.

`mapform` (`void (*) (PLINT, PLFLT *, PLFLT *)`, input) A user supplied function to transform the coordinate longitudes and latitudes to a plot coordinate system. By using this transform, we can change from a longitude, latitude coordinate to a polar stereographic project, for example. Initially, x[0]..[n-1] are the longitudes and y[0]..y[n-1] are the corresponding latitudes. After the call to mapform(), x[] and y[] should be replaced by the corresponding plot coordinates. If no transform is desired, mapform can be replaced by NULL. `dlong` (`PLFLT`, input) The interval in degrees at which the longitude lines are to be plotted. `dlat` (`PLFLT`, input) The interval in degrees at which the latitude lines are to be plotted. `minlong` (`PLFLT`, input) The value of the longitude on the left side of the plot. The value of minlong must be less than the value of maxlong, and the quantity maxlong-minlong must be less than or equal to 360. `maxlong` (`PLFLT`, input) The value of the longitude on the right side of the plot. `minlat` (`PLFLT`, input) The minimum latitude to be plotted on the background. One can always use -90.0 as the boundary outside the plot window will be automatically eliminated. However, the program will be faster if one can reduce the size of the background plotted. `maxlat` (`PLFLT`, input) The maximum latitudes to be plotted on the background. One can always use 90.0 as the boundary outside the plot window will be automatically eliminated.

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`plmap`: Plot continental outline in world coordinates. | Up | `plmesh`: Plot surface mesh