Plot base maps and frames for the figure.
Creates a basic or fancy basemap with axes, fill, and titles. Several map projections are available, and the user may specify separate tick-mark intervals for boundary annotation, ticking, and [optionally] gridlines. A simple map scale or directional rose may also be plotted.
At least one of the parameters
compassmust be specified.
Full option list at https://docs.generic-mapping-tools.org/latest/basemap.html
B = frame
J = projection
JZ = zsize
Jz = zscale
L = map_scale
R = region
Td = rose
Tm = compass
U = timestamp
V = verbose
X = xshift
Y = yshift
c = panel
p = perspective
t = transparency
projection (str) – Required if this is the first plot command. projcode[projparams/]width. Select map projection.
map_scale (str) – [g|j|J|n|x]refpoint+wlength. Draws a simple map scale centered on the reference point specified.
rose (str) – Draws a map directional rose on the map at the location defined by the reference and anchor points.
compass (str) – Draws a map magnetic rose on the map at the location defined by the reference and anchor points
Select verbosity level [Default is w], which modulates the messages written to stderr. Choose among 7 levels of verbosity:
q - Quiet, not even fatal error messages are produced
e - Error messages only
w - Warnings [Default]
t - Timings (report runtimes for time-intensive algorthms);
i - Informational messages (same as
c - Compatibility warnings
d - Debugging messages
xshift (str) – [a|c|f|r][xshift]. Shift plot origin in x-direction.
yshift (str) – [a|c|f|r][yshift]. Shift plot origin in y-direction. Full documentation is at https://docs.generic-mapping-tools.org/latest/gmt.html#xy-full.
panel (bool or int or list) – [row,col|index]. Selects a specific subplot panel. Only allowed when in subplot mode. Use
panel=Trueto advance to the next panel in the selected order. Instead of row,col you may also give a scalar value index which depends on the order you set via
autolabelwhen the subplot was defined. Note: row, col, and index all start at 0.
perspective (list or str) – [x|y|z]azim[/elev[/zlevel]][+wlon0/lat0[/z0]][+vx0/y0]. Select perspective view and set the azimuth and elevation angle of the viewpoint. Default is [180, 90]. Full documentation is at https://docs.generic-mapping-tools.org/latest/gmt.html#perspective-full.
transparency (int or float) – Set transparency level, in [0-100] percent range. Default is 0, i.e., opaque. Only visible when PDF or raster format output is selected. Only the PNG format selection adds a transparency layer in the image (for further processing).