python basemap 中一些函数括号内值的含义与用法

官方网页：
http://matplotlib.org/basemap/api/basemap_api.html#mpl_toolkits.basemap.Basemap.contour
如：

contour

(x,
y, data, *args, **kwargs)
Make a contour plot over the map(see matplotlib.pyplot.contour documentation).

If

latlon

keyword is set to True, x,y are intrepreted aslongitude and latitude in degrees. Data and longitudes areautomatically shifted to match map projection region for cylindricaland pseudocylindrical
projections, and x,y are transformed to mapprojection coordinates. If

latlon

is False (default), x and yare assumed to be map projection coordinates.

Extra keyword

ax

can be used to override the default axis instance.

If

tri

is set to

True

, an unstructured grid is assumed(x,y,data must be 1-d) and matplotlib.pyplot.tricontour is used.

Other *args and **kwargs passed on to matplotlib.pyplot.contour(or tricontour if

tri=True

).