1. drawbounds：raw boundaries of shapes (default True)，绘制shape文件的边界，缺省打开

绘制底图边界 bmap.drawmapboundary(color='y',linewidth=1.0,fill_color='g',zorder=None,ax=None)

1. fill_color：fill the map region background with this color (default is to fill with axis background color).   If set to the string'none', no filling is done.填充底图背景区域颜色，缺省与坐标轴颜色相同，None为不填充

绘制国界 bmap.drawcountries(linewidth=0.5,linestyle='solid',color='k',antialiased=1,ax=None,zorder=None)

绘制经度线（子午线） bmap.drawmeridians(meridians,color='k',linewidth=1., zorder=None,dashes=[1,1],labels= 

                                 [0,0,0,0],labelstyle=None, fmt='%g',xoffset=None,yoffset=None,ax=None,latmax=None）

Draw and label meridians (longitude lines) for values (in degrees)given in the sequence ``meridians``绘制‘meridians’取值为子午线值得经度线，（可以用一个序列来画多个经度线）

1. meridians，子午线
2. dashes：dash pattern for meridians (default [1,1], i.e.1 pixel on, 1 pixel off),破折线的样式，列表中第一个为线的长度，第二个为空的长度
3. labels：list of 4 values (default [0,0,0,0]) that control whether meridians are labelled where they intersect the left, right, top or bottom of the plot. For example labels=[1,0,0,1] will cause meridians to be labelled where they intersect the left and and bottom of the plot, but not the right and top.列中的4个数字表示线标签的位置，分别为左、右、上、下，都为0时，不绘制标签。
4. labelstyle：if set to "+/-", east and west longitudes are  labelled with "+" and "-", otherwise they are labelled with "E" and "W".如果用+、-号表示的话，东为+，西为-，负责用E、W表示
5. fmt：a format string to format the meridian labels （default '%g') **or** a function that takes a longitude value in degrees as it's only argument and returns a formatted string.子午线标签的字符串格式，或者画经度线时设定一个值作为固定标记值，或者缺省返回线值。
6. xoffset：label offset from edge of map in x-direction (default is 0.01 times width of map in map projection coordinates)标签的x轴的偏移量
7. yoffset：label offset from edge of map in y-direction (default is 0.01 times height of map in map projection coordinates).标签的y轴的偏移量