地图能否增加南海诸岛的绘制

需要涉及合规问题，地图需绘制出南海诸岛九段线，不知能否提供下绘图数据。
直接使用g2的地图数据绘制有问题，对比了下发现两边的数据格式不一致。

Start by comparing the map data used by F2 with the referenced G2 map data, focusing on the reported format mismatch. Then identify F2's map-drawing entry point and determine the compliant data needed for the South China Sea islands and nine-dash line. Done means the map renders the requested geography with compatible data.

Written by the indexing model from the issue text.