USIBWC Base Map666

This map represents base layers for the USIBWC.It has been digitized using a variety of vector and raster data sources. It is intended for mapping purposes only.本地图为美国国际边界与水委员会（United States International Boundary and Water Commission，USIBWC）的基础底图图层。该地图依托多种矢量（vector）与栅格（raster）数据源完成数字化处理。本地图仅可用于制图相关用途。