安装geopandas时出现如下错误：
A GDAL API version must be specified. Provide a path to gdal-config using a GDAL_CONFIG environment variable
or use a GDAL_VERSION environment variable.
按照网上其他的贴子，安装whl文件也出现了部分问题，最后参考了：链接，成功解决；
运行下边的命令：
pip install wheel
pip install pipwin

pipwin install numpy
pipwin install pandas
pipwin install shapely
pipwin install gdal
pipwin install fiona
pipwin install pyproj
pipwin install six
pipwin install rtree
pipwin install geopandas