非洲数据:http://www.fao.org/countryprofiles/index/en/?iso3=KEN
Esri底图:http://cache1.arcgisonline.cn/ArcGIS/rest/services
数据下载:http://faostat3.fao.org/faostat-gateway/go/to/download/O/OA/E
经纬度:http://time.123cha.com/402.html
经纬度2:http://www.gpsspg.com/maps.htm