Over the last few days I pretty much dove head first into using R for mapping. I have used R extensively for modelling etc. but not this kind of work before. I have some questions and issues regarding shapefiles, how they're read and so on. Over the last few days I pretty much dove head
阅读背景：
使用ggplot2错误绘制形状文件
来源：互联网
分享到：
