问题描述
我有五个与加利福尼亚州接壤的县的shapefile，我试图将它们合并成一个大的shapefile，并保持县的原始边界.然后，我想绘制诸如此的点>因此，该地图仅需为县边界的简单地图.有没有办法在R中做到这一点，还是我必须使用类似ArcGIS的东西?
I have five shapefiles of bordering counties in California that I am trying to combine into one large shapefile and maintain the original borders of the counties. I then want to plot points such as this so the map only needs to be a simple map of county boundaries. Is there a way to do this in R or will I have to use something like ArcGIS?
关于在shapefile中进行合并的大量文档，例如此处，其中两个shapefile具有相同的坐标.但是没有关于仅部分共享坐标的shapefile的文档.
There is extensive documentation about merging within a shapefile such as here where both shapefiles have the same coordinates. But no documentation on shapefiles that only partially share coordinates.
推荐答案
如果只需要将所有边界放入一个数据集中，则可以使用sp/rgdal轻松地做到这一点，但是如果需要实际以几何方式合并边界(剪切/合并/溶解)，以此类推，R中的支持并不是那么简单.
If you only need to put all the borders into one data set then you can do that with sp/rgdal easily enough, but if you need to actually merge borders geometrically (clip/join/dissolve) and so on the support in R is not that simple.
大致来说，简单的选项是使用readOGR读取每个shapefile，然后将它们一起spRbind读取.如果rgdal难以构建/安装，则还有其他选项可用于读取各种软件包中的shapefile.
Roughly the simple option is read each shapefile with readOGR, then spRbind them together. If rgdal presents difficulties for building/installing then there are other options for reading shapefiles in various packages.
顺便说一句，类似于ArcGIS"，但更接近免费":www.manifold.net
btw, "something like ArcGIS" but much closer to "free": www.manifold.net
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