如何将csv转换为R中的shp [英] How to convert csv to shp in R

问题描述

我过去几天一直在尝试将csv转换为shapefile。我知道我可以很容易地在QGIS或Arc中做，但是想将这个过程添加到现有的R代码中。

所以我可以在没有问题的情况下阅读csv p>

  MyData<  -  read.csv（file =c：/TheDataIWantToReadIn.csv，header = TRUE，sep =， ）
  

我从Packages Shapefile帮助指南中找到了下面的代码。然而，我似乎找不到一种方法来处理我的代码。我的行是每一个点，因此我要创建的shapefile将是所有的点。我没有Id列，但是我有两个单独的列中的x和y数据。

  dd<  -  data.frame（Id = c（1,2），X = c（3,5） Y = c（9,6））
 ddTable < -  data.frame（Id = c（1,2），Name = c（Item1，Item2））
 ddShapefile< -  convert.to.shapefile（dd，ddTable，Id，1）
 write.shapefile（ddShapefile，c：/ test，arcgis = T）
  / pre> 
 
 
任何帮助将不胜感激。
解决方案
将建议使用 rgdal 而不是 shapefiles 。为了使用 rgdal ，您必须从 http://cran.revolutionanalytics.com/web/packages/rgdal/ 。
 
 
 
以下代码应该让你在正确的方向：
  install.packages（c（rgdal，sp））
库rgdal）
库（sp）
 MyData<  -  read.csv（file =c：/TheDataIWantToReadIn.csv，header = TRUE，sep =，）
  
以下代码片段来自使用ggplot2包在R中映射。
  class（MyData）＃data.frame 
 coordinates（MyData）<  - 〜longitude + latitude＃无论等价于
＃data.frame 
 class MyData）＃[1]SpatialPointsDataFrame
＃attr（，package）
＃[1]sp
  
以下代码片段来自如何用投影编写shapefile  - 解决问题 
  writeOGR（crest.sp，c：/ test，layer name，driver =ESRI Shapefile）
  
 
I have been trying for the past couple of days to convert a csv to shapefile. I know I can easily do in QGIS or Arc but would like to add this process into my existing R code.

So i can read in the csv with no issues
MyData <- read.csv(file="c:/TheDataIWantToReadIn.csv", header=TRUE, sep=",")
I found the code below from the Packages Shapefile help guide. However I can't seem to find a way for it to work on my code. My rows are each a point, therefore my shapefile I am trying to create will be all points. I don't have an Id column, however I do have x and y data in two separate columns. 
dd <- data.frame(Id=c(1,2),X=c(3,5),Y=c(9,6))
ddTable <- data.frame(Id=c(1,2),Name=c("Item1","Item2"))
ddShapefile <- convert.to.shapefile(dd, ddTable, "Id", 1)
write.shapefile(ddShapefile, "c:/test", arcgis=T)
Any help would be greatly appreciated.
解决方案
I would suggest using rgdal rather than shapefiles. In order to use rgdal, you'll have to check out the system requirements from http://cran.revolutionanalytics.com/web/packages/rgdal/.

The following code should get you in the right direction:
install.packages(c("rgdal", "sp"))
library(rgdal)
library(sp)
MyData <- read.csv(file="c:/TheDataIWantToReadIn.csv", header=TRUE, sep=",")
The following code snippet comes from Mapping in R using the ggplot2 package.
class(MyData) # data.frame
coordinates(MyData)<-~longitude+latitude # whatever the equivalent is in your 
# data.frame
class(MyData) # [1] "SpatialPointsDataFrame"
          # attr(,"package")
          # [1] "sp"
The following code snippet comes How to write a shapefile with projection - problem solved 
writeOGR(crest.sp, "c:/test", "layer name", driver = "ESRI Shapefile")


                        
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