fortify()之后如何从shapefile中保留信息 [英] How keep information from shapefile after fortify()
问题描述
如何在shapefile之后保留多边形的信息?让我尝试解释一下:
How can I keep polygons's information after shapefile? Let me try to explain:
我有一个带有此数据的shapefile:
I have a shapefile with this data:
> head(mapa@data)
ID CD_GEOCODI TIPO CD_GEOCODB NM_BAIRRO CD_GEOCODS NM_SUBDIST CD_GEOCODD NM_DISTRIT CD_GEOCODM NM_MUNICIP NM_MICRO NM_MESO
12228 33679 431490205000133 URBANO 431490205003 Cidade Baixa 43149020500 <NA> 431490205 PORTO ALEGRE 4314902 PORTO ALEGRE PORTO ALEGRE METROPOLITANA DE PORTO ALEGRE
12229 33680 431490205000134 URBANO 431490205003 Cidade Baixa 43149020500 <NA> 431490205 PORTO ALEGRE 4314902 PORTO ALEGRE PORTO ALEGRE METROPOLITANA DE PORTO ALEGRE
12230 33681 431490205000135 URBANO 431490205003 Cidade Baixa 43149020500 <NA> 431490205 PORTO ALEGRE 4314902 PORTO ALEGRE PORTO ALEGRE METROPOLITANA DE PORTO ALEGRE
12231 33682 431490205000136 URBANO 431490205003 Cidade Baixa 43149020500 <NA> 431490205 PORTO ALEGRE 4314902 PORTO ALEGRE PORTO ALEGRE METROPOLITANA DE PORTO ALEGRE
12232 33683 431490205000137 URBANO 431490205003 Cidade Baixa 43149020500 <NA> 431490205 PORTO ALEGRE 4314902 PORTO ALEGRE PORTO ALEGRE METROPOLITANA DE PORTO ALEGRE
12233 33684 431490205000138 URBANO 431490205003 Cidade Baixa 43149020500 <NA> 431490205 PORTO ALEGRE 4314902 PORTO ALEGRE PORTO ALEGRE METROPOLITANA DE PORTO ALEGRE
和此数据:
> head(data)
CD_GEOCODI Population
1 431490205000133 1272
2 431490205000134 822
3 431490205000135 1085
4 431490205000136 1454
5 431490205000137 964
6 431490205000138 834
我可以只合并data
和mapa@data
并用plot()
进行绘制,但是我想使用ggplot2.但是fortify()
的输出没有任何原始变量.例如:
I could just merge data
and mapa@data
and plot it with plot()
, but I want use ggplot2. But fortify()
's output donsn't have any of originals variables. For example:
> head(fortify(mapa))
Regions defined for each Polygons
long lat order hole piece group id
1 -51.22254 -30.03526 1 FALSE 1 12228.1 12228
2 -51.22332 -30.03648 2 FALSE 1 12228.1 12228
3 -51.22365 -30.03702 3 FALSE 1 12228.1 12228
4 -51.22482 -30.03610 4 FALSE 1 12228.1 12228
5 -51.22488 -30.03606 5 FALSE 1 12228.1 12228
6 -51.22476 -30.03591 6 FALSE 1 12228.1 12228
两者(fortify和mapa @ data)都有一个id变量,但值不相同.所以,我的问题再次是:如何将mapa@data
的信息传递到fortify()
的输出(或另一个允许使用ggplot2的函数)
Both (fortify and mapa@data) have an id variable, but aren't the same values. So, again, my question is: How can I pass mapa@data
's information to fortify()
's output (or another function that allows use ggplot2)
推荐答案
由于您未提供shapefile或数据,因此无法进行测试,但这样的方法应该可以工作:
Since you did not provide your shapefile or data, it's impossible to test, but something like this should work:
# not tested...
library(plyr) # for join(...)
library(rgdal) # for readOGR(...)
library(ggplot2) # for fortify(...)
mapa <- readOGR(dsn=".",layer="shapefile name w/o .shp extension")
map@data$id <- rownames(mapa@data)
mapa@data <- join(mapa@data, data, by="CD_GEOCODI")
mapa.df <- fortify(mapa)
mapa.df <- join(mapa.df,mapa@data, by="id")
ggplot(mapa.df, aes(x=long, y=lat, group=group))+
geom_polygon(aes(fill=Population))+
coord_fixed()
这篇关于fortify()之后如何从shapefile中保留信息的文章就介绍到这了,希望我们推荐的答案对大家有所帮助,也希望大家多多支持IT屋!