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如何使用geom_sf繪制PostGIS幾何圖形？

[英]How do I plot PostGIS geometries using geom_sf?

 原文  2018-03-21 17:36:07  0   1    r/ ggplot2/ postgis/ spatial

問題描述

數據源是具有PostGIS幾何類型的PostgreSQL數據庫。 使用RPostgreSQL包將我想要的數據直接從SQL查詢到data.frame中，我沒有問題。

由於R抱怨原始幾何類型，因此我在SQL查詢中對幾何使用ST_AsText() ，以便將它們作為character類型存儲在data.frame 。 我有三種類型： POINT ， LINESTRING和POLYGON 。 請注意，我的數據是幾何形狀（例如，笛卡爾x，y，z坐標），而不是地圖投影的地理。

制作MWE時遇到了一些麻煩，因為我必須用換行符分隔每個LINESTRING和POLYGON元素，否則以為我缺少括號。 可能是錯誤？ 無論如何，這是MWE： 

tmpdf <- data.frame(id = seq(1,6,1),
                point = c("POINT(-186.552366 -69.56887)","POINT(151.826334 -19.119682)","POINT(-189.013302 -67.107934)","POINT(-195.575798 59.220114)","POINT(103.01777 62.501362)","POINT(135.009938 55.118554)"),
                linestr = c("LINESTRING(186.547856450189 -46.4485209972227,182.523886136587 -87.3045772259105,170.606614118262 -126.59055812607,151.254014475596 -162.79672548354,125.209796759794 -194.531696591426,93.4748256519081 -220.575914307228,65.3272038227373 -235.621131625452,36.2687622716732 -244.435913500765,-9.05803921416017 -248.900213788796,-54.3848406999935 -244.435913500765,-97.9697586242894 -231.214573193132,-138.137849033921 -209.744281559306,-173.34547474097 -180.850129866096,-202.239626434179 -145.642504159047,-221.510885247941 -109.588514788964,-228.270643805406 -87.3045772259111,-232.294614119009 -46.4485209972234,-228.270643805406 -5.59246476853568,-216.353371787081 33.6935161316239,-197.000772144416 69.8996834890942,-170.956554428614 101.63465459698,-139.221583320728 127.678872312782,-103.015415963258 147.031471955448,-63.7294350630982 158.948743973773,-22.8733788344104 162.972714287376,17.9826773942774 158.948743973774,57.2686582944371 147.031471955449,93.4748256519074 127.678872312783,125.209796759793 101.634654596981,151.254014475596 69.8996834890953,170.606614118262 33.6935161316251,182.523886136587 -5.59246476853451,186.547856450189 -46.4485209972227)",
                            "LINESTRING(186.547856450189 -46.4485209972227,182.523886136587 -87.3045772259105,170.606614118262 -126.59055812607,151.254014475596 -162.79672548354,125.209796759794 -194.531696591426,93.4748256519081 -220.575914307228,65.3272038227373 -235.621131625452,36.2687622716732 -244.435913500765,-9.05803921416017 -248.900213788796,-54.3848406999935 -244.435913500765,-97.9697586242894 -231.214573193132,-138.137849033921 -209.744281559306,-173.34547474097 -180.850129866096,-202.239626434179 -145.642504159047,-221.510885247941 -109.588514788964,-228.270643805406 -87.3045772259111,-232.294614119009 -46.4485209972234,-228.270643805406 -5.59246476853568,-216.353371787081 33.6935161316239,-197.000772144416 69.8996834890942,-170.956554428614 101.63465459698,-139.221583320728 127.678872312782,-103.015415963258 147.031471955448,-63.7294350630982 158.948743973773,-22.8733788344104 162.972714287376,17.9826773942774 158.948743973774,57.2686582944371 147.031471955449,93.4748256519074 127.678872312783,125.209796759793 101.634654596981,151.254014475596 69.8996834890953,170.606614118262 33.6935161316251,182.523886136587 -5.59246476853451,186.547856450189 -46.4485209972227)",
                            "LINESTRING(186.547856450189 -46.4485209972227,182.523886136587 -87.3045772259105,170.606614118262 -126.59055812607,151.254014475596 -162.79672548354,125.209796759794 -194.531696591426,93.4748256519081 -220.575914307228,65.3272038227373 -235.621131625452,36.2687622716732 -244.435913500765,-9.05803921416017 -248.900213788796,-54.3848406999935 -244.435913500765,-97.9697586242894 -231.214573193132,-138.137849033921 -209.744281559306,-173.34547474097 -180.850129866096,-202.239626434179 -145.642504159047,-221.510885247941 -109.588514788964,-228.270643805406 -87.3045772259111,-232.294614119009 -46.4485209972234,-228.270643805406 -5.59246476853568,-216.353371787081 33.6935161316239,-197.000772144416 69.8996834890942,-170.956554428614 101.63465459698,-139.221583320728 127.678872312782,-103.015415963258 147.031471955448,-63.7294350630982 158.948743973773,-22.8733788344104 162.972714287376,17.9826773942774 158.948743973774,57.2686582944371 147.031471955449,93.4748256519074 127.678872312783,125.209796759793 101.634654596981,151.254014475596 69.8996834890953,170.606614118262 33.6935161316251,182.523886136587 -5.59246476853451,186.547856450189 -46.4485209972227)",
                            "LINESTRING(186.547856450189 -46.4485209972227,182.523886136587 -87.3045772259105,170.606614118262 -126.59055812607,151.254014475596 -162.79672548354,125.209796759794 -194.531696591426,93.4748256519081 -220.575914307228,65.3272038227373 -235.621131625452,36.2687622716732 -244.435913500765,-9.05803921416017 -248.900213788796,-54.3848406999935 -244.435913500765,-97.9697586242894 -231.214573193132,-138.137849033921 -209.744281559306,-173.34547474097 -180.850129866096,-202.239626434179 -145.642504159047,-221.510885247941 -109.588514788964,-228.270643805406 -87.3045772259111,-232.294614119009 -46.4485209972234,-228.270643805406 -5.59246476853568,-216.353371787081 33.6935161316239,-197.000772144416 69.8996834890942,-170.956554428614 101.63465459698,-139.221583320728 127.678872312782,-103.015415963258 147.031471955448,-63.7294350630982 158.948743973773,-22.8733788344104 162.972714287376,17.9826773942774 158.948743973774,57.2686582944371 147.031471955449,93.4748256519074 127.678872312783,125.209796759793 101.634654596981,151.254014475596 69.8996834890953,170.606614118262 33.6935161316251,182.523886136587 -5.59246476853451,186.547856450189 -46.4485209972227)",
                            "LINESTRING(186.547856450189 -46.4485209972227,182.523886136587 -87.3045772259105,170.606614118262 -126.59055812607,151.254014475596 -162.79672548354,125.209796759794 -194.531696591426,93.4748256519081 -220.575914307228,65.3272038227373 -235.621131625452,36.2687622716732 -244.435913500765,-9.05803921416017 -248.900213788796,-54.3848406999935 -244.435913500765,-97.9697586242894 -231.214573193132,-138.137849033921 -209.744281559306,-173.34547474097 -180.850129866096,-202.239626434179 -145.642504159047,-221.510885247941 -109.588514788964,-228.270643805406 -87.3045772259111,-232.294614119009 -46.4485209972234,-228.270643805406 -5.59246476853568,-216.353371787081 33.6935161316239,-197.000772144416 69.8996834890942,-170.956554428614 101.63465459698,-139.221583320728 127.678872312782,-103.015415963258 147.031471955448,-63.7294350630982 158.948743973773,-22.8733788344104 162.972714287376,17.9826773942774 158.948743973774,57.2686582944371 147.031471955449,93.4748256519074 127.678872312783,125.209796759793 101.634654596981,151.254014475596 69.8996834890953,170.606614118262 33.6935161316251,182.523886136587 -5.59246476853451,186.547856450189 -46.4485209972227)",
                            "LINESTRING(186.547856450189 -46.4485209972227,182.523886136587 -87.3045772259105,170.606614118262 -126.59055812607,151.254014475596 -162.79672548354,125.209796759794 -194.531696591426,93.4748256519081 -220.575914307228,65.3272038227373 -235.621131625452,36.2687622716732 -244.435913500765,-9.05803921416017 -248.900213788796,-54.3848406999935 -244.435913500765,-97.9697586242894 -231.214573193132,-138.137849033921 -209.744281559306,-173.34547474097 -180.850129866096,-202.239626434179 -145.642504159047,-221.510885247941 -109.588514788964,-228.270643805406 -87.3045772259111,-232.294614119009 -46.4485209972234,-228.270643805406 -5.59246476853568,-216.353371787081 33.6935161316239,-197.000772144416 69.8996834890942,-170.956554428614 101.63465459698,-139.221583320728 127.678872312782,-103.015415963258 147.031471955448,-63.7294350630982 158.948743973773,-22.8733788344104 162.972714287376,17.9826773942774 158.948743973774,57.2686582944371 147.031471955449,93.4748256519074 127.678872312783,125.209796759793 101.634654596981,151.254014475596 69.8996834890953,170.606614118262 33.6935161316251,182.523886136587 -5.59246476853451,186.547856450189 -46.4485209972227)"),
                polygon = c("POLYGON((186.547856450189 -46.4485209972227,182.523886136587 -87.3045772259105,170.606614118262 -126.59055812607,151.254014475596 -162.79672548354,125.209796759794 -194.531696591426,93.4748256519081 -220.575914307228,65.3272038227373 -235.621131625452,36.2687622716732 -244.435913500765,-9.05803921416017 -248.900213788796,-54.3848406999935 -244.435913500765,-97.9697586242894 -231.214573193132,-138.137849033921 -209.744281559306,-173.34547474097 -180.850129866096,-202.239626434179 -145.642504159047,-221.510885247941 -109.588514788964,-228.270643805406 -87.3045772259111,-232.294614119009 -46.4485209972234,-228.270643805406 -5.59246476853568,-216.353371787081 33.6935161316239,-197.000772144416 69.8996834890942,-170.956554428614 101.63465459698,-139.221583320728 127.678872312782,-103.015415963258 147.031471955448,-63.7294350630982 158.948743973773,-22.8733788344104 162.972714287376,17.9826773942774 158.948743973774,57.2686582944371 147.031471955449,93.4748256519074 127.678872312783,125.209796759793 101.634654596981,151.254014475596 69.8996834890953,170.606614118262 33.6935161316251,182.523886136587 -5.59246476853451,186.547856450189 -46.4485209972227))", 
                            "POLYGON((186.547856450189 -46.4485209972227,182.523886136587 -87.3045772259105,170.606614118262 -126.59055812607,151.254014475596 -162.79672548354,125.209796759794 -194.531696591426,93.4748256519081 -220.575914307228,65.3272038227373 -235.621131625452,36.2687622716732 -244.435913500765,-9.05803921416017 -248.900213788796,-54.3848406999935 -244.435913500765,-97.9697586242894 -231.214573193132,-138.137849033921 -209.744281559306,-173.34547474097 -180.850129866096,-202.239626434179 -145.642504159047,-221.510885247941 -109.588514788964,-228.270643805406 -87.3045772259111,-232.294614119009 -46.4485209972234,-228.270643805406 -5.59246476853568,-216.353371787081 33.6935161316239,-197.000772144416 69.8996834890942,-170.956554428614 101.63465459698,-139.221583320728 127.678872312782,-103.015415963258 147.031471955448,-63.7294350630982 158.948743973773,-22.8733788344104 162.972714287376,17.9826773942774 158.948743973774,57.2686582944371 147.031471955449,93.4748256519074 127.678872312783,125.209796759793 101.634654596981,151.254014475596 69.8996834890953,170.606614118262 33.6935161316251,182.523886136587 -5.59246476853451,186.547856450189 -46.4485209972227))",
                            "POLYGON((186.547856450189 -46.4485209972227,182.523886136587 -87.3045772259105,170.606614118262 -126.59055812607,151.254014475596 -162.79672548354,125.209796759794 -194.531696591426,93.4748256519081 -220.575914307228,65.3272038227373 -235.621131625452,36.2687622716732 -244.435913500765,-9.05803921416017 -248.900213788796,-54.3848406999935 -244.435913500765,-97.9697586242894 -231.214573193132,-138.137849033921 -209.744281559306,-173.34547474097 -180.850129866096,-202.239626434179 -145.642504159047,-221.510885247941 -109.588514788964,-228.270643805406 -87.3045772259111,-232.294614119009 -46.4485209972234,-228.270643805406 -5.59246476853568,-216.353371787081 33.6935161316239,-197.000772144416 69.8996834890942,-170.956554428614 101.63465459698,-139.221583320728 127.678872312782,-103.015415963258 147.031471955448,-63.7294350630982 158.948743973773,-22.8733788344104 162.972714287376,17.9826773942774 158.948743973774,57.2686582944371 147.031471955449,93.4748256519074 127.678872312783,125.209796759793 101.634654596981,151.254014475596 69.8996834890953,170.606614118262 33.6935161316251,182.523886136587 -5.59246476853451,186.547856450189 -46.4485209972227))",
                            "POLYGON((186.547856450189 -46.4485209972227,182.523886136587 -87.3045772259105,170.606614118262 -126.59055812607,151.254014475596 -162.79672548354,125.209796759794 -194.531696591426,93.4748256519081 -220.575914307228,65.3272038227373 -235.621131625452,36.2687622716732 -244.435913500765,-9.05803921416017 -248.900213788796,-54.3848406999935 -244.435913500765,-97.9697586242894 -231.214573193132,-138.137849033921 -209.744281559306,-173.34547474097 -180.850129866096,-202.239626434179 -145.642504159047,-221.510885247941 -109.588514788964,-228.270643805406 -87.3045772259111,-232.294614119009 -46.4485209972234,-228.270643805406 -5.59246476853568,-216.353371787081 33.6935161316239,-197.000772144416 69.8996834890942,-170.956554428614 101.63465459698,-139.221583320728 127.678872312782,-103.015415963258 147.031471955448,-63.7294350630982 158.948743973773,-22.8733788344104 162.972714287376,17.9826773942774 158.948743973774,57.2686582944371 147.031471955449,93.4748256519074 127.678872312783,125.209796759793 101.634654596981,151.254014475596 69.8996834890953,170.606614118262 33.6935161316251,182.523886136587 -5.59246476853451,186.547856450189 -46.4485209972227))",
                            "POLYGON((186.547856450189 -46.4485209972227,182.523886136587 -87.3045772259105,170.606614118262 -126.59055812607,151.254014475596 -162.79672548354,125.209796759794 -194.531696591426,93.4748256519081 -220.575914307228,65.3272038227373 -235.621131625452,36.2687622716732 -244.435913500765,-9.05803921416017 -248.900213788796,-54.3848406999935 -244.435913500765,-97.9697586242894 -231.214573193132,-138.137849033921 -209.744281559306,-173.34547474097 -180.850129866096,-202.239626434179 -145.642504159047,-221.510885247941 -109.588514788964,-228.270643805406 -87.3045772259111,-232.294614119009 -46.4485209972234,-228.270643805406 -5.59246476853568,-216.353371787081 33.6935161316239,-197.000772144416 69.8996834890942,-170.956554428614 101.63465459698,-139.221583320728 127.678872312782,-103.015415963258 147.031471955448,-63.7294350630982 158.948743973773,-22.8733788344104 162.972714287376,17.9826773942774 158.948743973774,57.2686582944371 147.031471955449,93.4748256519074 127.678872312783,125.209796759793 101.634654596981,151.254014475596 69.8996834890953,170.606614118262 33.6935161316251,182.523886136587 -5.59246476853451,186.547856450189 -46.4485209972227))",
                            "POLYGON((186.547856450189 -46.4485209972227,182.523886136587 -87.3045772259105,170.606614118262 -126.59055812607,151.254014475596 -162.79672548354,125.209796759794 -194.531696591426,93.4748256519081 -220.575914307228,65.3272038227373 -235.621131625452,36.2687622716732 -244.435913500765,-9.05803921416017 -248.900213788796,-54.3848406999935 -244.435913500765,-97.9697586242894 -231.214573193132,-138.137849033921 -209.744281559306,-173.34547474097 -180.850129866096,-202.239626434179 -145.642504159047,-221.510885247941 -109.588514788964,-228.270643805406 -87.3045772259111,-232.294614119009 -46.4485209972234,-228.270643805406 -5.59246476853568,-216.353371787081 33.6935161316239,-197.000772144416 69.8996834890942,-170.956554428614 101.63465459698,-139.221583320728 127.678872312782,-103.015415963258 147.031471955448,-63.7294350630982 158.948743973773,-22.8733788344104 162.972714287376,17.9826773942774 158.948743973774,57.2686582944371 147.031471955449,93.4748256519074 127.678872312783,125.209796759793 101.634654596981,151.254014475596 69.8996834890953,170.606614118262 33.6935161316251,182.523886136587 -5.59246476853451,186.547856450189 -46.4485209972227))"), stringsAsFactors = F)

所有點都不同，線串都相同，多邊形都相同（並且與線串相同，只是作為多邊形）。

現在，我想使用ggplot可視化這些幾何。

我希望使用ggplot的“簡單功能”方面（請參閱geom_sf ），但是它似乎已被棄用或尚未實現。 我確實看到了對geom_sf的引用，但它似乎仍在開發中……

geom_map和geom_polygon都需要x和y變量。 是否有從幾何WKT對象提取x和y坐標的快速方法？

1 個解決方案

解決方案1
 0 已采納  2018-03-21 17:36:07

這是有點簡單的繪制與幾何ggplot2 （但不使用geom_sf ）如果您使用的轉換WKT到SpatialPoints / SpatialPolygons和提取坐標一些額外的庫： 

library(rgeos)
library(sp)

# read WKT points into spatial object
tmpdf$pts <- lapply(tmpdf$point, FUN = function(x) readWKT(x))

# extract point coordinates
tmpdf$ptx <- coordinates(tmpdf$pts)[c(T,F)]
tmpdf$pty <- coordinates(tmpdf$pts)[c(F,T)]

ggplot(tmpdf) + 
  geom_point(aes(x=ptx, y=pty))

雖然還不清楚如何從多邊形對象中提取坐標，但是我能夠做到的唯一方法似乎很笨拙。 一個問題是函數沒有向量化，因此它們都需要使用apply函數進行包裝。 

# read WKT polygons into spatial object
tmpdf$pol <- lapply(tmpdf$polygon, FUN = function(x) readWKT(x))

# extract coordinates from the first polygon only
test <- tmpdf[1,"pol"]
test2 <- sapply(test, FUN=function(x) x@polygons)
test3 <- sapply(test2, FUN=function(x) x@Polygons)
test4 <- lapply(test3, FUN=function(x) x@coords)

ggplot() + 
  geom_point(data=tmpdf, aes(x=ptx, y=pty)) +
  geom_polygon(data=data.frame(test4[[1]]), aes(x=x, y=y), fill="transparent", color="blue")

ggplot2中的點和多邊形

上面的方法僅適用於我知道每個多邊形都是等效的。 我必須做更多的工作才能弄清楚如何對不同的多邊形執行此操作。

****更新！

經過反復試驗，我能夠成功使用geom_sf 。 此頁面上的功能非常有幫助。 

# install the dev version of ggplot2 (2.2.1.9000)
devtools::install_github("tidyverse/ggplot2")

# convert wkt to spatial (sf)
tmpdf$sppt <- st_as_sfc(tmpdf$point)
tmpdf$spls <- st_as_sfc(tmpdf$linestr)
tmpdf$sppg <- st_as_sfc(tmpdf$polygon) 

# regular plotting works
plot(tmpdf$sppt)
plot(tmpdf$spls)
plot(tmpdf$sppg)

# ggplot too!
ggplot(tmpdf) + 
  geom_sf(aes(geometry=sppt))

geom_sf解決方案

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