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我打算使用googleway分析澳大利亚人口普查数据以生成热图。

我的方法是使用来自 googleway 的准备好的数据，melbourne其中包含列，并在使用rgdalSA2_NAME转换后将其与人口普查数据中的 ESRI 形状文件连接（代码如下）。问题是多段线的连接并不是唯一的——一些 SA2 区域由多个“子”区域组成。因此，这似乎不是一个好方法。SA2_NAME

更好的方法是将sa2_shape下面的 ESRI 形状数据转换为具有数据格式的折线melbourne。这是怎么做的？

下面的代码生成一个“桥接”数据框，用于将melbourne数据googleway与具有SA2_MAIN作为关键字段的 ABS 数据连接起来 - 如上所述，这种“hack”方法的问题在于折线不是唯一的SA2_NAME

library(tidyverse)
library(googleway)
library(rgdal)

shape_path <- "abs_data/sa2_esri_shapefile"
shape_file <- "SA2_2016_AUST"
sa2_shape <- readOGR(shape_path, shape_file)
sa2_df <- data.frame(sa2_shape$SA2_MAIN, sa2_shape$SA2_NAME)
names(sa2_df) <- c("SA2_MAIN", "SA2_NAME")
sa2_df <- sa2_df %>% semi_join(melbourne, by = "SA2_NAME")
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1 回答 1

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根据 SymbolixAU 评论 - 用于sf加载数据，只要geometry不是空列表，它就可以工作 - 请参见下面的代码。

library(tidyverse)
library(googleway)
library(sf)

shape_path <- "abs_data/sa2_esri_shapefile"
shape_file <- "SA2_2016_AUST"

shape_file_path <- paste0(shape_path, "/", shape_file, '.shp')
sa2_shape <- sf::st_read(shape_file_path)
sa2_shape <- sa2_shape %>% 
  filter(STATE_NAME == "Victoria",
         AREA_SQKM > 0)# This is important - otherwise google_map() will crash!
google_map() %>% 
  googleway::add_polygons(data = sa2_shape, 
                          polyline = "geometry", 
                          fill_colour = "SA2_NAME")

维多利亚 SA2 地图

> sa2_shape %>% head()
Simple feature collection with 6 features and 6 fields
geometry type:  MULTIPOLYGON
dimension:      XY
bbox:           xmin: 143.6849 ymin: -37.68153 xmax: 143.951 ymax: -37.46847
epsg (SRID):    4283
proj4string:    +proj=longlat +ellps=GRS80 +towgs84=0,0,0,0,0,0,0 +no_defs
   SA2_MAIN SA2_MAIN16         SA2_NAME STATE_CODE STATE_NAME AREA_SQKM                       geometry
1 201011001  201011001        Alfredton          2   Victoria   52.7111 MULTIPOLYGON (((143.7072 -3...
2 201011002  201011002         Ballarat          2   Victoria   12.3787 MULTIPOLYGON (((143.8675 -3...
3 201011003  201011003 Ballarat - North          2   Victoria   92.3577 MULTIPOLYGON (((143.853 -37...
4 201011004  201011004 Ballarat - South          2   Victoria   32.8541 MULTIPOLYGON (((143.8675 -3...
5 201011005  201011005        Buninyong          2   Victoria   51.5855 MULTIPOLYGON (((143.8533 -3...
6 201011006  201011006        Delacombe          2   Victoria   34.1608 MULTIPOLYGON (((143.7072 -3...
于 2018-08-29T13:08:16.903 回答