R googleway与ABS人口普查数据

Question

我打算使用census data分析澳大利亚人googleway来产生热图。

我的方法是使用包含melbourne列的googleway SA2_NAME中准备好的数据，并在将rgdal转换后，将其与普查数据中的ESRI shape文件结合起来（以下代码） 。问题在于，对于多段线来说，通过SA2_NAME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。

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

下面的代码生成一个“桥接”数据帧，用于将melbourne中的googleway数据与具有SA2_MAIN作为关键字段的ABS数据相结合-如上所述，这种“ hack”方法是折线不是SA2_NAME

唯一的

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")

Answer 1

根据SymbolixAU注释-使用sf加载数据，并且只要geometry不是一个空列表，此方法就起作用-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")

> 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...