转换一个来自Eurostat的geojson文件为数据框,并绘制地图。

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英文:

Convert a geojson file to data.frame (from Eurostat) and make a map

问题

我试图使用geojsoniobroom包将Eurostat的geojson文件链接转换为数据框,但是当使用broom::tidy()函数将文件转换为数据框时,许多geojson文件中的列未被转换,并且当我使用ggplot创建地图时,地图显示不正确。我需要将geojson转换为数据框。

有一种方法可以使用eurostat包从Eurostat获取将geojson数据转换为dataframe,但问题是eurostat函数get_eurostat_geospatial()只能获取欧洲的地图数据,而我需要世界地图 - Eurostat有世界地图,但无法使用get_eurostat_geospatial()检索。

**我的问题是:**如何高效地将geojson文件转换为数据框并保留geojson中的所有要素?

这是我根据get_eurostat_geospatial()函数所需的格式:

library(eurostat)

map = get_eurostat_geospatial(output_class = "df", resolution = 20, nuts_level = 0, year = 2016, crs = "4326")

这是我用于将geojson转换为数据框并生成地图但未成功的代码:

library(tidyverse)
library(broom)
library(geojsonio)

file = "GEOJSON文件的路径/CNTR_BN_20M_2020_4326.shp"

df = geojson_read(file, what = "sp")
df_tidy = tidy(df)    

ggplot() +
  geom_polygon(data = df_tidy, aes(x=long, y=lat, group=group))

转换一个来自Eurostat的geojson文件为数据框,并绘制地图。

英文:

I am trying to convert an Eurostat's geojson file here to a dataframe using packages geojsonio and broom, but when the file is converted into the dataframe using the broom::tidy() function many of the columns in the geojson file are not converted and when I create a map with ggplot the map is not correct. I need the geojson to be in a dataframe.

There's a way of getting geojson data converted into a dataframe from Eurostat with eurostat package, but the problem is that the eurostat function get_eurostat_geospatial() only gets map data for Europe and I need the world map - Eurostat has the world map, but is not retreivable using get_eurostat_geospatial().

My question is: how can I efficiently convert a geojson file into a dataframe and keep all features in the geojson?

This the format I need, based on get_eurostat_geospatial()function:

library(eurostat)

map = get_eurostat_geospatial(output_class = "df", resolution = 20, nuts_level = 0, year = 2016, crs = "4326")

# A tibble: 6,588 × 17
    long   lat order hole  piece group id    NUTS_ID LEVL_CODE CNTR_CODE NAME_LATN NUTS_NAME MOUNT_TYPE URBN_TYPE COAST_TYPE FID  
   <dbl> <dbl> <int> <lgl> <fct> <fct> <chr> <chr>       <int> <chr>     <chr>     <chr>          <int>     <int>      <int> <chr>
 1 -7.03  43.5     1 FALSE 1     1.1   1     ES              0 ES        ESPAÑA    ESPAÑA             0         0          0 ES   
 2 -6.29  43.6     2 FALSE 1     1.1   1     ES              0 ES        ESPAÑA    ESPAÑA             0         0          0 ES 

And his is the code I am using to convert the geojson to dataframe and produce the map without success:

library(tidyverse)
library(broom)
library(geojsonio)

file = "LOCATION OF THE GEOJSON FILE/CNTR_BN_20M_2020_4326.shp"

df = geojson_read(file, what = "sp")
df_tidy = tidy(df)    

ggplot() +
  geom_polygon(data = df_tidy, aes(x=long, y=lat, group=group))

转换一个来自Eurostat的geojson文件为数据框,并绘制地图。

答案1

得分: 2

对于地理空间数据,你可能想要使用sf,ggplot通过geom_sf()层支持它。sf对象可以像常规数据框一样处理(使用或不使用dplyr进行连接/过滤/分组/变异),它支持GeoJSON和Shapefile等其他地理空间文件格式。如果要从Eurostat获取世界地图,你可以使用giscoR包,它还提供gisco_get_nuts()来获取NUTS地区。或者直接使用sf::st_read()来读取你的shp和geojson文件。

library(sf)
library(ggplot2)
library(tibble)

# /vsicurl/ enables caching, feel free to use it with plain https://.. URIs
nuts <- st_read("/vsicurl/https://gisco-services.ec.europa.eu/distribution/v2/nuts/geojson/NUTS_BN_60M_2021_4326.geojson")
as_tibble(nuts)
#> # A tibble: 5,074 × 9
#>    EU_FLAG EFTA_FLAG CC_FLAG LEVL_CODE NUTS_BN_ID COAS_FLAG OTHR_FLAG   FID
#>    <chr>   <chr>     <chr>       <int>      <int> <chr>     <chr>     <int>
#>  1 T       F         F               0        155 T         F           155
#>  2 T       F         F               3        156 F         F           156
#>  3 T       F         F               3        157 F         F           157
#>  4 T       F         F               0        158 T         F           158
#>  5 T       F         F               0        159 T         F           159
#>  6 T       F         F               3        160 F         F           160
#>  7 F       F         T               1        161 F         F           161
#>  8 T       F         F               3        162 F         F           162
#>  9 T       F         F               3        163 F         F           163
#> 10 F       F         T               0        164 F         T           164
#> # … with 5,064 more rows, and 1 more variable: geometry <LINESTRING [°]>

p_nuts <- ggplot(nuts) +
  geom_sf(linewidth = .1) +
  labs(caption = "NUTS_BN_60M_2021_4326.geojson") +
  theme_bw()


# countries from giscoR 
world <- giscoR::gisco_get_countries()
tibble::as_tibble(world)
#> # A tibble: 257 × 6
#>    CNTR_ID NAME_ENGL            ISO3_C…¹ CNTR…² FID                    geometry
#>    <chr>   <chr>                <chr>    <chr>   <chr>            <GEOMETRY [°]>
#>  1 AR      Argentina            ARG      Argent… AR    MULTIPOLYGON (((-62.6452…
#>  2 AS      American Samoa       ASM      Americ… AS    MULTIPOLYGON (((-170.628…
#>  3 AT      Austria              AUT      Österr… AT    POLYGON ((16.94028 48.61…
#>  4 AQ      Antarctica           ATA      Antarc… AQ    MULTIPOLYGON (((-57.1760…
#>  5 AD      Andorra              AND      Andorra AD    POLYGON ((1.7258 42.5044…
#>  6 AE      United Arab Emirates ARE      الإمار… AE    MULTIPOLYGON (((56.37424…
#>  7 AF      Afghanistan          AFG      افغانس… AF    POLYGON ((74.88986 37.23…
#>  8 AG      Antigua and Barbuda  ATG      Antigu… AG    MULTIPOLYGON (((-61.6902…
#>  9 AI      Anguilla             AIA      Anguil… AI    POLYGON ((-63.09693 18.1…
#> 10 AL      Albania              ALB      Shqip… AL    POLYGON ((20.0763 42.555…
#> # … with 247 more rows, and abbreviated variable names ¹ISO3_CODE, ²CNTR_NAME

p_world <- ggplot(world) +
  geom_sf() +
  labs(caption = "giscoR::gisco_get_countries()") +
  theme_bw()

patchwork::wrap_plots(p_nuts, p_world)

转换一个来自Eurostat的geojson文件为数据框,并绘制地图。

创建于2023年02月23日,使用reprex v2.0.2

英文:

For geospatial data you'd probably want sf, ggplot supports it through geom_sf() layer. sf object can be handled as regular data.frames (joining / filtering / grouping / mutating with or without dplyr) and it supports both GeoJSON and Shapefile among other geospatial file formats. For fetching world map from Eurostat you can use giscoR package, it also provides gisco_get_nuts() for NUTS regions. Or use sf::st_read() directly on your shp and geojson files.

library(sf)
library(ggplot2)
library(tibble)

# /vsicurl/ enables caching, feel free to use it with plain https://.. URIs
nuts &lt;- st_read(&quot;/vsicurl/https://gisco-services.ec.europa.eu/distribution/v2/nuts/geojson/NUTS_BN_60M_2021_4326.geojson&quot;)
as_tibble(nuts)
#&gt; # A tibble: 5,074 &#215; 9
#&gt;    EU_FLAG EFTA_FLAG CC_FLAG LEVL_CODE NUTS_BN_ID COAS_FLAG OTHR_FLAG   FID
#&gt;    &lt;chr&gt;   &lt;chr&gt;     &lt;chr&gt;       &lt;int&gt;      &lt;int&gt; &lt;chr&gt;     &lt;chr&gt;     &lt;int&gt;
#&gt;  1 T       F         F               0        155 T         F           155
#&gt;  2 T       F         F               3        156 F         F           156
#&gt;  3 T       F         F               3        157 F         F           157
#&gt;  4 T       F         F               0        158 T         F           158
#&gt;  5 T       F         F               0        159 T         F           159
#&gt;  6 T       F         F               3        160 F         F           160
#&gt;  7 F       F         T               1        161 F         F           161
#&gt;  8 T       F         F               3        162 F         F           162
#&gt;  9 T       F         F               3        163 F         F           163
#&gt; 10 F       F         T               0        164 F         T           164
#&gt; # … with 5,064 more rows, and 1 more variable: geometry &lt;LINESTRING [&#176;]&gt;

p_nuts &lt;- ggplot(nuts) +
  geom_sf(linewidth = .1) +
  labs(caption = &quot;NUTS_BN_60M_2021_4326.geojson&quot;) +
  theme_bw()


# countries from giscoR 
world &lt;- giscoR::gisco_get_countries()
tibble::as_tibble(world)
#&gt; # A tibble: 257 &#215; 6
#&gt;    CNTR_ID NAME_ENGL            ISO3_C…&#185; CNTR_…&#178; FID                    geometry
#&gt;    &lt;chr&gt;   &lt;chr&gt;                &lt;chr&gt;    &lt;chr&gt;   &lt;chr&gt;            &lt;GEOMETRY [&#176;]&gt;
#&gt;  1 AR      Argentina            ARG      Argent… AR    MULTIPOLYGON (((-62.6452…
#&gt;  2 AS      American Samoa       ASM      Americ… AS    MULTIPOLYGON (((-170.628…
#&gt;  3 AT      Austria              AUT      &#214;sterr… AT    POLYGON ((16.94028 48.61…
#&gt;  4 AQ      Antarctica           ATA      Antarc… AQ    MULTIPOLYGON (((-57.1760…
#&gt;  5 AD      Andorra              AND      Andorra AD    POLYGON ((1.7258 42.5044…
#&gt;  6 AE      United Arab Emirates ARE      الإمار… AE    MULTIPOLYGON (((56.37424…
#&gt;  7 AF      Afghanistan          AFG      افغانس… AF    POLYGON ((74.88986 37.23…
#&gt;  8 AG      Antigua and Barbuda  ATG      Antigu… AG    MULTIPOLYGON (((-61.6902…
#&gt;  9 AI      Anguilla             AIA      Anguil… AI    POLYGON ((-63.09693 18.1…
#&gt; 10 AL      Albania              ALB      Shqip&#235;… AL    POLYGON ((20.0763 42.555…
#&gt; # … with 247 more rows, and abbreviated variable names &#185;​ISO3_CODE, &#178;​CNTR_NAME

p_world &lt;- ggplot(world) +
  geom_sf() +
  labs(caption = &quot;giscoR::gisco_get_countries()&quot;) +
  theme_bw()

patchwork::wrap_plots(p_nuts, p_world)

转换一个来自Eurostat的geojson文件为数据框,并绘制地图。<!-- -->

<sup>Created on 2023-02-23 with reprex v2.0.2</sup>

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  • 本文由 发表于 2023年2月24日 01:51:11
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