Created
March 3, 2023 13:27
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Census data for bespoke geographies
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| # Returning Census data for custom geographies # | |
| # Load packages --------------------- | |
| library(tidyverse) | |
| library(sf) | |
| library(mapedit) | |
| library(mapview) | |
| library(RColorBrewer) | |
| # Retrieve data --------------------- | |
| # MSOA names | |
| # Source: House of Commons Library | |
| # URL: https://houseofcommonslibrary.github.io/msoanames | |
| msoa_names <- read_csv("https://houseofcommonslibrary.github.io/msoanames/MSOA-Names-Latest2.csv") %>% | |
| select(msoa21cd, msoa21nm, msoa21hclnm, lad21nm = localauthorityname) | |
| # MSOA boundaries | |
| # Source: ONS Open Geography Portal | |
| # URL: https://geoportal.statistics.gov.uk/datasets/ons::middle-layer-super-output-areas-december-2021-boundaries-super-generalised-clipped-ew-bsc | |
| msoa <- st_read("https://services1.arcgis.com/ESMARspQHYMw9BZ9/arcgis/rest/services/MSOA_2021_EW_BSC/FeatureServer/0/query?outFields=*&where=1%3D1&f=geojson") %>% | |
| select(msoa21cd = MSOA21CD) %>% | |
| left_join(msoa_names, by = "msoa21cd") | |
| # Passports held: No passport held | |
| # Source: 2021 Census, ONS | |
| # URL: hhttps://www.nomisweb.co.uk/sources/census_2021_bulk | |
| url <- "https://www.nomisweb.co.uk/output/census/2021/census2021-ts005.zip" | |
| download.file(url, dest = "ensus2021-ts005.zip") | |
| unzip("ensus2021-ts005.zip") | |
| file.remove("ensus2021-ts005.zip") | |
| df <- read_csv("census2021-ts005-msoa.csv") %>% | |
| select(msoa21cd = `geography code`, | |
| total = `Passports held: Total; measures: Value`, | |
| n = `Passports held: No passport held; measures: Value`) %>% | |
| mutate(percent = round(n/total*100,1)) %>% | |
| select(msoa21cd, percent) | |
| # Join Census data to spatial layer --------------------- | |
| sf <- left_join(msoa, df, by = "msoa21cd") | |
| # Draw a polygon or a rectangle --------------------- | |
| box <- drawFeatures() | |
| # Filter by chosen area and plot --------------------- | |
| sf_use_s2(FALSE) # switch off s2 spherical geometry package | |
| selected <- st_filter(sf, box, .predicate = st_intersects) # or st_within | |
| # Create choropleth map --------------------- | |
| mapview(selected, zcol = "percent", | |
| col.regions = brewer.pal(5, "YlGnBu")) + | |
| mapview(box, lwd = 2, alpha.regions = 0) |
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