congruent: Datasets to illustrate the concept of spatial congruence

In spData: Datasets for Spatial Analysis

Datasets to illustrate the concept of spatial congruence

Description

Sample of old (incongruent) and new (congruent) administrative zones from UK statistical agencies

Usage

congruent

Format

Simple feature geographic data in a projected CRS (OSGB) with random values assigned for teaching purposes.

Source

https://en.wikipedia.org/wiki/ONS_coding_system

Examples

if(requireNamespace("sf", quietly = TRUE)) {
  library(sf)
  plot(aggregating_zones$geometry, lwd = 5)
  plot(congruent$geometry, add = TRUE, border = "green", lwd = 2)
  plot(incongruent$geometry, add = TRUE, border = "blue", col = NA)
  rbind(congruent, incongruent)
}
# Code used to download the data:
## Not run: 
#devtools::install_github("robinlovelace/ukboundaries")
library(sf)
library(tmap)
library(dplyr)
#library(ukboundaries)
sel = grepl("003|004", msoa2011_lds$geo_label)
aggregating_zones = st_transform(msoa2011_lds[sel, ], 27700)
# find lsoas in the aggregating_zones
lsoa_touching = st_transform(lsoa2011_lds, 27700)[aggregating_zones, ]
lsoa_cents = st_centroid(lsoa_touching)
lsoa_cents = lsoa_cents[aggregating_zones, ]
sel = lsoa_touching$geo_code %in% lsoa_cents$geo_code
# same for ed zones
ed_touching = st_transform(ed1981, 27700)[aggregating_zones, ]
ed_cents = st_centroid(ed_touching)
ed_cents = ed_cents[aggregating_zones, ]
incongruent_agg_ed = ed_touching[ed_cents, ]
set.seed(2017)
incongruent_agg_ed$value = rnorm(nrow(incongruent_agg_ed), mean = 5)
congruent = aggregate(incongruent_agg_ed["value"], lsoa_touching[sel, ], mean)
congruent$level = "Congruent"
congruent = congruent[c("level", "value")]
incongruent_cents = st_centroid(incongruent_agg_ed)
aggregating_value = st_join(incongruent_cents, congruent)$value.y
incongruent_agg = aggregate(incongruent_agg_ed["value"], list(aggregating_value), FUN = mean)
incongruent_agg$level = "Incongruent"
incongruent = incongruent_agg[c("level", "value")]
summary(st_geometry_type(congruent))
summary(st_geometry_type(incongruent))
incongruent = st_cast(incongruent, "MULTIPOLYGON")
summary(st_geometry_type(incongruent))
summary(st_geometry_type(aggregating_zones))
devtools::use_data(congruent, overwrite = TRUE)
devtools::use_data(incongruent, overwrite = TRUE)
devtools::use_data(aggregating_zones, overwrite = TRUE)

## End(Not run)

spData documentation built on Sept. 11, 2024, 5:36 p.m.