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Isolines

library(ggplot2)
library(VancouvR)

The City of Vancouver Open Data Portal includes an elevation contour dataset with 1-metre contour lines covering the city. Because the dataset has a geo_shape field, get_cov_data() automatically returns it as an sf object, so it can be passed directly to geom_sf() without any additional conversion.

contours <- get_cov_data("elevation-contour-lines-1-metre-contours")
#> Downloading data from CoV Open Data portal
class(contours)  # "sf" "data.frame"
#> [1] "sf"         "tbl_df"     "tbl"        "data.frame"

Mapping the contour lines coloured by elevation takes only a few lines:

ggplot(contours) +
  geom_sf(aes(color=elevation), size=0.1) +
  scale_color_viridis_c(option="inferno", guide="none") +
  theme_void()

The same pattern works for any spatial dataset on the portal. Use get_cov_metadata() to check whether a dataset has a geo_shape field before downloading:

get_cov_metadata("elevation-contour-lines-1-metre-contours") |>
  dplyr::filter(type == "geo_shape")
#> # A tibble: 1 × 4
#>   name  type      label description           
#>   <chr> <chr>     <chr> <chr>                 
#> 1 geom  geo_shape Geom  Spatial representation

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