README.Rmd

---
output: github_document
bibliography: inst/REFERENCES.bib
link-citations: yes
---

<!-- README.md is generated from README.Rmd. Please edit that file -->

```{r, include = FALSE}
knitr::opts_knit$set(
  progress = TRUE,
  base.url = "https://raw.githubusercontent.com/ropengov/giscoR/main/"
)

knitr::opts_chunk$set(
  collapse = TRUE,
  tidy = "styler",
  comment = "#>",
  fig.path = "img/README-",
  warning = FALSE,
  message = FALSE,
  dev = "ragg_png",
  dpi = 300,
  out.width = "100%"
)
```

# giscoR <a href='https://ropengov.github.io/giscoR/'><img src="man/figures/logo.png" align="right" height="139"/></a>

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[**giscoR**](https://ropengov.github.io/giscoR//) is an API package that helps
to retrieve data from [Eurostat - GISCO (the Geographic Information System of
the COmmission)](https://ec.europa.eu/eurostat/web/gisco). It also provides some
lightweight data sets ready to use without downloading.

[GISCO](https://ec.europa.eu/eurostat/web/gisco) is a geospatial open data
repository including several data sets as countries, coastal lines, labels or
[NUTS levels](https://ec.europa.eu/eurostat/web/regions-and-cities/overview).
The data sets are usually provided at several resolution levels
(60M/20M/10M/03M/01M) and in 3 different projections (4326/3035/3857).

Note that the package does not provide metadata on the downloaded files, the
information is available on the [API
webpage](https://gisco-services.ec.europa.eu/distribution/v2/).

Full site with examples and vignettes on <https://ropengov.github.io/giscoR/>

## Installation

Install **giscoR** from [**CRAN**](https://CRAN.R-project.org/package=giscoR):

```{r, eval=FALSE}
install.packages("giscoR")
```

You can install the developing version of **giscoR** with:

```{r, eval=FALSE}
remotes::install_github("rOpenGov/giscoR")
```

Alternatively, you can install **giscoR** using the
[r-universe](https://ropengov.r-universe.dev/giscoR):

```{r, eval=FALSE}
install.packages("giscoR",
  repos = c("https://ropengov.r-universe.dev", "https://cloud.r-project.org")
)
```

## Usage

This script highlights some features of **giscoR** :

```{r example}
library(giscoR)
library(sf)
library(dplyr)

# Different resolutions
DNK_res60 <- gisco_get_countries(resolution = "60", country = "DNK") %>%
  mutate(res = "60M")
DNK_res20 <-
  gisco_get_countries(resolution = "20", country = "DNK") %>%
  mutate(res = "20M")
DNK_res10 <-
  gisco_get_countries(resolution = "10", country = "DNK") %>%
  mutate(res = "10M")
DNK_res03 <-
  gisco_get_countries(resolution = "03", country = "DNK") %>%
  mutate(res = "03M")


DNK_all <- bind_rows(DNK_res60, DNK_res20, DNK_res10, DNK_res03)

# Plot ggplot2

library(ggplot2)

ggplot(DNK_all) +
  geom_sf(fill = "#c8102e") +
  facet_wrap(vars(res)) +
  theme_minimal()


# Labels and Lines available

labs <- gisco_get_countries(
  spatialtype = "LB",
  region = "Africa",
  epsg = "3857"
)

coast <- gisco_get_countries(
  spatialtype = "COASTL",
  epsg = "3857"
)

# For zooming
afr_bbox <- st_bbox(labs)

ggplot(coast) +
  geom_sf(col = "deepskyblue4", linewidth = 3) +
  geom_sf(data = labs, fill = "springgreen4", col = "darkgoldenrod1", size = 5, shape = 21) +
  coord_sf(
    xlim = afr_bbox[c("xmin", "xmax")],
    ylim = afr_bbox[c("ymin", "ymax")]
  )
```

### Labels

An example of a labeled map using **ggplot2**:

```{r labels, fig.height=7, fig.width=6}
ITA <- gisco_get_nuts(country = "Italy", nuts_level = 1)

ggplot(ITA) +
  geom_sf() +
  geom_sf_text(aes(label = NAME_LATN)) +
  theme(axis.title = element_blank())
```

### Thematic maps

An example of a thematic map plotted with the **ggplot2** package. The
information is extracted via the **eurostat** package [@RJ-2017-019]. We would
follow the fantastic approach presented by [Milos
Popovic](https://milospopovic.net/) on [this
post](https://milospopovic.net/how-to-make-choropleth-map-in-r/):

We start by extracting the corresponding geographic data:

```{r euroex, fig.asp=1.1}
# Get shapes
nuts3 <- gisco_get_nuts(
  year = "2021",
  epsg = "3035",
  resolution = "10",
  nuts_level = "3"
)

# Group by NUTS by country and convert to lines
country_lines <- nuts3 %>%
  group_by(
    CNTR_CODE
  ) %>%
  summarise(n = n()) %>%
  st_cast("MULTILINESTRING")
```

We now download the data from Eurostat:

```{r}
# Use eurostat
library(eurostat)
popdens <- get_eurostat("demo_r_d3dens") %>%
  filter(TIME_PERIOD == "2021-01-01")
```

By last, we merge and manipulate the data for creating the final plot:

```{r thematic, fig.asp=1.1}
# Merge data
nuts3_sf <- nuts3 %>%
  left_join(popdens, by = "geo")

nuts3_sf <- nuts3 %>%
  left_join(popdens, by = c("NUTS_ID" = "geo"))


# Breaks and labels

br <- c(0, 25, 50, 100, 200, 500, 1000, 2500, 5000, 10000, 30000)
labs <- prettyNum(br[-1], big.mark = ",")

# Label function to be used in the plot, mainly for NAs
labeller_plot <- function(x) {
  ifelse(is.na(x), "No Data", x)
}
nuts3_sf <- nuts3_sf %>%
  # Cut with labels
  mutate(values_cut = cut(values, br, labels = labs))


# Palette
pal <- hcl.colors(length(labs), "Lajolla")


# Plot
ggplot(nuts3_sf) +
  geom_sf(aes(fill = values_cut), linewidth = 0, color = NA, alpha = 0.9) +
  geom_sf(data = country_lines, col = "black", linewidth = 0.1) +
  # Center in Europe: EPSG 3035
  coord_sf(
    xlim = c(2377294, 7453440),
    ylim = c(1313597, 5628510)
  ) +
  # Legends
  scale_fill_manual(
    values = pal,
    # Label for NA
    labels = labeller_plot,
    drop = FALSE, guide = guide_legend(direction = "horizontal", nrow = 1)
  ) +
  # Theming
  theme_void() +
  # Theme
  theme(
    plot.title = element_text(
      color = rev(pal)[2], size = rel(1.5),
      hjust = 0.5, vjust = -6
    ),
    plot.subtitle = element_text(
      color = rev(pal)[2], size = rel(1.25),
      hjust = 0.5, vjust = -10, face = "bold"
    ),
    plot.caption = element_text(color = "grey60", hjust = 0.5, vjust = 0),
    legend.text = element_text(color = "grey20", hjust = .5),
    legend.title = element_text(color = "grey20", hjust = .5),
    legend.position = "bottom",
    legend.title.position = "top",
    legend.text.position = "bottom",
    legend.key.height = unit(.5, "line"),
    legend.key.width = unit(2.5, "line")
  ) +
  # Annotate and labs
  labs(
    title = "Population density in 2021",
    subtitle = "NUTS-3 level",
    fill = "people per sq. kilometer",
    caption = paste0(
      "Source: Eurostat, ", gisco_attributions(),
      "\nBased on Milos Popovic: ",
      "https://milospopovic.net/how-to-make-choropleth-map-in-r/"
    )
  )
```

## A note on caching

Some data sets (as Local Administrative Units - LAU, or high-resolution files)
may have a size larger than 50MB. You can use **giscoR** to create your own
local repository at a given local directory passing the following function:

```{r, eval=FALSE}
gisco_set_cache_dir("./path/to/location")
```

You can also download manually the files (`.geojson` format) and store them on
your local directory.

## Recommended packages

### API data packages

-   **eurostat** [@RJ-2017-019]: This is an API package that provides access to
    open data from Eurostat.

### Plotting **sf** objects

Some packages recommended for visualization are:

-   [**tmap**](https://r-tmap.github.io/tmap/)
-   [**ggplot2**](https://github.com/tidyverse/ggplot2) +
    [**ggspatial**](https://github.com/paleolimbot/ggspatial) +
    [**tidyterra**](https://dieghernan.github.io/tidyterra/)
-   [**mapsf**](https://riatelab.github.io/mapsf/)
-   [**leaflet**](https://rstudio.github.io/leaflet/)

## Contribute

Check the GitHub page for [source code](https://github.com/rOpenGov/giscoR/).

Contributions are very welcome:

-   [Use issue tracker](https://github.com/rOpenGov/giscoR/issues) for feedback
    and bug reports.
-   [Send pull requests](https://github.com/rOpenGov/giscoR/)
-   [Star us on the GitHub page](https://github.com/rOpenGov/giscoR)

## Citation

```{r echo=FALSE, results='asis'}
print(citation("giscoR"), bibtex = FALSE)
```

A BibTeX entry for LaTeX users is

```{r echo=FALSE, comment=""}
toBibtex(citation("giscoR"))
```

## Copyright notice

> When data downloaded from this page is used in any printed or electronic
> publication, in addition to any other provisions applicable to the whole
> Eurostat website, data source will have to be acknowledged in the legend of
> the map and in the introductory page of the publication with the following
> copyright notice:
>
> -   EN: © EuroGeographics for the administrative boundaries.
> -   FR: © EuroGeographics pour les limites administratives.
> -   DE: © EuroGeographics bezüglich der Verwaltungsgrenzen.
>
> For publications in languages other than English, French or German, the
> translation of the copyright notice in the language of the publication shall
> be used.
>
> If you intend to use the data commercially, please contact
> [EuroGeographics](https://eurogeographics.org/maps-for-europe/licensing/) for
> information regarding their licence agreements.
>
> *From [GISCO
> Web](https://ec.europa.eu/eurostat/web/gisco/geodata/statistical-units)*

## Disclaimer

This package is in no way officially related to or endorsed by Eurostat.

## References