Load and Wrangle IDMC Displacement Data.

idmc

The goal of idmc is to provide easy access and wrangling of displacement data stored in the Internal Displacement Monitoring Centre’s (IDMC) displacement database. The data is retrieved from the Internal Displacement Update API.

Installation

You can install idmc from CRAN:

install.packages("idmc")

Alternatively, you can install the development version of idmc from GitHub with:

# install.packages("devtools")
devtools::install_github("OCHA-DAP/idmc")

API URL

You need an IDMC endpoint URL to access the API. These are provided by IDMC. The easiest way to save the URL for use in your R sessions is by using usethis::edit_r_environ() and adding the variable there as:

IDMC_API="Insert API URL here"

Usage

library(idmc)

The simple use for the idmc package is to retrieve the data from the API directly into R.

df <- idmc_get_data()
df
#> # A tibble: 20,289 × 26
#>        id country  iso3  latitude longitude centroid displacement_type qualifier
#>     <int> <chr>    <chr>    <dbl>     <dbl> <chr>    <chr>             <chr>    
#>  1 120233 United … USA      31.1     -93.2  [31.114… Disaster          total    
#>  2 120186 United … USA      39.1     -94.5  [39.092… Disaster          total    
#>  3 120191 United … USA      44.9    -123.   [44.912… Disaster          total    
#>  4 120197 Dominic… DOM      19.3     -70.0  [19.281… Disaster          total    
#>  5 120195 Dominic… DOM      19.3     -70.0  [19.281… Disaster          total    
#>  6 120110 France   FRA      44.5       6.47 [44.498… Disaster          more than
#>  7 120124 Indones… IDN      -7.46    109.   [-7.458… Disaster          total    
#>  8 120188 United … USA      30.7     -93.5  [30.706… Disaster          total    
#>  9 120208 Viet Nam VNM      22.8     105.   [22.779… Disaster          total    
#> 10 120047 Philipp… PHL       6.85    124.   [6.8514… Disaster          total    
#> # ℹ 20,279 more rows
#> # ℹ 18 more variables: figure <int>, displacement_date <date>,
#> #   displacement_start_date <date>, displacement_end_date <date>, year <int>,
#> #   event_name <chr>, event_start_date <date>, event_end_date <date>,
#> #   category <chr>, subcategory <chr>, type <chr>, subtype <chr>,
#> #   standard_popup_text <chr>, event_url <chr>, event_info <chr>,
#> #   standard_info_text <chr>, old_id <chr>, created_at <date>

This data frame, with variables described in the API documentation, includes 1 row per event. We can normalize this to daily displacement, assuming uniform distribution of displacement between start and end date, for all countries and type of displacement. idmc_transform_daily().

idmc_transform_daily(df)
#> # A tibble: 71,750 × 5
#>    iso3  country    displacement_type date       displacement_daily
#>    <chr> <chr>      <chr>             <date>                  <dbl>
#>  1 AB9   Abyei Area Conflict          2020-01-20               600 
#>  2 AB9   Abyei Area Conflict          2020-01-21               600 
#>  3 AB9   Abyei Area Conflict          2020-01-22               600 
#>  4 AB9   Abyei Area Conflict          2020-01-23               600 
#>  5 AB9   Abyei Area Conflict          2020-01-24               600 
#>  6 AB9   Abyei Area Conflict          2020-01-25               600 
#>  7 AB9   Abyei Area Conflict          2020-01-26               600 
#>  8 AB9   Abyei Area Conflict          2020-01-27               600 
#>  9 AB9   Abyei Area Conflict          2020-04-13               260 
#> 10 AB9   Abyei Area Conflict          2022-02-10              9937.
#> # ℹ 71,740 more rows

While there are a few other parameters you can play around with in these functions, this is the primary purpose of this simple package.