TravelTime Isochrone

This R script extracts isochrone maps from the TravelTime platform using the TravelTimeR package and displays them in a leaflet map.

What is the TravelTime API?

The TravelTime API is a service provided by TravelTime that allows developers to calculate travel time and distances. It supports various modes of transportation and provides functionalities such as isochrone mapping, route optimization, and time-specific travel calculations.

How the Code Works

1. Load Required Libraries: The script begins by loading the necessary R libraries - traveltimeR for interfacing with the TravelTime API and leaflet for creating interactive maps.

2. Set API Credentials: To access the TravelTime API, you need to set your API credentials using the Sys.setenv() function. You can sign up for an API key here.

3. Request Isochrones for Multiple Locations:

   • The script defines a list of arrival coordinates representing airports in Southeast England.
   • It then initializes an empty list to store the resulting maps.
   • Next, it loops through each arrival coordinate, creates a search object, and requests isochrones from the API using time_map_fast() function.
   • The resulting isochrone shapes are extracted and stored along with their colors in the maps list.

4. Create Leaflet Map:

   • After obtaining the isochrone data, the script creates a leaflet map.
   • It adds provider tiles for the map background and tiles for roads.
   • Then, it adds polygons representing each isochrone to the map.

5. Display the Map: Finally, the script displays the generated map.

Requirements

• R environment
• traveltimeR and leaflet R packages
• TravelTime API credentials (API ID and API key)

Example Output

Notes

• The script uses the TravelTime API to generate isochrone maps for specified arrival coordinates (in this case, airports). You may modify the coordinates and parameters as needed.
• Free API usage is limited to a maximum of 5 searches per minute, if you are using the "free - restricted" version you will receive an email to state you are at the maximum of your API usage with this code.