Monday, November 21, 2022

The Global Watershed Map

Click anywhere on the Global Watersheds map and you can view a visualization of the upstream watersheds calculated from your selected location. The map allows you to quickly see where water is coming from and where it is going at any location on Earth.

The screenshot above shows the huge 1 million km² watershed flowing from the Andes into the Solimões River in Brazil. If you want to view the world's largest watersheds on the Global Wathershed map then click downstream in the Amazon Basin (the world's largest watershed) or downstream in the Mississippi River Watershed in the United States.

If you wish to see where a watercourse flows to then you can select the 'downstream' option on the map. This will then display the flow path of the selected river from the selected location to the ocean. Other options allow you to download the data of a watershed in geoJSON, shapefile or KML formats.

You can view an animated journey of the downstream flow path of a river on the River Runner interactive map. River Runner Global allows you to virtually drop a raindrop anywhere in the world to visualize its journey to the sea. You can select any location in the world on the map and then watch the animated journey that a raindrop would take from that location downstream to the sea. 

In order to work worldwide River Runner Global uses the MERIT-Basins global vector hydrography dataset. The map also uses Natural Earth data for the river name labels. You can read more about River Runner Global here.This 'about' page includes information on how to download the river name data and how to clone and deploy the River Runner API.

Global Watersheds also has an API. You can read more about the Global Watersheds API on the map's about page. The API allows you to grab the geoJSON data for any location in the world by entering a lat/lng as a query string to a formated URL.

The River Runner Global team has also compiled a list of some of their favorite raindrop paths. River Runner Global Paths includes links to over 20 animated journeys, showing how a drop of water would travel from locations around the world - downstream to the sea.

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