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For our project, we are exploring Terrain and Satellite maps using Leaflet.js

While exploring the Internet got this OpenTopoMap. However, not sure whether this is a Terrain Map.

For Satellite got this Esri.WorldImagery. However, as the map source is https://server.arcgisonline.com don't know whether these are open source maps or paid maps.

Also, is there any open source basemap like OSM for Terrain and Satellite maps?

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According to this article Esri World Imagery can be used free of cost when all of the following conditions are met:

  1. You have signed up for a free ArcGIS Developer account
  2. You are not generating revenue from your app (in the form of advertisements or subscriptions)
  3. Your users request < 1 million tiles/month
  4. You properly attribute both Esri and all of our data providers

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