Data[edit]

free terrain data for anywhere in the world

aw:Aster instrument of the Terra satellite is also freely available for 99% of the globe, and represents elevation at 30 meter resolution... When land topography and bathymetry is combined, a truly Global Relief Model is obtained... ALOS provides since 2016 a global 1-arc second DSM free of charge... OpenTopography is a community access resource of high-resolution

http://www.opendem.info

aw:Category:Elevation api[edit]

Category:Водные пути[edit]

реки в русской википедии имеют данные про водоток (исток, устье); расположение (притоки, населенные пункты)

• Wikidata has 'river mouth', 'river source' coordinates
• mw:Extension:Maps gives middle coordinates by geocoding
• World Rivers visualization on basis of aw:Natural Earth
  • lakes with rivers good
• Sources... Rivers : Demis
• we first download the simplified shapefile of rivers polygons from the OpenStreetMapData page - poor data but good idea