Built on open data
Every map reads public data, and every number on it says where it came from and when. Here is each source, with the maps that read it.
Open sources
50
each one named on the maps that use it
Atlases reading them
11and the Gazette
every one also reads the 4 sources for India's places and outline
One register of places
LGD
India's Local Government Directory: a district reads the same on every map. Places has a page for each.
Sources each atlas reads
Its own sources; the 4 every map reads are not counted again.
By kind
Weather and climate
8 sources
Hourly observations (Iowa Environmental Mesonet, via Source Cooperative), the nightly score
Satellites
5 sources
Places and boundaries
5 sources
Health and pests
4 sources
Land and coast
27 sources
Every light on India's coasts: position, lamp height, listed range, rhythm, tower
Each lighthouse's own page: history, amenities, booking, hours
The lighthouses developed for visitors, named in a reply to the Rajya Sabha (PIB, 11 Aug 2026)
Every vessel heard broadcasting its position in India's waters, hour by hour, and its flag and type; ships meeting at sea; broadcasts gone silent (non-commercial licence)
Mangrove planted in place of mangrove cleared: site boundaries, planting years, reported survival
Design and relief
1 source
Home page background: the Western Ghats behind Goa, 60 m contours from the Copernicus 90 m elevation model.