geodata
- https://geojson.org
- https://geojson.io: Online GeoJSON editor
- https://tools.ietf.org/html/rfc7946
- https://www.gpsbabel.org
- https://en.wikipedia.org/wiki/Military_Grid_Reference_System
- https://en.wikipedia.org/wiki/Open_Location_Code
- https://en.wikipedia.org/wiki/World_Geodetic_System
- https://what3words.com
- https://www.geocaching.com
- https://macwright.com/lonlat: "Geospatial software has a fundamental inconsistency: which order we put longitude and latitude in."
- https://platform.leolabs.space/visualization: Live visualization of low earth orbit traffic, including satellites, rockets and debris.
- https://satellitemap.space: Live visualization of a few different types of satellites like Starlink, GPS, Oneweb
- https://en.wikipedia.org/wiki/Dilution_of_precision_(navigation)
- https://healpix.jpl.nasa.gov: "Hierarchical Equal Area isoLatitude Pixelization of a sphere"
- https://hivekit.io/blog/the-headaches-of-distributed-spatial-indices: "Hexagons and Hilbert Curves - The Headaches of Distributed Spatial Indices"
- https://app.regrid.com/us: Property lines
- https://shademap.app: Visualize shadows from trees and landscape for any given time and place
- https://www.qgis.org: "Spatial visualization and decision-making tools for everyone", FOSS.
- https://joe-antognini.github.io/astronomy/daylight: "How Fast the Days Are Getting Longer"
- https://en.wikipedia.org/wiki/Sunrise_equation: "The sunrise equation or sunset equation can be used to derive the time of sunrise or sunset for any solar declination and latitude in terms of local solar time when sunrise and sunset actually occur."
Hexagonal geodata
- https://www.redblobgames.com/grids/hexagons/: Lots of interactive learning fun with hexagons. Really great resource for playing with hexagon theory.
- https://www.uber.com/blog/h3/: Uber’s Hexagonal Hierarchical Spatial Index
- https://pro.arcgis.com/en/pro-app/latest/tool-reference/spatial-statistics/h-whyhexagons.htm: short explanation of the benefits of a hexagonal geo datum
- https://www.gamedev.net/articles/programming/general-and-gameplay-programming/coordinates-in-hexagon-based-tile-maps-r1800/: interesting theory for addressing hexagonal space in games
- https://james.darpinian.com/satellites: "See a satellite tonight. No telescope required"
- https://www.boristhebrave.com/2021/05/23/triangle-grids: This is actually about triangles, but touches on hexagons a bit, including some negative aspects.