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Articles about distances, maps and how they are measured
Plain-language articles about distances, maps and the data behind them, with interactive maps and calculators you can use or embed on your own site.
Latest article
Price per m² in Greater Buenos Aires: map by neighbourhood and district
Every neighbourhood of the city and every district of the suburbs, coloured by what a square metre costs, to buy or to rent.
2 min read
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2 min read
Calculate how much you are owed for a delayed or cancelled flight under EU 261
How much compensation a delayed, cancelled or overbooked flight is worth under EU 261: €250, €400 or €600 by distance, when the airline can refuse, and a calculator.
Read the article4 min read
Flight time calculator: how long a flight takes, from the distance
How the flight time is estimated from the distance: cruising speed plus take-off and landing, with a map you can drag and real routes worked out.
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3 min read
Why do planes seem to fly in a curve?
Why a flight route looks curved on a map, what the haversine formula does about it, and a map you can drag to watch the distance change. No equations.
Read the article5 min read
Haversine calculator: formula step by step, with a map
An interactive haversine calculator that recomputes every step of the formula as you drag two points, plus the New York–London worked example.
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