Does "land area" assume a country is perfectly flat?

You can listen to the A Problem Squared podcast here (and everywhere else). Please do! https://aproblemsquared.libsyn.com/ Huge thanks to Dr Laura Graham! Everything they did is on github: https://github.com/laurajanegraham/su... All about Laura: https://laurajanegraham.github.io/ Prof Alasdair Rae was also big help and sent me their slides. http://bit.ly/measurelandarea This is that video:    • NH90SE 5m DTM from Ordnance Survey   All about Alasdair: http://www.statsmapsnpix.com/ Thanks to Phil Chapman for sending in the question and taking the time to record themselves reading it for me. Geoscience Australia were super helpful and answered all of my ridiculous questions. https://www.ga.gov.au/scientific-topi... Check out Steve Mould's Numberphile video on fractal coast lines.    • Measuring Coastline - Numberphile   Thanks to Bec Hill: comedian; podcast host; and the new voice of Geoscience Australia.    / @bechillcomedian   http://www.bechillcomedian.com/ CORRECTIONS At 14:02 I accidentally say a 9 instead of a 7 (the area is 247719 not 249719). The on-screen numbers are correct. Phew. Let me know if you spot any other mistakes. Thanks to my Patreons who mean I can spend tens of days of my life on a silly video like this. Here is a random subset of those fine Patreon People: Cubey Andy B Nicholas Koceja Jordan Scales Malcolm Rowe Sean Derek Chandler Paul LeVan Kristian Joensen Patrick Stover   / standupmaths   As always: thanks to Jane Street who support my channel. They're amazing. https://www.janestreet.com/ Filming and editing by Matt Parker Additional filming by Lucie Green A bunch of footage is from Pond5 Audio and music by Howard Carter Design by Simon Wright and Adam Robinson MATT PARKER: Stand-up Mathematician Website: http://standupmaths.com/ US book: https://www.penguinrandomhouse.com/bo... UK book: https://mathsgear.co.uk/collections/b...