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ventanayesterday at 8:44 AM5 repliesview on HN

The paper is basically like this (spoiler alert):

“Some random user on Reddit posted a picture claiming that this is the longest straight line path on water possible on the Earth. We implemented a smart algorithm to solve this problem, found the elevation data, ran our algorithm... yes, that random user was right. Also, here's the longest path on land.”

Thanks, I really enjoyed reading it, even though I hoped that they would disprove the original claim!

Edit: here are the gcmap links to the two paths: sea [1], land [2].

[1]: http://www.gcmap.com/mapui?P=25%B017%27N+66%B040%27E-58%B037...

[2]: http://www.gcmap.com/mapui?P=24%B033%27N+118%B038%27E-37%B02...


Replies

cubefoxyesterday at 11:13 AM

They only identify the Reddit user as "kepleronlyknows", but in the Reddit thread [1] he links to his video visualization [2], where his user name is Patrick Anderson.

Before he made the video visualization using Google Earth, he actually went to the library and used a string on a real globe. [3]

1: https://www.reddit.com/r/MapPorn/comments/15mwai/the_longest...

2: http://www.youtube.com/watch?v=VpQwuGueeoA

3: https://imgur.com/a/great-circle-2hYFM

alok-gyesterday at 4:28 PM

Adding: The two paths respectively are about 80% and 28% of the earth's circumference.

kromokromoyesterday at 4:29 PM

Kudos to whoever built tiled clouds background on the gcmap site.

paganeltoday at 4:21 AM

The Portugal to (approximately) Macao one is quite interesting, thanks for the links!

comrade1234yesterday at 10:12 AM

I opened Apple Maps in globe mode and I still have trouble visualizing the water path.

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