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Keith Jenkins

EXIF image metadata has the craziest way to store lat/lon coordinates that I've ever seen... a sequence of 3 (degrees, minutes, seconds) values stored as rational64u numeric types

Screenshot showing latitude stored as a sequence of 3 custom number types. 3 because of degrees, minutes, and seconds. Each component number is a "rational64u" value, with numerator and denominator values.
19 Sep 2023 at 4:01 | Open on mapstodon.space
8 comments
Keith Jenkins

I've never heard of "rational64u" data types before -- was this something invented just for EXIF?

19 Sep 2023 at 4:03 | Open on mapstodon.space
Luis Herrero

@kgjenkins ffmpeg also uses something similar for framerate, but it makes a lot of sense there.

Here... I do not know why. Maybe the people that did it hated IEEE 754? Just kidding. I bet they try to avoid precisión issues when converting to text, but this is only a random guess.

19 Sep 2023 at 7:05 | Open on mastodon.social
Raúl Nanclares 🍜

@kgjenkins
Uhg , wonder why someone would need that structure...

19 Sep 2023 at 4:24 | Open on fosstodon.org
Keith Jenkins

They should have just simplified the standard and just gone with decimal degrees!

19 Sep 2023 at 4:34 | Open on mapstodon.space
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