Galin progress
Index

The WorkshopNo. 06

Year Status: On the bench

GeoGuesser

Give it a video with sound, and in time it finds where on Earth it was filmed, from the Doppler shift of aircraft in the low frequencies of the audio.

Fields

ΔΟΣ ΜΟΙ ΠΑ ΣΤΩ ΚΑΙ ΤΑΝ ΓΑΝ ΚΙΝΑΣΩ

“Give me a place to stand, and I will move the earth.”Archimedes, as told by Pappus
Render · in preparation
Fig. β · Render
Fig. α · Sketch

Schematic

How it works

Fig. γ · Tav. VI · How it works

How GeoGuesser works, step by step:

  • A video with sound (input) to Low frequencies: audio
  • Low frequencies to Aircraft Doppler: passing aircraft
  • Aircraft Doppler to Where on Earth (output)

Note on Aircraft Doppler: Given enough time

The idea

An aircraft passing a camera leaves a trace in the sound: its pitch falls as it goes by, the Doppler effect. GeoGuesser listens for it in the low frequencies of the audio, and with enough time it works out where on Earth the video was filmed.