In reference to that "Finding the Air Cannon" article. The author indicated the following facts:
* His listening posts were part of a triangle with sides of length 3.8km, 3.0km and 6.3km
* The vertices were on the roads in Corvallis, Bellfountain Rd, Brooklane Dr and Rivergreen Ave
* The relative times of arrival are 0, 4, 6
* The temperature was 35F or 1 degree celsius
The only way I can make a triangle that fits on those three roads yields a set of the following likely co-ordinates from where his listening posts are:
Adding the relative times to the co-ordinates in a form whereby my localization program can work on it and putting it through my localization program I get the following result:
$ localize_event.sh 1
44.52421,-123.33492 2024-05-27_12-00-00.0
44.53796,-123.29172 2024-05-27_12-00-04.0
44.52975,-123.25571 2024-05-27_12-00-06.0
Enter GPS coordinates and timestamps. Press enter twice to finish.
Location: 44.488866130770134,-123.31219694386117
* His listening posts were part of a triangle with sides of length 3.8km, 3.0km and 6.3km
* The vertices were on the roads in Corvallis, Bellfountain Rd, Brooklane Dr and Rivergreen Ave
* The relative times of arrival are 0, 4, 6
* The temperature was 35F or 1 degree celsius
The only way I can make a triangle that fits on those three roads yields a set of the following likely co-ordinates from where his listening posts are:
44.52421,-123.33492 44.53796,-123.29172 44.52975,-123.25571
Adding the relative times to the co-ordinates in a form whereby my localization program can work on it and putting it through my localization program I get the following result:
$ localize_event.sh 1
44.52421,-123.33492 2024-05-27_12-00-00.0
44.53796,-123.29172 2024-05-27_12-00-04.0
44.52975,-123.25571 2024-05-27_12-00-06.0
Enter GPS coordinates and timestamps. Press enter twice to finish. Location: 44.488866130770134,-123.31219694386117
Web links:
OpenStreetMap:
https://www.openstreetmap.org/?mlat=44.488866130770134&mlon=...
Google Maps:
https://www.google.com/maps?q=44.488866130770134,-123.312196...
Which results in a location south and west of the airport as described in the article :)
Knowing how localization works where the sound source is outside of the polygons it could be a bit further South as well.
I'd be very curious to know how close I have been in working this out.