Nocturnal/diurnal filter?

[tphakala]

How feasible it would be to add time of day filter? I guess large number of species are either diurnal or nocturnal so time of day could be used to filter our false positives. Is such data available at eBird or in any other database?

[kahst]

Good question! We've tried this before, but never really followed through. Theoretically, we could try to use the recording times from Xeno-canto to estimate the call times of each bird species. Assuming that the recording times are local time, you could get a pretty accurate picture (with some biases of course, but eBird has those too).

Here is what this would look like for a few selected species (normalized calling probability):

It looks like we can correctly derive the diurnal calling patterns for each species. So we could add another filter to sort out owl detections during the day. Maybe a feature request for the near future :)

In the meantime, if you want to play around with the numbers, you can find the raw data for all species below. Based on the number of recordings per hour, we normalized the call probability between 0 and 100. If there wasn't enough data for a species (the XC metadata is a mess), we used 100 for each hour:

Download species_recording_times.json here

[kahst]

Cool! So, do you think the metadata model would benefit from a diurnal filter? Or should it be a separate filter?

[Mattk70]

It’s a separate filter, I think. You could allow ppl to combine them? i.e location filter and, let’s call it ‘behaviour filter’, so you wouldn’t get nocturnal/diurnal birds reported that wouldn’t be in your location. If you build this kind of filter into the metadata model you wouldn't be able to use it with a custom list. That's if I've understood you correctly?

[Mattk70]

I've published a pre-release with this filter enabled here: https://github.com/Mattk70/Chirpity-Electron/releases/tag/v1.1.0. If you haven't installed Chirpity before, do refer to the website to understand how to navigate the installation process. Also make sure to go to the Settings menu, select Birdnet from the model dropdown, and 'Nocturnal birds" as the list.
Let me know if this new filter is effective or how it might be improved? It's always good to have somehting to kick about to get a better handle on these things!

[Mattk70]

Really sorry folks, but I have pulled that pre-release. I can't figure out why, but the build came from the main branch of my repo, not the one in which I'd made the changes. I also can't figure out how to publish from that branch at all.

[Mattk70]

I have released v1.1.0 of Chirpity, which contains this filter, along with the ability to combine the filter with the 'Local Birds' filter that uses lat/lon and optionally week to refine results.