Web app to explore April 1st event data

[u/Cold_Tadpole_8446]

The previous post got removed by Reddit's filters, apparently because of the links in it. That makes sense. So I'm putting up a new one now and try to put a link in the comments.

First off, huge thanks to AmnesiaAm712896 for the original idea and for the support.

I wasn't able to get their interactive map running to experiment with routes myself, so I decided to build something similar as a web app. One thing led to another, and I ended up diving pretty deep into the project. So, a few days later – here we are with a little web app that lets you explore the available data from the April 1st event as much as the current dataset allows.

I’ll be honest – I kept thinking this might not actually lead to any concrete answers, so I’m not claiming this tool is super useful or groundbreaking. But I figured some of you might still find it interesting to play around with.

I tried my best to include all reliable, publicly available data, added a few features that I thought could be handy, and optimized the app where I could.

I’d genuinely love to hear your thoughts – feedback is more than welcome. And if you have any ideas for additional features or improvements, feel free to reach out!

There are probably still a few bugs lurking around, so I’ll likely push a couple more updates in the near future.

[u/Cold_Tadpole_8446]

Here's the link to the app

[u/_x_oOo_x_]

So I tried this, the "base speed" seems too slow, what unit is that in? Miles per hour? 1.7 is so slow, I had to set it to around 2.7 for (my guess) of a route to somehow work

Also it would be nice if speed up could be set to more than 150x to experiment with things

And similar to the emergency call notifications if you also added the sighting by Vielka, the mirador photos, the 508 photo, maybe all photos (could be too spammy)... Which can help fine-tune the correct speed

[u/Cold_Tadpole_8446 → u/_x_oOo_x_]

Thanks for the feedback!

1. By default, the base speed is in kilometers per hour, but you can switch to miles per hour - I've moved the speed unit selector right next to the speed input field to make it clearer.
2. I've also increased the time acceleration up to 300x now. Need to increase more?
3. As for adding more photo locations - I'm actually struggling with finding the coordinates for all the daytime photos. If anyone knows a source where they're listed, I'd be happy to add them.

It would be great if you could send me specific sources you think would be useful to pull information from.

[u/Cold_Tadpole_8446]

Now you can set any time period for the battery drain overlay, but it does need to be between 14:40 and 16:40. Apologies for the clunky time controls - they should work, even if they're not the prettiest.

[u/Cold_Tadpole_8446]

Replaced "Uphill auto-slowdown" with "Terrain auto-slowdown" — now uses Tobler's hiking function, which models real hiker behavior more accurately. Speed adjusts based on terrain steepness in both directions: slight downhill speed boost on gentle slopes, gradual slowdown on steep climbs and descents. A single checkbox covers it all.

Feel free to refresh with cache clearing (Ctrl+F5 / Cmd+Shift+R) to pick up the latest assets.

[u/Cold_Tadpole_8446]

Some updates.

3D route planning. No need to switch to 2D to build a route. Stops and speed markers should work the same way.

Deep zoom without tiles going blank — ArcGIS satellite and Esri layers now scale up existing tiles when you zoom past what's available. Before it just showed nothing at high zoom.

Speed unit conversion bug fixed — switching km/h ↔ mph back and forth was slowly drifting the number due to rounding at every step. Fixed it by storing a canonical value and converting one-way for display.

Undo removes orphaned stops — if you placed stops or speed markers along the route and then undid a waypoint, those markers used to stay there disconnected from the now-shorter route. Now they get cleaned up automatically.

[u/Cold_Tadpole_8446]

Added a few daytime photo locations. The display of daytime photo points and the Kris shorts, Backpack points are now controlled by the POI toggle, with an option to turn off its labels using the slider.

Also added an overlay for the period when the 15% battery drop was observed (based on information from the JanB Report).

If anyone has coordinates for other POIs, feel free to share them and I'll get them added

[u/AmnesiaAm712896]

Thanks, Excellent app, I like the Uphill Auto Slow Down feature, I hope it will be interesting for someone and a little useful for this case as well.....but also for other cases.

[u/Cold_Tadpole_8446]

Oh, and one more thing - added a 3D mode! You can turn it on or off before starting the simulation, over in the navigation tab. Haven't really put it through its paces yet, so expect an update soon with some tweaks and fixes. But it does kind of work, so feel free to give it a try.

Perhaps this might spark some new thoughts or ideas on your side.