88 lines
3.0 KiB
Markdown
88 lines
3.0 KiB
Markdown
# Advisory Circular
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This is a twitter bot that alerts you when any aircraft is circling.
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You can see it in action at
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[@SkyCirclesLA](https://twitter.com/SkyCirclesLA).
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## Prerequisites to running the bot
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**Set up a Pelias instance containing information for the geographical
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area you're interested in.** See https://github.com/pelias/docker and
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if you're lucky the `projects` folder will have a predefined project
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that covers the area you want. I run one using the `los-angeles-metro`
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project.
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**Get an API key for adsbexchange.com.** See
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https://www.adsbexchange.com/data/ If you have a receiver and feed
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them data, they'll give you a key for free. Alternately, find another
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data source of realtime (or not) aircraft data and massage it into a
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form that the bot can work with.
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**Get access keys for a twitter account.** Follow the [instructions at
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botwiki](https://botwiki.org/tutorials/how-to-create-a-twitter-app/).
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## Running the bot
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Put your adsbexchange.com API key and twitter keys in `secrets.yaml`.
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Create an initial history database: `echo '{}' > advisory-circular.db`
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Install node dependencies:
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`npm install`
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Compile the clojurescript:
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`npx shadow-cljs compile script`
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Run the bot:
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`node out/script.js --url https://adsbexchange.com/api/aircraft/json --lat <lat> --lon <lon> --radius <radius>;`
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Specify your geographical region of interest by specifying a circle at
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`<lat>`, `<lon>` with a radius of `<radius>` miles.
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The bot will run once. The adsbexchange.com API only provides
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instantaneous positions, so the bot will have to run many times and
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collect some history before it's able to detect any circles.
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```
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while :
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do
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node out/script.js --url https://adsbexchange.com/api/aircraft/json --lat <lat> --lon <lon> --radius <radius>
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sleep 10
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done
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```
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* Do not run the script with a large radius, or adsbexchange.com will
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ban your IP. I use a radius of 40 miles.
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* Do not run the script more ofen than once every 10 seconds, or
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adsbexchange.com will ban your IP.
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## To do
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- [ ] If we don't have neighbourhood or locality (just county), try to
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use the locality of a nearby venue. E.g. "2 miles from
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Glendale."
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- [ ] Solve the issue of needing a differently sized buffer zone for
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different airports--2 miles distance from LAX is still
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practically inside the aiport. Add list with custom airport
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coords and radii? Get access to OSM polygons and compute our own
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distances?
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- [ ] Lookup registration info. Possible sources: FAA,
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adsbexchange.com, janky-ass basestation.sqb's that have been
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passed around for a decade.
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- [ ] Add type information to tweet status, e.g. "Eurocopter AS350".
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- [ ] Use Wikipedia graph to rank landmarks? More inbound links to a
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page = higher significance?
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- [ ] Add support for Mastodon/ActivityPub.
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- [ ] Generate our own maps instead of using adsbx's? The adsbx map
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isn't always in sync with the data from the API.
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- [ ] Run at global scale!
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