Map created before the first antarctic expedition that would have continuous communication back to the US over short wave radio relays. I stumbled on this in the Maritz Map Room of the Seattle Public Library.

Added an ADSB kinematics data exporter for aircraft tracking via adsb.lol. Here's an Osprey doing loops around LA.

Spent the last few days optimizing performance to support many channels. Here's me real-time tracking/searching every active satellite in orbit via celestrak.org w/ kinematics propagated at 1hz x ~100k channels. UI is super low latency and server is not breaking a sweat at ~6M updates per minute.

I wrote an exporter from my artificial pancreas loop system to the database. I can monitor glucose readings, automated insulin doses, etc., along with summary stats. I use tailscale to send data from my phone to the server, and can view from any machine connected to the VPN (like my laptop). #t1d

"F3: The Open-Source Data File Format for the Future"
db.cs.cmu.edu/papers/2025/...

A new contender to parquet. The most unusual aspect of the format is that it can embed WASM decoders directly in metadata, aiding portability and future-proofing. WASM is optional - perf looks OK, but size is meh.

I built out a binary format for the database, along with gzip/zstd compression (using gzip for now because safari is slow to adopt). A fully loaded channel is now 7.41KB per request. Can probably trim down slightly more with zstd dictionary training, but it's already very compact before compression.

Added t-digest to the db, which allow percentiles to be estimated with a fixed memory footprint per channel. This is useful for key stats like medians, but also allows me to generate approximate CDF/PDF plots for understanding value distributions. Aiming for ~4KB total footprint per channel sketch.

Added a search bar and a number of demo feeds I'm using for testing the database. Here's me searching for ISS telemetry, then checking a channel that tracks the volume setting on my macbook, which updates in real-time.

"Hello World!" from a new (very WIP) lightweight embedded database focused on online real-time statistics. The standalone executable is currently *9.94KB* compressed.

I was exploring RRDtool, a round robin timeseries database / plotting system, and came across this beauty. It's been around a while, so the gallery has many interesting examples: oss.oetiker.ch/rrdtool/gall...

I am releasing globe.c, a simple tool I wrote in C99 for parsing/manipulating the NOAA GLOBE global 1km resolution elevation dataset. Here is a brief writeup on the CLI, along with a demo site for the project.

morganherlocker.com/post/globe.c/
morganherlocker.github.io/globe.c/