Moving Files Phone to Phone With Nothing But a Screen
One handset blinks animated QR codes, the other films it, and a byte-identical file comes out. Fountain codes, because there is no back channel.
marshallfrith.com
Geospatial and tactical software, built from scratch.
Build logs and tutorials for satellite imagery tooling, TAK integrations, and field software that runs on your own machine.
Projects
All projects →Finding Ships in Radar, Without a Neural Net
A local SAR vessel detector built on free Sentinel-1 imagery. CFAR detection, a physics-based classifier, and an honest accuracy number.
Winds Aloft to 103,800 Feet, Without a GRIB Decoder
One wind service from the surface to a balloon burst, pure standard library, served straight into ATAK. The data gaps are output, not silence.
Crop Health From Orbit, Checked to a 25th of a Pixel
Draw a field, pick a Sentinel-2 pass, get NDVI you can walk to. The georectification is proven by six checks, because a misplaced overlay looks perfect.
A TAK Server in Pure Python, No TAK.gov Account
Cursor-on-Target over TCP and UDP, SQLite for state, a Leaflet dashboard, and a setup wizard that hands a new operator a QR code.
Live Bathymetry for Google Earth, ATAK, and a Chartplotter
Pick water, pull real NOAA depth data, get a colour-ramped depth map. One render, three containers, because every viewer disagrees about what KML means.
Who's writing this
I build software for people who work outdoors with a radio and a tablet: satellite imagery analysis, TAK integrations, and small tools that keep running when the network doesn't.
Support the work
Every project here runs on hardware I pay for and time I don't bill. If a tutorial saved you a weekend, a tip keeps the next one coming.