splitAtAntimeridian works from which COPY of the world each longitude is
in, so it needs a series that runs past ±180 rather than jumping back.
greatCirclePoints produces one; a satellite ground track does not — SGP4
reports every longitude inside (−180, 180]. A track leaving Kamchatka at
+179.9 and arriving in Alaska at −179.9 therefore looked like a single
359.8° step inside one world, no split was made, and the polyline drew
the chord: a straight dashed line clean across the map on every crossing.
The series is now unwrapped first. A jump of more than 180° between
consecutive points is that wrap and nothing else — no real path steps
half the globe between samples — and the unwrap is idempotent, so the
great-circle caller is unaffected.
Checked on three series: a normalised crossing now yields two segments
meeting exactly at ±180 where it used to yield one chord; an already
continuous 170→183 still splits at 180; a track that never crosses comes
back untouched.
Backend (Go 1.25 / Wails v2):
- QSO storage on SQLite (modernc) with embedded migrations (0001..0005)
- Streaming ADIF import (batch insert) + WorkedBefore per callsign and DXCC
- Callsign lookup with QRZ.com + HamQTH providers (primary/failsafe routing)
and SQLite-backed TTL cache
- DXCC resolver from cty.dat (auto-download, longest-prefix-match)
- Multi-profile operator identities (home/portable/SOTA/contest) — every
QSO stamps MY_* from the active profile
- CAT control via OmniRig COM on a single OS-locked goroutine, with
bidirectional sync (freq/mode/band/split/VFOs) and Rig1/Rig2 hot-swap
- Settings store (key/value), CAT debug log at %APPDATA%/HamLog/cat.log
Frontend (React 18 + TypeScript + Tailwind v4 + shadcn-style):
- Single-row entry strip with CAT-aware band/mode/freq, RST, Start/End
UTC, per-field locks (band/mode/freq/start/end) for backdated QSOs
- Topbar: live freq (MHz.kHz.Hz dotted), live UTC, band/mode/SPLIT badges,
CAT pill with rig selector and clickable Azimuth pill (rotor TODO)
- Settings tree: Profiles (Log4OM-style manager), Station Information
(edits the active profile), unified Callsign Lookup with Test buttons,
Bands/Modes lists, CAT
- Worked-before matrix (band × mode × class) with new-DXCC highlighting
- ADIF import from menu + Maintenance > Refresh cty.dat
Co-Authored-By: Claude Opus 4.7 (1M context) <[email protected]>
rouggy
