Telemetry Map Editor

What this is. A map-first editor for the telemetry of a survey flight recorded as several clips. Each clip's telemetry (DJI SRT / ASS, the subtitle track inside a DJI MP4/MOV, GPX, KML/KMZ, CSV) is read by the same engine as the Telemetry Extractor; a video is only opened to pair it with its sidecar and give a duration — it is never re-encoded, cut or uploaded. The clips are joined into one track with two clocks: the device's own time on every fix, untouched, and the project time of the combined video, in which a gap between clips is kept, removed or set by hand at each boundary — never decided silently. Click the track twice to set Point-1 and Point-2, then say what the stretch between them is: a bypass (five explicit outcomes), an alignment change, a removal, a bridge across a gap, or a replacement with telemetry generated along the design alignment — positions distributed along the alignment's geometry between the two chainages on the original timestamps, flagged DERIVED_ALIGNMENT, with the original recoverable. What goes out. An SRT in the clips' own dialect with sequential cues and valid timing; GPX; CSV with provenance, source file, both clocks, chainage and offset on every row; KML/KMZ with the original, edited, bypass and point layers. Export refuses while validation finds a serious problem. A project file keeps the references, decisions and edit log — not the footage — and reopens when the same files are chosen again. Everything runs in the browser; nothing is uploaded.