metrics: replace naive elevation accumulation with hysteresis dead-band

GPS jitter and barometric quantization noise caused systematic overestimation
of elevation gain — in extreme cases 100% of reported gain was sub-1m noise.

Implements source-aware hysteresis: elevation is only committed when it
deviates from the last committed value by ≥5m (barometric) or ≥10m (GPS/GPX/TCX).

- ParsedActivity gains `altitude_source` field ("barometric"/"gps"/"unknown")
- FIT parser sets "barometric" when enhanced_altitude is present, else "gps"
- GPX and TCX parsers always set "gps"
- metrics._elevation() uses the threshold matching the source
- 5 new parametric tests covering flat GPS noise, threshold differences, and real climbs

This commit is contained in:

Davide Scaini

2026-04-20 20:29:20 +02:00

parent 696f538f56

commit 872651f471

6 changed files with 117 additions and 9 deletions

									
										bincio/extract/parsers/gpx.py
									
		+1
		
												View File
												
				@@ -53,6 +53,7 @@ class GpxParser(BaseParser):

				            started_at=started_at,

				            source_file=path.name,

				            source_hash="",  # set by factory

				            altitude_source="gps",

				        )