Tokyo Haneda International Airport problem report #27868 (open)

I will send my report again in order to me more clear based on current csv format.

Subject: RJTT runway threshold discrepancies (AIP vs OurAirports)

RJTT AIP data vs OurAirports values do not match numerically

From the RJTT AIP:

RWY 16L threshold

Lat: 35 deg 33' 57.23" N

Lon: 139 deg 47' 11.59" E

From OurAirports:

16L Base Threshold

Lat: 35 deg 33' 57.24" N (very close)

Lon: 139 deg 47' 13.21" E (~1.62 arcsec off, approx 40 m)

This longitude difference is too large to be explained by rounding.

Reciprocal runway (34R) also shows inconsistency

RJTT AIP gives:

RWY 34R threshold

Lat: 35 deg 32' 22.90" N

Lon: 139 deg 48' 18.49" E

OurAirports shows:

Reciprocal Threshold (DER)

Lat: 35 deg 32' 33" N (~10.1 arcsec, approx 310 m difference)

Lon: 139 deg 48' 10.78" E (~7.7 arcsec, approx 190 m difference)

These are not small deviations and suggest a systematic issue.

Overall assessment

RWY 16L:

Latitude matches closely

Longitude shows a significant offset (~40 m)

RWY 34R:

Both latitude and longitude show large positional differences (~200-300 m)