Japan airport problem reports

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)

I updated all runway threshold and displacements based on more precise Bing maps and Google maps coordinates.

Line | Status | Source | le_ident | le_latitude_deg | le_longitude_deg | le_displaced_threshold_ft

-------|-----------|---------------|----------|------------------|------------------|---------------------------

32208 | Incorrect | Our Airports | 16L | 35.565899 | 139.787009 |

32208 | Correct | RJTT AIP | 16L | 35.56589722 | 139.78655278 | 1280

I updated all runway coordinates and displacements to the best of my knowledge. The coordinates cited from RJTT AIP define the runway endpoints but not the threshold.

I don't think the airport exists, or the location is incorrect.

Plan to reject this report, airport is "closed" because it no longer exists.