PLATEAU Odaiba browser scene

City geometry: Project PLATEAU, Ministry of Land, Infrastructure, Transport
and Tourism (Japan), Tokyo 23 wards 2022 CityGML, CC BY 4.0.
https://www.geospatial.jp/ckan/dataset/plateau-tokyo23ku-2022
https://creativecommons.org/licenses/by/4.0/
Modified by gnss_gpu contributors: highest LoD per feature component,
constrained triangulation preserving holes, reported GEOS linework repair,
geoid height conversion and ECEF-to-local-ENU transformation. No mesh
decimation or coordinate quantization. Original file hashes are in manifest.json.

Trajectory and navigation: UrbanNav-TK-20181219 Odaiba, IPNL-POLYU UrbanNavDataset.
https://github.com/IPNL-POLYU/UrbanNavDataset
MIT license and copyright notice: UrbanNav-LICENSE.txt in this directory.
Reference: Applanix POS LV620 reference.csv. All 12,410 ECEF poses retained.
Navigation: DLR/TUM CONGO/MGEX merged broadcast RINEX base.nav; GPS, Galileo E1, BeiDou B1 (including GEO), QZSS, and GLONASS L1 used here.
Time conventions and fields: https://files.igs.org/pub/data/format/rinex303.pdf
Galileo orbit/time: https://www.gsc-europa.eu/sites/default/files/sites/all/files/Galileo_OS_SIS_ICD_v2.1.pdf
BDS orbit: BDS-SIS-ICD-B1I-3.0, section 5.2.4.1 (GEO and MEO/IGSO).
The controlled geometric fit assumes ideal inter-system clock corrections.

Height correction: Geospatial Information Authority of Japan (GSI),
Japan geoid 2011 (GSIGEO2011), version 2.1. Bilinear interpolation on the
one arc-minute by 1.5 arc-minute source grid. Used offline for research;
the original geoid grid is not redistributed.
https://web1.gsi.go.jp/buturisokuchi/grageo_reference.html
https://www.gsi.go.jp/buturisokuchi/grageo_geoidprocedure.html

This is a cross-year geometric reconstruction of a 2018 reference drive and
a 2022 city model, not a reproduction of the exact historical street scene.

Optional live base map: Copyright OpenStreetMap contributors, ODbL.
https://www.openstreetmap.org/copyright
https://opendatacommons.org/licenses/odbl/
OSM Standard raster tiles are requested only for the displayed camera view,
with normal browser caching and visible attribution. They are not bundled
or downloaded for offline use. OSM supplies display context only; the PLATEAU
signal geometry and reference trajectory are not modified using OSM data.

GLONASS: RINEX 3.03 Appendix A10; Float64 RK4 with J2 and broadcast acceleration.
UTC to GPST uses the recorded 2018 offset of 18 seconds; nominal PZ-90.11/WGS84 alignment.
Orbit equations: https://github.com/tomojitakasu/RTKLIB/blob/master/src/ephemeris.c

Recorded strength: UrbanNav Odaiba rover_trimble.obs and rover_ublox.obs, first-band numeric Sxx fields only, original GPS timestamps and values without resampling. Source and exported-file hashes are in strength-manifest.json. Missing/zero fields are omitted, never converted to zero reception. The source RINEX 3.02 headers omit SIGNAL STRENGTH UNIT; dB-Hz is inferred from RTKCONV 2.4.3 b31 producer convention, not independently calibrated. BeiDou S1I is the legacy 3.02 B1I code (3.03 S2I). Galileo tracking differs: Trimble S1X versus u-blox S1C. These observations do not calibrate the geometric/relative-power model or positioning. UrbanNav MIT attribution above applies. Rebuild: python tools/build_browser_recorded_strength.py.