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  DATA SUMMARY
  GPS (Global Positioning System) data at Bangkok, Thailand
 
DOCUMENTATION ACCESS DATA

Summary
This data set produces GPS raw data called RINEX (Receiver INdependent EXchange format) files, containing clock information for microwave propagation between GPS satellites and an antenna. The GPS antenna has been on the roof of the building of TMD (Thai Meteorological Department) headquarter office in Bangkok, Thailand since August 2001 (now in progress). Time interval of the raw data is 30-second. Originally this site had been established within the framework of the Gewex Asia Monsoon Experiment-Tropics (GAME-T) project and has been operated in JAMSTEC/IORGC research project now.
(NOTICE)
In order to estimate precipitable water vapor from the GPS raw data, it's necessary to calculate atmospheric delay by using GPS analysis software, and then translate the atmospheric delay to precipitable water vapor by using surface pressure and temperature, which have been observed by TMD. Time interval and estimated value of the atmospheric delay depend on parameter settings of the analysis software. Now the JAMSTEC/IORGC research project has GIPSY-OASIS and Bernese software licences.

Summary table
1) Data format
   ASCII text files (RINEX files)
2) Spatial coverage & resolution
   Longitude:100.61E, Latitude:13.67N, Elevation:28m a.s.l.
   (NOTICE)
   The GPS antenna receives microwave signals from all satellites above the horizon (actually low elevation angle signals are excluded in the calculation process because of high noise). Therefore, the GPS data represents approximately 20km horizontal scales.
3) Temporal covergage & resolution
   since August 2001, every 30-second
4) File size (total)
   2MB/day, 700MB/year

Citing data
http ://www.jamstec.go.jp/iorgc/hcorp/data/

References & related publication

  • Wu, P., J.-I. Hamada, S. Mori, Y.I. Tauhid, M.D. Yamanaka, and F. Kimura, Diurnal variation of precipitable water over a mountainous area of Sumatra Island. J. Appl. Meteorol., 42, 1107-1115, 2003.

   
DATA CONTRIBUTOR & GROUP
Peiming Wu, Taichi Sasaki (Large-scale Hydrological Cycle Group)

PARAMETERS
RINEX DATA (CLOCK INFORMATION OF GPS MICROWAVE PROPAGATION)

INSTRUMENTS
CHOKE RING ANTENNA
Z-XTREME RECEIVER

   
 
Institute of Observational Research for Global Change