UNAVCO

UNAVCO Polar Project

GNET

ANET

• Various networks with standardized equipment and maintenance
• 1-second rate
• GPS + GLO

OFFLINE

CORS

• Very dense U.S. network
• 1, 5, 15, 30-second sampling rates
• Mainly GPS + GLO

IGS

• Collection of monitoring stations from other institutions
• Some new data here, but need to be careful about data overlap
• Unsure of rate of old data -- seems to vary
• Has the most multi-GNSS: GPS+GLO+GAL+BDS+QZSS

Getting Station Coordinates

UNAVCO:

​ftp://data-out.unavco.org/pub/products/position/gage_gps.igs08.txt

CORS:

ftp://cors.ngs.noaa.gov/cors/coord/coord_08/igs08_geo.comp.txt

IGS:

- I copied a table I found online into a text file located here:

/media/share/brianbw/igs-stations.txt

Getting Station Data

UNAVCO:

ftp://geodesy.noaa.gov/cors/rinex/<yyyy>/<doy>/<station_id>/<*.o>

CORS:

ftp://data-out.unavco.org/pub/rinex/obs/

<yyyy>/<doy>/<station_id>/<*.o>

IGS:

ftp://cddis.gsfc.nasa.gov/pub/gps/data/daily/<yyyy>/<doy>/<yy>o/<station_id><doy>.<yy>o.Z

Getting Station Data

class FTPDownloader

class DataFileManager

• Takes path expression (e.g. /<yyyy>/<doy> for path of 4-digit year followed by day-of-year)
• Automatically substitutes correct date and station parameters in path expression
• Mirrors FTP site locally (e.g. on the work server)

• Uses DataFileManager
• Automatically downloads and extracts data from FTP site
• Will check if data already downloaded

Getting Station Data

FTPDownloader

DataFileManager

• See GITLAB: brianbw/data-utils

• I use these utilities for **all** FTP data
  • SP3 files
  • DCB files
  • ANTEX files
  • IONEX files
• Automates workflow
  • don't have to worry about
    • "do I still have that data downloaded?"
    • "I need to change to different date..."