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Global Positioning System> CBS Files for Download

CBS Files

Graphic image of the USDA Forest Service shield logo.PORTLAND, Oregon Community GPS Base Station

CBS Year Month Date (from) Date (to)

Note: If your query yields a blank page check the above form for correct data entry. If it is still blank then there is no data available for the requested times or there is a problem with the search.

Alternatively, click below for a full listing of all reference files available from this website for this CBS.

Display all files available at USFS/BLM Portland CBS

Display all RINEX files available at USFS/BLM Portland CBS


  • Latitude: 45 31' 12.297" North
  • Longitude: 122 40' 22.927" West
  • Horizontal Datum: WGS84
  • Elevation: 37.21 meters above ellipsoid
  • Receiver: 12 Channel TRIMBLE Maxwell chip receiver
  • Tracking epoch (sec.): Position at 5 seconds; SYNC measure at 5 seconds
  • The antenna survey monument located in reference to the Oregon HARN.
  • Trimble Reference Station v 1.02 software


  • Contact Person: Aaron Dick, Mobile GIS Lead
  • Address: BLM Oregon/Washington State Office, 333 SW First Avenue, Portland, OR 97208
  • Telephone: BLM: 503-808-6601
  • E-Mail:


  • Data is available in receiver dependent Trimble .SSF format. RINEX is not supported at this time.
  • File name: PYMMDDHH.EXE where P=Portland; Y=year; MM=month; DD=day; HH=hour in GPS time; .EXE files are compressed and self-extracting. File length is one hour.
  • Data is kept 3 months before being removed from data storage.
  • Operation is 24 hours, 7 days per week. File transfer is 5 minutes after the hour for all systems.
  • This CBS is co-managed by the BLM and USFS.

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