GPS Continuously Operating Reference Station (CORS) MSOL
- A Trimmark 3 radio broadcasts RTK (CMR+) at 460.3750 MHz from Point Six at a baud rate of 9600, with index number 0.
- RTK CMR+ corrections are also available via the ip address: 22.214.171.124:5017
Mapping data is available as RINEX files, which can be used for differential corrections. The files (in compressed exe format) are one hour long and named as per the start time in Universal Time Coordinated (UTC).
Survey data is available in 24-hour DAT files (in compressed exe format) named as per the Julian day.
The mapping and survey data files are archived by Missoula County and available via the links below. The survey data is also available through NGS UFCORS.
- CLICK THIS LINK FOR MAPPING DATA- RINEX files (last 30 days)
- CLICK THIS LINK FOR MAPPING DATA- RINEX files (last 365 days)
- CLICK THIS LINK FOR SURVEY DATA- DAT files (last 365 days)
- For concatenating two or more dat files, use: multidat.exe
- To use DAT files in Pathfinder Office, convert them to SSF files with: dat2ssf.exe
- CLICK THIS LINK FOR SURVEY DATA- RINEX files (from NGS Website)
MAPPING DATA / FILE FORMAT
- Observation data is available in RINEX format as compressed self-extracting files.
- Navigation data, as ephemeris files, are also available as compressed self-extracting files.
Filename: MSOLDDDH.exe where MSOL= station name; DDD= Julian day; H=hour in UTC time where A= first hour, B= second hour, etc.; .YYo= last two digits of the year and "o" for observation file;.exe=file extension for self-extracting compressed file.
Examples: MSOL157N.06o.exe started at 1:00 PM UTC, June 6, 2006 or
7:00 AM MDT, June 6, 2006. MSOL157A.06o.exe started at 00:00:00 UTC on
the 157th day of the year 2006, or 18:00 MDT, June 6, 2006.
NOTE FOR PATHFINDER OFFICE USERS (UPDATED 4/4/13). To facilitate the differential correction process using MSOL base station data you will need to set your Base Data Provider Properties. Under the Internet Server tab, the address format should be:
ftp://www.co.missoula.mt.us/pfcbs_arch/localuser/pfcbs_arch/MSOL%DDDDD%%HrAsLetter%.13o.exe The base server type should be CORS, station ID is MSOL, and Nav file address is the same:
ftp://www.co.missoula.mt.us/pfcbs_arch/localuser/pfcbs_arch/MSOL%DDDDD%%HrAsLetter%.13o.exe , since the nav file is contained in the compressed file. This should allow the software to automatically download the necessary files to perform differential correction of your rover files. You will need to change the date extension annually. From 12o to 13o in 2013, 13o to 14o in 2014, etc.
SURVEY DATA / FILE FORMAT
- Data is available in Trimble's .DAT format as compressed self-extracting files, each being 24 hours in duration.
Filename: MSOLDDD0.dat.exe where MSOL=station name; DDD= Julian day; 0= UTC start hour; dat= data file extension; exe= file extension for self-extracting compressed file.
Example: MSOL1570.dat.exe started at 00:00:00 UTC on June 6, 2006. This file would run until midnight UTC June 6, 2006.
STATION INFORMATION (NGS PID DE8232 & DN1840)
- Latitude of ARP: 46° 55' 45.83772" North
- Longitude of ARP: 114° 06' 31.84489" West
- Horizontal Datum: NAD83 (2011)
- Vertical Datum: NAVD88
- Height above Ellipsoid to L1 Antenna Phase Center (as per NGS): 3151.82 US Survey ft., 960.678 m
- Height above Ellipsoid to Antenna Base (as per NGS): 3151.61 US Survey ft., 960.612 m
- Orthometric Height of L1 Antenna Phase Center (by calculation): 3200.91 US Survey ft., 975.639 m
- Orthometric Height of Antenna Base (by differential levels): 3200.72 US Survey ft., 975.581m *
- Receiver: Trimble NetR5
- Antenna: Trimble Zephyr Geodetic 2 RoHS TRM 57971.00
- Mapping Data epochs: SYNC measurements = 1 second; Positions = 15 seconds
- Survey Data epochs: 15 seconds
- Mask = 0°
- Receiver operates 24 hours/day, 7 days/week
The orthometric height of the ARP was determined by 3-wire differential leveling to NGS benchmarks G 14 Reset and R 446, using a Zeiss Ni2 level, to be 975.587m on July 15, 2003.
*An orthometric height of the ARP was determined using first-order equipment and methods to be 975.581m. That level run will be submitted to NGS for publication.
For information about the antenna, go to the NGS site: ANTENNA
This station is part of the National CORS Network. For more information about this station, visit: MSOL
To download a PowerPoint presentation about establishing this CORS, given in Helena, 7-22-03, click: MSOL CORS
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