GNSS Continuously Operating Reference Station Data
RTK CMRx corrections are available via the ip address: 161.7.1.8:5016. Includes GPS, GLONASS, & Galileo
RTK CMR+ corrections are available via the ip address: 161.7.1.8:5017.
RTCM 3.x corrections are available via the ip address: 161.7.1.8:5018.
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 NetR9.
- Antenna: Trimble Zephyr Geodetic 2 RoHS TRM 57971.00.
- Survey Data epoch: 1 second.
- Mask = 5°.
- Receiver operates 24 hours per day, 7 days per 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.
RTK CMRx corrections are available via the ip address: 209.200.195.67:5016.
RTK CMR+ corrections are available via the ip address: 209.200.195.67:5017.
RTCM 3.x corrections are available via the ip address: 209.200.195.67:5018.
STATION INFORMATION (NGS PID DN6069 & DN6070)
- Latitude of ARP: 46° 45' 46.24773" North.
- Longitude of ARP: 114° 05' 48.67207" West.
- Horizontal Datum: NAD83 (2011).
- Vertical Datum: NAVD88.
- Height above Ellipsoid to L1 Antenna Phase Center (as per NGS): 3641.47 US Survey ft., 1109.922 m.
- Height above Ellipsoid to Antenna Base (as per NGS): 3641.25 US Survey ft., 1109.856 m.
- Orthometric Height of Antenna Base, or Antenna Reference Point (ARP).
- By calculation: 3689.6 US Survey ft., 1124.59 m.
- Receiver: Trimble NetR9.
- Antenna: Trimble Zephyr Geodetic 2 RoHS TRM 57971.00.
- Data measurement interval: one second.
- Mask = 5°.
- Receiver operates 24 hours per day, 7 days per week.
Monuments and Control
- Missoula County Google Earth (10-31-2022) - This file contains PLSS corners, street intersection monuments, and a few miscellaneous other monuments we have surveyed and determined NSRS based positions. This file also contains NGS marks: including CORS, HARN, Benchmarks, and others. Do not rely on the positions provided from within Google Earth. Contact us the most accurate positions.
- Control Point Datasheets - This file contains information about most of the PLSS corners and street intersection monuments. The page number is the point number in the Google Earth file above. Points 1-4999 are primarily street intersections, with a few oddballs thrown in. Points 5000 and above are primarily PLSS corners. There are a few exceptions. WD## points are Water Quality District monitoring wells.
- Monument Photos - This file contains photos of many of the points from the Control Point Datasheets mentioned above. The photo names correspond to the point numbers and follow, more or less, NGS photo naming conventions.
- Lake Benchmarks with Mean Annual High Water Elevations - This file contains the most recent benchmark datasheets. The benchmark datasheets contain information relating to the Missoula County Shoreline Regulations. The Shoreline Regulations govern development adjacent to certain lakes. For more information on the Shoreline Regulations, contact Floodplain Administration.
- City Field Books - This is a compressed file of field books circa 1909-1912, and one from 1952. Included in the file is an index.
GLO/BLM Survey Plats
The Surveyors office has paper copies of most of the GLO/BLM surveys in Missoula County. We have all the notes for the County on micro-fiche. There is a micro-fiche viewer available in the office, but it does not print. There are also paper copies of all the GLO/BLM survey plats for the County. These plats are bound in large books and are very difficult to copy.
EDM Calibration Line
The Electronic Distance Measuring Instrument (EDMI) Calibration Line is located near the Missoula International Airport. A new line constructed by Missoula County in 1999, and measured in 2002, replaces the 1985 line and is located approximately 30 feet northeasterly of the 1985 line. The following is a link to the NGS page containing information for all calibration lines in Montana.