San Juan County makes no warranties, expressed or implied as to the accuracy,
completeness, reliability, or suitability for any particular purpose of information or data
contained in or generated from the SJC Base Station. Furthermore, San Juan County or any
employee thereof assume no liability associated with the use of these data, and assume no
responsibility or maintain them in any manner or form.
San Juan County Government has provided Global Positioning System (GPS) Base Station reference files
to the public, free of charge. The differential correction files are provided in DAT format and direct
downloading is available from within Pathfinder Office software. These file can also be utilized in
Trimble Geomatics Office, Trimble Total Control and Trimble Business Center software. To use this data
with other GPS/GNSS manufactures (Leica, Topcon, Sokkia, Ashtech, etc.) please download this free
utility (See link below) that will convert these DAT files to a generic RINEX (Receiver Independent
Exchange) file.
http://www.trimble.com/trimblerinex_ts.asp
San Juan County Global Positioning System
Base Station Description:
Site Location
City
:
Aztec
State
:
New Mexico
Receiver Type
:
Trimble 5700
Software
:
Trimble GPS Base Version 2.700
:
Zephyr Geodetic
Latitude
:
36°49'21.33317"N
Longitude
:
108°01'18.52495"W
Ellipsoid Height
:
1,696.432m(to Bottom of Antenna Mount on Zephyr Geodetic)
the position is NAD83
Project Datum
:
NAD83 (CORS)
Receiver Information
Antenna Information
Antenna Type
Position
Pursuant to accuracy classifications Federal Geographic Data Committee- Geospatial Positioning
Accuracy Standards Part 2: Standards for Geodetic networks. (FGDC-STD-007.2-19
Network Accuracy of SJCGISbase1
95% Confidence Interval
Horizontal =
0.010 m
Vertical (ellipsoid Height)=
0.005 m
Logging Parameters:
Elevation Mask:
10 degrees
Logging Rate:
1 second
File Length:
1 hour
File Availability:
1 year
File Organization
Local day
File type:
DAT
RefData/ .dat / .dat zip files (yr/month/day/time)
Day, Month, Day of Month, Year, Hour
Description of Station:
Installed on a Metal building, mounted on a steel/metal tripod (pictures provided below)
Installation Date:
10/30/2006
Operational Date:
11/8/2006
On-Site, Point of Contact Agency Information:
Agency :
San Juan County Government- Geographic Information Systems
Mailing Address:
100 S. Oliver, Aztec New Mexico 87410
Primary Contact:
Evan O’Keefe
Telephone:
505.334.4585
Email:
[email protected]
Secondary Contact:
Sandi Spencer
Telephone:
505.334.4310
Email:
[email protected]
NOTE: San Juan County hired JMAS – Johnson Mapping and Surveying, LLC in the May of 2011 for
certification of accuracy on San Juan County’s GIS Base Station # 1. Certification is attached for
reference:
CONTROL SURVEY REPORT
San Juan County GIS Base #1
FINAL ADJUSTED COORDINATES:
sjcgisBase1
NAD83 (CORS)
lat = 36°49'21.33317"N
long = 108°01'18.52495"W
Ellipsoid Height 1,696.432m (to Bottom of Antenna Mount on Zephyr Geodetic)
NETWORK CONSTRAINING MONUMENTS:
GPS Continuously Operating Reference Stations (CORS).
See attached Datasheets for NGS positions.
AZCN
P028
P011
P012
FIELD METHODS AND EQUIPMENT USED TO CONDUCT THE CONTROL SURVEY.
GPS Observations from control stations obtained from NGS CORS RINEX download for GPS
date 2011 julian day #123.
Observations for San Juan County GIS Base Station (https://maps.sjcounty.net/BaseData/) from
download of Hours 18-23 for May 2, 2011, and hours 0-17 for May 3, 2011.
Equipment for CORS stations referenced in Station Log files. Station at sjcgisBase1 observed
DATE OF OBSERVATIONS 2-3 May, 2011.
DATE OF ADJUSTMENT 20 May, 2011 See attached Network adjustment report for
Summary.
Pursuant to accuracy classifications Federal Geographic Data Committee - Geospatial
Positioning Accuracy Standards Part 2: Standards for Geodetic Networks. (FGDC-STD-007.21998)
Network Accuracy of SJCGISbase1
95% Confidence Interval
Horizontal
= 0.010 m
Vertical (ellipsoid Height) = 0.005 m
RVEY O R
D
R E GI ST E
N
N
I, DAVID A. JOHNSON, A NEW MEXICO REGISTERED PROFESSIONAL
SURVEYOR, CERTIFY THAT THIS CONTROL SURVEY REPORTD A. JOHNS
I
O
WAS PREPPARED BY ME OR UNDER MY DIRECT SUPERVISION,
AV
MEXIC
THAT THIS SURVEY IS TRUE AND CORRECT TO THE BEST OFW
MY
O
E
KNOWLEDGE, INFORMATION AND BELIEF, AND THAT THIS SURVEY
AND PLAT
MEET THE MINIMUM STANDARDS FOR SURVEYING IN NEW MEXICO.
14827
SU
2011-05-23
L
RE
_________________________________________________ D
A
PR
DAVID A. JOHNSON N.M. LICENSE NO. 14827
DATE
O FE S S I O N
sjcgis001_01.mxd 2011_05_2
JMAS
JOHNSON MAPPING
AND SURVEYING, LLC
PO BOX 2174,
FARMINGTON NM 87499-2174
505-360-8029
[email protected]