About Civil Engineering GPS
The Community Base Station files are for PATHFINDER System users.
The Civil Engineering Department provides Trimble Navigation, Ltd. PATHFINDER GPS Community Base Station
files (CBS) files for:
Latitude - 32 deg 16 min 48.07800 sec (32o16'48.07800")
Longitude - 106 deg 45 min 18.1763 sec (106o45'18.1763"
Altitude - 1176.201 Meters HAE
Datum - NAD 83
About our GPS Setup
The GPS antenna is located on the roof of Engineering Complex II of New Mexico State University. This
location was surveyed by Dr. James P. Reilly of New Mexico State University's Department of Surveying,
using a Trimble 4000 ST carrier phase GPS receiver positioned on one Border NGS control point. The CBS
files on the Civil Engineering BBS can be used for differential correction within roughly a 300 mile radius (see map at left) of the location given above.
New Civil Engineering Community Base Station (CBS) files are collected continuously each day, and new files appear on our ftp site weekly, when Percy Walls (network administrator) can sort and upload them.
About Our Base Station:
We have a 12 channel Trimble receiver with one end hooked to an antenna on the top of our building and
the other end hooked to a computer running Trimble Navigation's PathFinder Community Base Station (PFCBS) v2.32 software.
The system is running on a 400 MHz computer with Windows XP. The computer is logged into the network to a Sun-Blade running Sun-OS v8 and Samba client software. This allows the Windows XP machine to attach to the Sun Unix platform as though it were a MS-DOS network drive. The files are written directly to the Unix platform in their raw .ssf format. After the file has closed, a Unix script file, archives the raw .ssf file to a .ZIP file for storage and transmission. the Unix zip command used is compatible with PKZIP/PKUNZIP from PKZ204G, and most of the windows ZIP programs.
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