GPS Base Data

As a service to the GPS Community The WILKES UNIVERSITY GPS base station collects measurements to allow users with sub-meter capable equipment and appropriate software to achieve sub-meter results. Base files are generated five minutes after the top of the hour, and about four months of BASE files are available at any time.

Accessing BASE Data

The data collected for differential correction purposes is available via a FTP Username: Wilkes_Base and password GPS_4000sse.

Hours of Base Station operation are 7 days a week (6am-8pm)

File Naming Conventions

If you wish to download hourly BASE files, the file name scheme is thus:

Where:

yy is the last 2 digits of the year -
mm is the two-digit month - from 01 for January to 12 for December.
dd is the two-digit day
hh is the two-digit hour, which ranges from 00 to 23. The hour is based on GPS time. Our area is 5 hours behind GPS time during standard time, and 4 hours behind when in daylight savings time, so the GPS hour 14 corresponds to 9am EST or 10am EDT.

Configuration

Wilkes University's Base Receiver Trimble 4000SSE Using Trimble's TRS software as the base data collection software

Trimble Pathfinder Office Setup information

Users who wish to use Trimble Pathfinder office automatic base station data download can select new under the base locator dialog and then the add details yourself check box. Add the following address to the internet server tab ftp://locust.gis.wilkes.edu/%YY%%MM%%DD%%HH%.zip. In the security tab choose restricted access and add the following: username: Wilkes_Base and the password: GPS_4000sse. The reference position will be used from the .ssf file.

OTHER FILE FORMATS ARE AVAILABLE

The base station also collect base files in RINEX and .DAT format. User desiring these file types should contact Bill Toothill @ 408.4616 for details to download these files.

Reference Position

LATITUDE / LONGITUDE
LAT (N) 41 deg 14 min 42.212331 sec
LON (W) 075 deg 53 min 20.683646 sec
Elevation 153.07 meters HAE (height above ellipsoid) to phase center of antenna
Elevation: 608.97feet. (MSL) Mean Sea Level

UNIVERSAL TRANSVERSE MERCATOR (UTM ZONE 18) NAD83
N 4,566,342.576m
E 425,504.337m
Elevation: 608.972ft. (MSL) Mean Sea Level

STATE PLANE (Pennsylvania North 3701) NAD83
N 398,408.651 USft.
E 2,480,215.138 USft.
Elevation: 608.972ft. (MSL) Mean Sea Level

positional values: 1st. order survey quality
Antenna: L1/L2 Geodetic with ground plane

Disclaimer

Wilkes University provides this data as a convenience for user of GPS. As a result no responsibility is assumed for damages or other expenses due to the use or misuse of the data.