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Barometric Altitude Datalogger-Advance Information-NMEA
data logger Track Logger
Why
Use Barometric Altitude? Barometric Altitude is becoming popular with many GPS users because it generally provides a smoother and more stable result than GPS altitude. This is valuable when GPS signals are masked by objects such as mountains, trees or buildings. For example, in 'urban jungle', multipath effects caused by large buildings can degrade GPS altitude accuracy Compatability
with GPS Receivers This Datalogger is designed for, but not limited to, Garmin GPS receivers with a built-in barometric altimeter. Suitable barometric altimeter models are eTrex Summit, eTrex Vista and GPSMap76S. For other GPS receivers, this Datalogger can record GPS altitude. Why
a special Datalogger model for Barometric Altitude?
Garmin GPS receivers send Barometric and GPS altitude in different NMEA sentences. GPS altitude is sent in the $GPGGA sentence. Barometric altitude is sent in the $PGRMZ sentence. Can
I choose to store GPS altitude if I want to?
This Datalogger can store either GPS or Barometric altitude. The type of altitude stored (GPS or Baro) can be selected anytime, in the field, by setting a switch. This allows use with GPS receivers that do not have a barometric altimeter. What
data is saved?
This Datalogger saves position, time, date and altitude information. Can
Waypoints be saved?
There is an Event button on the Datalogger which will generate a waypoint marker when pressed. Also, two External Event inputs are provided, each is separately identified in the output data file. This makes a total of three separately identifiable Event (or Waypoint) sources. What
is the track point capacity of these Dataloggers?
We stock the SRVY-XM4-BARO21 model which can store 288,200 points.
Example Altitude Profiles:
Both of the profiles below were taken simultaneously, using two dataloggers. One Datalogger was set to record barometric altitude, the other was set to record GPS altitude. The GPS receiver was a GPSMap76S, software 2.01, with an external antenna. The spikes in the GPS Altitude plot were likely caused by multipath or satellite masking. We hope to provide a more comprehensive set of examples soon.
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Prairie
Geomatics Ltd.™ (map) 5 Bison Hills Rd. P.O. Box 141 Minnedosa, Manitoba Canada R0J 1E0 www.gpszone.ca |
Hours of Operation: Online/Fax: 24/7 Phone: 9am-6pm |
