The learner will Define the terms GPS, GIS, triangulate and geo-referencing.
Generate a list of GPS/GIS applications in everyday life.
These satellites send a continuous stream of signals to the surface enabling a receiver to determine its height and location above the Earth.
SATLOC uses geometry to correct the signals based upon the curvature of the Earth and other factors, and sends location data back to the GPS unit.
ArcView 3.1 is the industry standard for GIS computer programs.
Students participating in the Chihuahuan Desert Lab course will use GPS/GIS to investigate some resource management issues at Carlsbad Caverns and Guadalupe Mountains National Parks.
When you have finished walking around the parking lot boundary, tap the GPS icon to stop collecting data.
ch2 The NAVigation Satellite Timing and Ranging (NAVSTAR) GPS is an all weather, radio based, satellite navigation system that enables users to accurately determine 3-dimensional position, velocity, and time worldwide.
The overall system consists of three major segments: the space segment, the ground control segment, and the user segment.
The ground control segment consists of a master control center and a number of widely separated monitoring stations.
The user segment is the collection of all GPS user receivers (such as your Motorola Oncore GPS Receiver) and their support equipment.
Signals are transmitted at two L-band frequencies, L1 and L2, to permit corrections to be made for ionospheric delays in signal propagation time in dual frequency receivers.
ch6
Transfer Wizard: This wizard walks you through any data transfers or uploading and downloading routes, waypoints and tracks between your computer and GPS receiver.
Upload/Download Routes: These operations also deal with waypoints but also transfer the route data or the links that make the individual waypoints into one route.
You can customize Track Console for your own environment in the following five areas: Readout: The real-time data that is displayed from various NMEA devices.
Track Console accepts data streams from any NMEA 0183 standard device, such as a depth sounder and wind speed gauge that transmits any of the NMEA sentences that the Console listens for.
gps
This booklet introduces techniques for using input from Global Positioning System (GPS) receivers in TNTmips®, TNTedit®, and TNTview®.
The process moves the GPS cursor around the boundary of the field according to the stream of GPS coordinates and the timing information in the log file.
One of the most useful features of GPS support in the TNT products is the ability to create line and polygon elements directly from GPS input.
Thus you could trace hiking trails from a GPS log file carried by hikers, or have a team drive the boundaries of a field to define its usable area.
galmar
Galaxy enables users to access the highly reliable In m a r s a t - C two-way messaging serv i c e f rom virtually anywhere in the world.
Tr i m b l e's award winning chip-level GPS integration provides a highintegrity position re p o rt i n g facility that can be tailored to a wide range of vessel management and monitoring applications.
T h rough an integrated Enhanced Group Call (EGC) re c e i ve r, vessels can re c e i ve regional Sa f e t y N E T weather and safety bro a d c a s t s at no charge.
Locus Timing99 http://www.timingtechnologies.com/Locus Timing99.PDF
Advances in Loran receiver technology, coupled with newer NELS and FERNS chains and planned upgrades to the North American stations, has made Loran as high a quality primary timing reference as GPS, and it can be superior in many circumstances.
For example, Loran can provide near Cesium clock quality at the receiver site, can generate UTC, and can penetrate urban environments difficult for GPS reception.
The TDEV is presented for the three receivers tested in Figure 4.
Both Loran and GPS have the long-term stability required to discipline (i.e. steer the frequency and phase into alignment with an external reference source) the ensembled clocks.
mm5_gps
· To assess the information content of the GPS slant path water vapor observations.
· To develop a strategy for assimilating the slant path water vapor data for mesoscale numerical weather prediction.
· A pre-frontal squall line formed over western Kansas-Oklahoma and moved across the NOAA ground-based GPS network.
Projection of ZWD from slant-path observation during the 24-h Period.
· We stratify the data into 6-h time intervals.
· In particular, we are interested in examining the difference between GPS and MM5 before, during, and after the squall line passage.
· SWV measurements have much larger dynamic range than PWV.
Therefore, it provides more information for assimilation.
gGPS http://www.colorado.edu/engineering/GPS/Papers/gGPS.pdf
We compare vertical rates of deformation de-rivedfromcontinuousGlobalPositioningSystem(GPS)ob- servations and episodic measurements of absolute gravity.
The GPSvertical deformation rates are signi cantly more precise than the gravity rates, primarily because of the denser temporal spacing provided by continuous GPS tracking.
Absolute gravity has been put forward as an e ective techniqueformeasuringverticaldeformationassociatedwith PGR [Lambert et al., 1989].
[BIFROST,1996]. Inthis paperwe compare continuousGPS observations withavailableabsolutegravityresultsfromcolocatedsites. WelookcriticallyatboththeGPSandabsolutegravitysys-tems. BasedondatacollectedatsitesinNorthAmerica,we evaluatewhichgeodetictechniqueisbettersuitedtostudy
We have made one correction to the time series shown in Figure 2.
Becauseofinstrumentanddeploymentcostsandthedi-cultyofeliminatingsystematicerrorsfromgravitymeasure- ments,we ndthatGPSisthebettersystemformonitoring PGR.Thiscomparisonalsosuggeststhatabsolutegravityis notase ectiveasGPSformeasuring verticaldeformation rates in tectonically active regions.
Argus, D. and M. Heflin, Plate motion and crustal deformation estimatedwithgeodeticdatafromtheGlobalPositioningSys-tem, Geophys.
Chris Verbil http://www.nena9-1-1.org/Wireless911/CIF Presentation PDFs/Chris Verbil.pdf
· 95% ALI-capable handset penetration of subscriber base by Dec. 31,
Takes advantage of key information from the wireless network to speed processing A network server assists the handset in determining location Software-based solution allows easy, cost-effective integration into handsets and carrier infrastructure.
At 5m to 50m accuracy, the Assisted-GPS solution answers "What Street Corner?"
At 300m accuracy, a TOA-based solution only answers "What part of Town?"
-- Verizon sells phones on website (December), no service launches to date.
Most US carriers not in compliance with E911 mandate -- AT&T launches GSM services without E-OTD in violation of their FCC waiver (no action by the FCC to date on this) (November).
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We thentestthis filter on simulateddata, andon some realdata.
Stability, on theother hand, isdefined as a measure ofconstancy--typicallyoverselec-tedsamplingperiods.
Thisnoiselevel allows one to measure at or beyondstate-of-the-art limitations imposed by the standard.
The advent of GPS has produced a significant step forward in the accuracies and stabilities with which time and frequency can be compared atremotesites.
More accurate time transfers wi 11 result as people take advantage of the two frequencies radiated from the GPS satellites --giving a real time calibration of the ionosphere.
The key questions, of course are regarding the availability of reasonably priced commercial receivers and continued access to the GPS constellation at full accuracy.
walta-gps_J_Wilkes http://www.phys.washington.edu/~walta/workshop_transparencies/walta-gps_J_Wilkes.pdf
If altitude is known, 3 satellites in view are sufficient.
If geographic location is known, 1 is sufficient.
Thereafter need only 1 satellite to track time.
Monitor station data processed at MCS to determine satellite orbits and to update each satellite's navigation message.
available to all users continuously, worldwide, free.
"paper" clock = all Monitor Station and satellite frequency standards.
· Low-impedance, fast rise-time 1PPS signals for "laboratory" applications.
· It provides several different power supply options to make use of your GPS receiver easier.
· It has provision for an Uninterruptable Power Supply (UPS) to buffer the GPS receiver through brief power outages.
PGettings
· Dixie Valley chosen as the initial geothermal field site.
· Gravity measurements taken at least twice on each station; local base occupied at least twice daily.
· GPS measurements taken for 30 minutes on each station.
· For Dixie Valley, production data have not yet been incorporated in the analysis.
· Repeated gravity & GPS measurements have been performed at Dixie Valley.
· Elevation differences are large, with very short wavelength changes; possibly a systematic processing error.
