Karsky, Dick. 2004. Comparing Four
Methods of Correcting GPS Data: DGPS, WAAS, L-BAND, and
2307. Missoula, MT: U.S. Department of Agriculture, Forest
Service, Missoula Technology and Development Center.
Describes four methods used to correct global positioning
system (GPS) data and compares their relative accuracies.
The correction methods include three that operate in
real time—differential GPS (DGPS), the wide area
augmentation system (WAAS), and satellite service providers
transmitting corrections on L-band frequencies—and
one that requires correcting the GPS data after it
has been collected (postprocessing). The best methods,
from the most to the least accurate, are: postprocessing
GPS data, using DGPS beacons to correct GPS data in
real time, using satellite service providers transmitting
corrections over L-band frequencies to correct GPS
data in real time, and using the wide area augmentation
system to correct GPS data in real time.
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