GPS Error
<<Thanks for the info. Wish I could believe your figures, but having spent a
field season with a Trimble Scout and occassionally with two other geologists
with a Garmin (don't know the model) and a Magellan Meridian I find that the
system tends to typically produce readings that vary more like 50-200 m. Such
variations can be within an hour or two or several days apart. By this I mean
taking a reading and at the same spot taking a reading an hour later or days
later and having the two readings differ by that much in lat and/or long.>>
Lanny, I think what you are seeing here is more an effect of your use of
"budget" receivers, rather than the "design accuracies" built into the control
and space segment elements of the system. A Trimble 4000 series receiver or
equivalent would not show this level of drift.
Not surprised at the level of multipath effects seen in canyons… you'd be
better off with more conventional survey tools in those locations.
Rob