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iG5 User Manual
Flat metal surfaces are bad. Corrugated metal surfaces (like
corrugated roofing) are even worse. Some mirrored glass
windowing used on building exteriors is reflective at
microwave frequencies. Box truck bodies, metal buildings,
metal roofs and open water are all potential sources of
multipath.
Deep Canyons
Locations at the bottom of deep canyons, especially East-
West trending canyons will present full, 100% obstruction
below the ridge line to the South. Most of the GPS satellites
are to the South. This is
BAD
.
RBUT (below) is a NGS CORS site, and is the closest CORS site
to the iGage office in Salt Lake City Utah. This site is hindered
by a solid mountain 30° mask to the South. This could be a
challenging location for GPS observations and is not a great
location for a CORS site.
Moving further North would gain elevation, effectively
lowering the southern mask.
