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Core
Technical Expertise
Surveying
and GPS
Sewall
offers a broad range of surveying services from high-order geodetic
surveys for photogrammetric map control to wetlands and utilities
location. To assist clients in such fields as municipal operations,
utilities management, forestry, and civil engineering, Sewall has
developed expertise in determining the accuracy required for diverse
applications and the most efficient methods of acquisition. Sewall
surveyors also perform standard boundary surveys, title surveys,
topographic surveys for engineering design and construction layout,
and hydrographic surveys of rivers and oceans.
ADVANCED
TECHNOLOGY
For the majority
of surveys, Sewall uses advanced Global Positioning System (GPS)
technology. Based on satellite ranging, GPS technology eliminates
the need for the standard traverse, saves time in the field, and
provides accurate information at less expense.
CONTROL
NETWORK
To establish
a solid foundation for municipal GIS, Sewall permanently monuments
photogrammetric control points, creating a town- or region-wide
geodetic network. Utilizing a geodetic-grade GPS system, Sewall
sets control quickly to support the production of highly accurate
digital planimetric and topographic mapping. When possible, Sewall
surveyors use available existing control information to minimize
costs. Once established, a control network has long-term utility
for surveyors, engineers, public works, and the community as a whole.
UTILITY
STRUCTURE AND WETLAND FLAG LOCATION
For utility
structure and wetland flag location, Sewall performs mapping-grade
surveys utilizing a handheld or backpack GPS system. This field-collected
data can be used to augment existing base maps or GIS databases
and is of particular value in utility, natural resource, and environmental
monitoring applications. Sewall also utilizes mapping-grade GPS
to acquire data for Emergency 911 implementation and for survey
reconnaissance.
AIRBORNE
GPS
In addition
to conventional GPS, Sewall uses airborne GPS technology to reduce
the amount of ground control required on aerial mapping projects
that cover large areas.
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