Sewall provides integrated geospatial, engineering, and forestry
consulting services to clients in government and industry. Our diverse
portfolio is based on 100 years' experience in surveying, forestry,
and engineering; 60 years’ in aerial mapping; and 20 years’ in GIS
and software application development. In the last 10 years, our
offerings have expanded to include web hosting services, software
as a service, and Sewall GeoPower™, a portal platform for
the collection, distribution, and resale of geospatial data.
Sewall photopilots have decades of experience in flight planning, aerial photography, and aerial survey quality control. Recognizing the time-sensitive nature of aerial photography projects, we respond quickly to unpredictable weather, narrow windows of opportunity, and tight project schedules. Sewall owns and maintains a fleet of twin-engine aircraft, precision-calibrated mapping cameras, and airborne GPS to aid in flightline navigation
Sewall provides comprehensive services in GIS development and maintenance to municipal, city, and county governments throughout the country. We assist our clients through every phase of a GIS project, from needs assessment and initial planning to system implementation and training. To address the critical issue of homeland security, we are prepared to build in data sets and applications for emergency planning, deployment, and response.
With production facilities in Old Town and Kentucky, Sewall is one of the largest photogrammetric mapping firms in the country. We produce accurate planimetric and topographic maps from aerial photography to meet the diverse needs of municipalities, state and federal governments, engineering firms, and utility companies.
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.