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3001 Inc. is an international spatial data corporation with
offices located across the United States. Its geospatial expertise
has been utilized in numerous projects throughout the Americas,
providing technological leadership and innovative solutions
to the engineering, surveying and geomatics community, with
a dedicated team of aerial survey, GIS and photogrammetry
professionals. Using leading-edge technology 3001 Inc. continues
to harness the power of geospatial information in an ever
changing world.
In December 2003, the company was tasked with providing a
series of high resolution color digital images of Collier
County in southwest Florida, as part of an on-going GIS update
program involving digital orthophotography, stereocompilation,
and planimetric mapping. Collier County is bordered on the
west by the Gulf of Mexico, and five other counties to the
north, east, and south. This portion of the project covered
approximately 800 square miles of varied terrain, including
large areas of swamp found along the coastal regions of western
Florida. The digital imagery would be used to generate digital
orthophotos and photogrammetric mapping data using stereoscopic
image coverage. The final orthorectified imagery and vector
mapping data would be input into the county's GIS system and
accessible through the Collier County Property Appraiser's
web site.
Digital Frame Camera Survey
"The POS AV system enabled us generate a
stable and complete aerotriangulation adjustment
in areas where it was most needed."
Greg Horrall
Aerial Triangulation Specialist 3001 Inc.
To meet the project's specific requirements, 3001 Inc. used
their Z/I Imaging DMC (Digital Mapping Camera) equipped with
an Applanix POS AV integrated inertial position and orientation
system, to capture the low-level imagery. The DMC digital
aerial camera system is designed for accurate, high-resolution
image acquisition for large mapping projects, where all cartographic
detail, such as vegetation, transportation networks, hydrography,
and buildings, can be clearly defined. It provides excellent
visibility in areas of shadow and generates a bright, sharp
image, ideal for this type of application.
Within two weeks the flying portion of the project was completed,
and image processing and data capture started. Flown at an
altitude of 4500', the color digital imagery generated a 0.45'
pixel size and a final delivery accuracy of 0.5' for the orthophotos.
The company found the POS AV system enabled them to attain
a tighter aerotriangulation result by utilizing its direct
georeferencing capability in areas where image tie point matching
was particularly difficult.
Greg Horrall explained. "There were areas along the
coast that were completely covered in swamp. Identifiable
ground features, such as small islands, were few and far between,
so we took advantage of the POS AV direct georeferencing capability.
By taking the exterior orientation parameters for the images
covering those areas, and using them as part of the aerotriangulation
adjustment, we were able to achieve a much more accurate result."
Using the POS AV-equipped DMC system, 3001 Inc. successfully
completed the Collier County project, and provided positionally-accurate
and highly-detailed digital imagery, ideally suited to the
orthophotography and data update requirements.
