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Projects
SANTA
CLARA VALLEY TRANSPORTATION AUTHORITY - AERIAL MAPPING SERVICES
We currently have a one year contract
to provide as needed aerial photography, photogrammetric mapping, and digital
imagery services for the VTA. We have provided mapping and digital orthophotos
at a scale of 1"=40' from a photo scale of 1"=300' for various sites in
Santa Clara County. Final mylar plots incorporating the VTA titleblock
and AutoCad files were provided. We will also be providing digital orthophotos
at a scale of 1"=1000' for a major portion of Santa Clara County for a
transportation study.
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EBMUD
- PARDEE RESERVOIR MAPPING
Digital topographic maps at a scale
of 1"=100 with a 5' contour interval were produced from 1"= 600' photography.
The mapping area covered the Pardee Reservoir and a portion of the Mokelumne
River. The digital topographic maps will be used for engineering design.
A Microstation 3D file and final mylar plots were provided. We also calculated
area capacity curve volumes. Aerial photography and aerotriangulation for
provided for the western area of the Pardee Reservoir project.
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STANFORD
UNIVERSITY - JASPER RIDGE BIOLOGICAL PRESERVE
GeoCadd Surveys provided color and infrared
aerial photography for approximately 1400 acres which covered the Jasper
Ridge Biological Preserve. GPS was used to establish twelve permanent monuments
for the production of digital orthophotos and future mapping. The photography
was flown at a scale of 1"=800' with 60% overlap between exposures. A DTM
was photogrammetrically digitized and used to produce a final color orthophoto
at a scale of 1"=300 and 1"=100' Color contact prints and color diapositives
were also produced.
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EAST
BAY REGIONAL PARK DISTRICT
Provided digital photogrammetric mapping
for the Oro Loma Marsh Enhancement and Big Break Trail project. Photography
was flown at a scale of 1"=300 to produce 1"=40 digital maps with a 1
contour interval covering approximately 800 acres. Final plots were produced
incorporating the EBRPD titleblock and CADD standards. A rectified aerial
enlargement and digital orthophotos of the site were also provided. A world
transformation file was provided for correct orientation and scaling of
the image for use with the GIS ( ArcCAD, ARC/INFO ) and CADD software.
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STANDFORD
UNIVERSITY - AERIAL MAPPING FOR DRAINAGE STUDY
Photography was flown at a scale of
1"=300 to produce 1"=40 digital maps with a 1 contour interval for design
engineering. Photography covers approximately two-thirds of the campus.
Digital orthophotos at a scale of 1"=40 with a .25 foot pixel size will
also be generated in the future.
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HEWLETT
PACKARD - SANTA ROSA GIS FACILITIES MAPPING
For this project digital planimetric
and topographic mapping was produced from 1"=300 and 1"=600 photography.
Three sites were mapped and digital orthophotography was produced for each
site. A world transformation file was provided for correct orientation
and scaling of the image for use with the GIS (ArcCAD,ARC/INFO) and CADD
software. Final halftone mylars were produced from the final digital orthophotos
and CADD files.
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AERIAL
MAPPING SERVICES AND ORTHOPHOTOGRAPHY - MARIN MUNICIPAL WATER DISTRICT
This project involved providing aerial
photo coverage of approximately 2,202 acres, from the intersection of U.S.
101 and Lucas Valley Road to the intersection of U. S. 101 and Main Gate
of Hamilton Air Force Base. Topographic maps and orthophoto contour maps
were produced for 730 acres of the site. Aerial photography was flown at
1"=1000' for development of 1"=100' scale 5' contour interval maps. Marin
Municipal Water District (MMWD) was provided an AutoCad DWG file and final
mylars incorporating the MMWD titleblock.
Under the supervision of Sandra Williamson,
aerial panels were laid out for photogrammetric ground control. GPS surveying
techniques were used to control costs and provide Third Order Accuracy.
This project was completed ahead
of schedule and within the budget.
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DEATH
VALLEY NATIONAL MONUMENT - GRAPEVINE AREA, CALIFORNIA
This project involved producing 1"=10'
scale 1' contour interval maps from 1"=200' photography. We supplied both
hardcopy and digital data. This project required strict adherence to National
Park Service cartographic standards. Three dimensional files were produced
for use with the Park Service's design software. Additional CADD editing
was required to input field survey data. Field survey's confirmed the accuracy
of the map data. The National Park Service was very pleased with the results.
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FEMA
- FLO0D INSURANCE STUDY
The area to be digitized was located
in Santa Clara County, Ca. Cross-sections and sheet flow data was digitized
according to FEMA specifications from 1"=1000' photography. Aerotriangulation
methods were used to gain additional control necessary to set up 14 models.
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UNION
SANTIARY DISTRICT
Geocadd Surveys provided rectified aerial
photography at a scale of 1"=250. The ground pixel resolution was .25
ft. The final imagery was provided in a TIFF File format with a ESRI worldfile.
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AERIAL
MAPPING SERVICES FOR ACTIVE LANDFILLS - IWMD, COUNTY OF ORANGE, CALIFORNIA
For this project GeoCadd Surveys provided
detailed mapping services for the four active landfills that serve the
waste refuse and reclamation needs of the communities within the County
of Orange in Southern California. Final mapping scale of 1"=100 with a
2 contour interval. The projects required the files be delivered in a
three dimensional file containing the information in Softdesk "DCA" point
format. This formatting allowed IWMD to process the earthwork calculations
for site volumes.
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SAN
JOSE STATE UNIVERSITY - GIS MAPPING
For this project GIS digital planimetric
and topographic data was produced from 1"=250' photography resulting in
a final map scale of 1"=40' with a one foot contour interval. Analytical
aerotriangulation was used to produce additional horizontal and vertical
control. Utility and other planimetric features were directly digitized
from the stereo plotters into a digital database. The digital data was
delivered in a three dimensional AutoCad file. CADD standards were incorporated
with appropriate symbology and layers. Aerial enlargements of the campus
site were also produced.
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VACAVILLE
PIPELINE STRIP MAPPING - VACAVILLE, CALIFORNIA
Approximately four miles of digital
mapping was provided for the design of a sewer and water pipeline. Aerial
photography was flown at a scale of 1"=300 to produce final maps at a
scale of 1"=40 with a one foot contour interval. Softdesk "points" were
provided for future TIN generation. The final file was three dimensional
AutoCad DWG file.
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MORRO
BAY STATE PARK
Digital topographic maps at a scale
of 1"=20" with a 1' contour interval were produced from 1"= 250' photography.
An Autocad 3D file was provided incorporating the State Park Districts
CADD standards. Supplemental survey data was obtained for areas obscured
by vegetation and shadows.
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LOS
POSITAS COLLEGE - LIVERMORE, CALIFORNIA
Digital topographic mapping was provided
at a scale of 1"=40' with a 2' contour interval from 1"= 500' photography.
A three dimensional Autocad dwg file was provided and an aerial enlargement
of the site.
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CITY
OF PETALUMA - OXIDATION PONDS & DIGITAL ORTHOPHOTOS
GeoCadd Surveys provided digital photogrammetric
mapping at a scale of 1"=40 with a 1 foot contour interval . Digital orthophotos
were produced at a scale of 1"=100 with a pixel resolution of .5 feet
yielding a high resolution image. Halftone mylars of the digital orthophotos
were plotted using an Imagesetter. Final digital map file was an AutoCad
DWG file.
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UNOCAL
COLOR RECTIFIED DIGITAL IMAGERY
Forty-two color enlargements were produced
from 1:22,000 and 1:33,000 scale photography . The photography was scanned
and digitally rectified .The UNOCAL refinery boundary, roads, and tanks
were digitally added to the image. The final color enlargements were 65"x
37" at a scale of 1"=200 and an oblique view of the site was also produced.
A georeferenced TIFF file was supplied with an AutoCad file containing
the boundary, road names, and tank names on CD-ROM.
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PALO
ALTO ROAD WIDENING
Digital topographic maps at a scale
of 1"=40' with a 2' contour interval were produced from 1"= 300' photography.
The project involved mapping the Interstate 280 and Page Mill Road interchange
and approiximately 3 miles of Interstate 280.
An Autocad 3D file was provided with
Softdesk compatible point data. Final vellum plots were also produced.
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CITY
OF BURLINGAME - DISPOSAL SITE TOPOGRAPHY
Digital topographic map at a scale of
1"=100' with a 1' contour interval was produced from 1"=325' photography.
A three dimensional Autocad dwg file, final mylars and an aerial enlargement
of the site was supplied.
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CASMALIA
RESOURCES LANDFILL SITE - EPA
This project involved producing topographic
maps at a scale of 1"=100 with a 2 foot contour interval from aerial photography
taken at approximately 3600 feet above mean terrain. Orthophoto and ortho\topo
composite maps were produced at a scale of 1"=100'. An Autocad 3D file
was also supplied.
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HAWTHORNE
ARMY AMMUNITION PLANT - HAWTHORNE, NEVADA
GeoCadd Surveys provided aerial photography
for approximately 230 square miles which covered the entire Hawthorne Army
Ammunition Plant. Thirty- three flight lines and 1000 exposures were produced
to provide coverage of the entire Hawthorne Army Ammunition Plant boundary.
The photography was flown at a scale of 1"=600' with 60% overlap between
exposures for future digital photogrammetric mapping and a GIS database.
Contact prints and aerial enlargements were developed incorporating U.S.
Corp of Engineer specifications.
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LAKE
NORDEN ENVIRONMENTAL STUDY - GIS MAPPING & DIGITAL IMAGERY
A final rectified digital aerial photo
was provided and a basemap with photo background plots. The final digital
image was rectified to the exisiting basemap and a final image was produced
by a mosaic of two photos. Additional planimetric features were then digitized
and incorporated into the final basemap. Final plots detailed sampling
points of the toxic spill along with the image background.
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GIS
DIGITAL MAPPING - SEASIDE, CALIFORNIA
While an employee of Nolte & Associates,
Sandra Williamson produced a GIS digital aerial topographic and utility
system map for the entire City of Seaside, California. This data was prepared
in AutoCad format as well as the City's specialized AMSA format.
GPS surveying techniques along with
conventional methods were used to provide a network of 50 GPS control point
monuments for the City. This network was set up to provide a control base
for not only the GIS digital AutoCad database but for the City to have
recorded and monumented positions for future surveying and construction
needs.
Black and white and color aerial
photography was flown at two scales; 1"=555' for the preparation of orthophoto
sheets at 1"=100' and 1"=300' to be used for the 1"=40' GIS database maps.
The ortho sheets can be converted at a later time into the City's GIS system
as a digital ortho image. A digital orthophoto was generated for a pilot
area.
Advanced analytical measuring and
computational techniques were used to aerial triangulate and bridge the
additional horizontal and vertical control needed to set up the three dimensional
stereo models within the stereo plotters.
The data was digitized to accommodate
the City defined layering, symbolization and line fonts. Quality control
was maintained with close communication to the City as well as the use
of existing utility maps. When needed for quality assurance, field editing
was done with the field information added into the database.
The utility systems digitized for
the AutoCad GIS consisted of:
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824 sanitary sewer manholes
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450 catch basins
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790 water meters
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400 fire hydrants
-
231 storm drain manholes
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50 water valves
-
464 rod holes
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Digital
Photogrammetry