A significant portion of WSI's past experience includes city-county projects that have required large-scale digital planimetric-topographic mapping and/or high-resolution digital orthophotos. A sampling of such projects are as follows:
- U.S. Navy --- Photogrammetric Mapping Services (Over 50 Navy installations)
- Texas Tech University --- Photogrammetric Services (4,240 Acres)
- CRMWA Series 30 Wells --- Photogrammetric Mapping (42.4 sq. mi.)
- TxDOT, Interstate 10 and Spur 330 --- Photogrammetric Mapping (2.5 linear mi.)
- City of Abilene, TX --- Citywide Mapping and Orthophotos (975 sq. mi.)
- City of Pearland, TX --- Citywide Digital Mapping and Orthophotos (83 sq. mi.)
- City of Burleson, TX --- Citywide Digital Mapping and Orthophotos (67 sq. mi.)
- City of Killeen, TX --- Citywide Digital Mapping and Orthophotos (88 sq. mi.)
- City of Del Rio, TX --- Citywide Digital Mapping and Orthophotos (54 sq. mi.)
- City of Nacogdoches, TX --- Citywide Digital Mapping and Orthophotos (51 sq. mi.)
- City of Copperas Cove, TX --- Citywide Digital Mapping and Orthophotos (86 sq. mi.)
- City of Kerrville, TX --- Citywide Digital Mapping and Orthophotos (94 sq. mi)
- City of College Station, TX --- Citywide Digital Mapping (61 sq. mi.)
- City of Amarillo, TX --- Citywide Digital Mapping (176 sq. mi.)
- City of Temple, TX --- Citywide Digital Mapping (130 sq. mi.)
- City of Belton, TX --- Citywide Digital Mapping and Orthophotos (30 sq. mi.)
- City of DeSoto, TX --- Citywide Digital Mapping (22 sq. mi.)
- City of Gatesville, TX --- Citywide Digital Mapping and Orthophotos (12 sq. mi.)
- City of White Settlement, TX --- Citywide Digital Mapping and Orthophotos (6 sq. mi.)
- City of Canyon, TX --- Citywide Digital Mapping (10 sq. mi.)
- City of Levelland, TX --- Citywide Digital Mapping and Orthophotos (21 sq. mi.)
- City of Portland, TX --- Citywide Digital Mapping (9 sq. mi.)
- City of Harker Heights, TX --- Citywide Digital Mapping (11 sq. mi.)
- City of Sinton, TX --- Citywide Digital Mapping (5 sq. mi.)
- Franklin County, OH --- Countywide Digital Mapping and Orthophotos (540 sq. mi.)
- Pickaway County, OH --- Countywide Orthophotos (502 sq. mi.)
- Tunica County, MS --- Countywide Digital Mapping and Orthophotos (460 sq. mi.)
- Harrison County, MS --- Countywide Digital Mapping and Orthophotos (563 sq. mi.)
- Madison County, MS --- Countywide Orthophotos (719 sq. mi.)
- Neshoba County, MS --- Countywide Orthophotos (570 sq. mi.)
- Winston County, MS --- Countywide Orthophotos (607 sq. mi.)
- Lafayette County, MS --- Countywide Orthophotos (631 sq. mi.)
- Lee County, MS --- Countywide Orthophotos (450 sq. mi.)
- City of Mobile, AL --- Citywide Digital Mapping and Orthophotos (256 sq. mi.)
- Mobile County, AL --- Countywide Orthophotos (1238 sq. mi.)
- Pickens County, GA --- Countywide Orthophotos (232 sq. mi.)
- Leavenworth County, KS --- Countywide Orthophotos (463 sq. mi.)
- City of Lansing, KS --- Citywide Digital Mapping (6 sq. mi)
WSI also has an abundance of TxDOT experience, having performed large-scale digital mapping and
digital orthophoto projects for a number of district offices through several engineering-surveying
contractors. A sampling of these are as follows:
- Interstate 10 and Spur 330; Harris County, TX --- Performed for TxDOT's Houston District as a contractor to Baseline Corporation (2.5 miles)
- Interstate 20; Ector and Midland Counties, TX --- Performed for TxDOT's Odessa District as a contractor to MK Centennial (47 miles)
- U.S. Highway 83; Taylor County, TX --- Performed for TxDOT's Abilene District as a contractor to Sheppard Surveying, Inc. (11.6 miles)
- State Highway 188; San Patricio and Aransas Counties, TX --- Performed for TxDOT's Corpus Christi District as a contractor to Naismith Engineering, Inc. (41 miles)
- FM 2154, FM 2347, and FM 2818; Brazos County, TX --- Performed for TxDOT's Bryan District as a contractor to Landtech Consultants, Inc. (intersection mapping)
- FM 1365 and Burlington Northern Railroad; Teague, TX --- Performed for TxDOT's Bryan District as a contractor to Landtech Consultants, Inc. (intersection mapping)
- State Highway 19; Huntsville, TX --- Performed for TxDOT's Bryan District as a contractor to Landtech Consultants, Inc. (7 miles)
- Loop 12; Dallas, TX --- Performed for TxDOT's Dallas District as a contractor to NTB Associates (1.85 miles)
- New Braunfels Municipal Airport; New Braunfels, TX --- Performed for TxDOT's Aviation Division as a contractor to Parkhill, Smith & Cooper, Inc. (1020 acres)
- Highway 87 Reliever Route; Lamesa, TX --- Performed for TxDOT's Lubbock District as a contractor to High Tech Land and GPS Surveyors, Inc. (15 miles)
- State Highway 46; Bulverde, TX --- Performed for TxDOT's San Antonio District as a contractor to MDS Land Survey Company, Inc. (3 miles)
Additional information including references for selected projects, is provided on the pages that follow.
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| Client: |
U.S. Department of the Navy
Southern Division Naval Facilities Engineering Command
2155 Eagle Drive
North Charleston, South Carolina 29417
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| Contact: |
Brian VanBockern
843-820-7084
vanbockernB@EFDSOUTH.NAVFAC.NAVY.mil
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| Duration: |
December, 1996 to September, 2004 |
| Project Size: |
Over 50 separate Navy installations of various sizes located in the following
states: Alabama, Arkansas, California, Florida, Georgia, Illinois, Louisiana,
Maryland, Mississippi, New York, North Carolina, Rhode Island, Tennessee,
Texas, and Virginia
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| Description: |
As part of multiple work orders over an eight year period, WSI provided photogrammetric mapping services to the U.S. Navy through six of its engineering contractors: The Onyx
Group, Inc., of Alexandria, Virginia; Dames & Moore, Inc. of Phoenix, Arizona; Huitt-Zollars, Inc. of Fort Worth, Texas; Bessent, Hammack & Ruckman, Inc. of Jacksonville,
Florida; Obsidian Group, Inc. of Jacksonville, Florida; and The Environmental Company, Inc. of Charlottesville, Virginia.
This involved over 50 U.S. Navy installations located in 15 states and included both black-and-white and color aerial photography, airborne GPS, GPS ground control surveys,
analytical aerial triangulation, digital topographic mapping, image scanning, and digital orthophotography. Most of the mapping was compiled with a 1-foot contour interval and
consisted of 29 separate data layers. Deliveries were made in MicroStation, AutoCAD, and ArcInfo formats and all conformed to the Tri-Services Spatial Data Standards.
A portion of these installations are as follows:
- NAS - Corpus Christi, TX
- NAS - Kingsville, TX
- NAS - Meridian, MS
- NAS - Pensacola, FL
- NAS - Jacksonville, FL
- NAS - Key West, FL
- NAS - Whiting Field, FL
- NAS - Millington, TN
- NAS - JRB Fort Worth, TX
- NAS - JRB New Orleans, LA
- NTC - Great Lakes, IL
- NETC - Newport, RI
- FCTCPAC - San Diego, CA
- FCTCLANT - Damneck, VA
- Naval Support Unit - Saratoga Springs, NY
- NAVSCSCOL - Athens, GA
- USNA - Annapolis, MD
- MCB - Camp Lejeune, NC
The following e-mail relates to a recently completed project performed by WSI for the U.S. Navy at MCB (Marine Corps Base) Camp Lejeune, North Carolina.
The project was completed in August, 2004 while WSI was still operating under the Sanborn Map Company name. It consisted of more than 850 aerial photographs from which color digital orthophotos that were
produced with 0.3 and 0.15 meter pixel resolutions.
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| Client: |
Franklin County Auditor
373 South High Street
Columbus, Ohio 43215
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| Contact: |
Fred Buttle, Deputy Auditor/Municipal Coordinator
614-462-7291
fgbuttle@co.franklin.oh.us
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| Duration: |
March, 1995 to April, 1997
February, 1996 to April, 1998
February, 2000 to December, 2002
March, 2004 to April, 2005
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| Project Size: |
543 Square Miles
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| Description: |
WSI was awarded four contracts over a nine-year period for countywide GIS map updates and digital orthophotos. These contracts have included both black-and-white
and color aerial photography at scales ranging from 1"=400' to 1"=800', airborne GPS, GPS ground control surveys, analytical aerial triangulation, digital topographic map updating
(1"=100', 2' contour interval, MetaMAP delivery format), image scanning, and both black-and-white and color digital orthophotos.
The County's GIS map base consists of 2550 map tiles (2500' x 2500') and 36 levels of data. WSI has successfully completed two countywide update cycles, which were accomplished
with Zeiss Planicomp first-order analytical stereoplotters equipped with superimposition.
Since this is a growing county with a population of over one million, the changes and update requirements are significant and have included every one of the 2550 map tiles. An
additional challenge involved translating the data out of and back into the County's MetaMAP GIS format while maintaining the integrity of the attribute data.
Each contract has also included the preparation and delivery of digital orthophotos in a geo-referenced, uncompressed TIF format. Until the most recent contract, these were delivered
in black-and-white with a 6" pixel resolution. For the most recent project, WSI delivered color digital orthophotos with a 3" pixel resolution. Each of the 2550 image files were
300 megabytes in size.
In connection with these projects, WSI also received contracts for add-on work from the Cities of Columbus and Westerville.
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| Client: |
City of Abilene
555 Walnut Street
Abilene, Texas 79601
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| Contact: |
Greg Brown, GIS Manager
325-676-6415
greg.brown@abilenetx.com
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| Duration: |
December, 2001 to September, 2002
January, 2005 to April, 2006
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| Project Size: |
975 Square Miles
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| Description: |
WSI was awarded two contracts over a three year period.
The first contract was to provide black-and-white digital orthophotography (2' pixel resolution) covering all of Taylor County and portions of Jones and Callahan Counties
(approximately 975 square miles). Services included black-and-white aerial photography (1"=2000'), airborne GPS, GPS control surveys, image scanning, analytical aerial
triangulation, DEM collection, and black-and-white ortho-rectification.
The imagery was mosaiced and tone balanced for providing a seamless appearance and was then cut into 221 12,000' x 12,000' tiles. Deliveries were made in an uncompressed, geo-
referenced TIF format with each file being 36 megabytes in size.
The second contract was to provide color digital orthophotography (6" and 1' pixel resolutions) and digital topographic mapping (1"=100' and 1"=200', 2' and 4' contour
intervals, ArcView delivery format) of the area within Abilene's city limits and most of its Extra Territorial Jurisdiction (approximately 398 square miles). Services included color aerial
photography (1"=625' and 1"=1250'), airborne GPS, GPS control surveys, concrete monumentation at 8 locations, analytical aerial triangulation, and image scanning as well as
the digital mapping and digital orthophoto production.
The 1"=100' scale area, which required 2' contours and 6" pixel orthophotos, consisted of 380 3000' x 3000' map tiles. The 1"=200' scale areas, which required 4' contours and 1'
pixel orthophotos, consisted of 211 6000' x 6000' tiles.
Each of the color digital orthophotos were delivered in an uncompressed, geo-referenced TIF format and were 108 megabytes in size.
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| Client: |
Harrison County Board of Supervisors
1801 23rd Avenue
Gulfport, Mississippi 39501
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| Contact: |
Sue Shipman
228-865-4250
hcdata@co.harrison.ms.us
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| Duration: |
January, 2001 to October, 2002
January, 2003 to November, 2003
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| Project Size: |
563 Square Miles
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| Description: |
WSI was awarded two contracts over a three year period for countywide GIS map updates and color digital orthophotography. These contracts included color aerial photography at three scales (1"=500', 1"=800', 1"=2000'), airborne GPS, GPS ground control surveys, analytical aerial triangulation, digital topographic map updating (1"=100' with a 2' contour interval and 1"=400' with a 5' contour interval, AutoCAD delivery format), image scanning, and color digital orthophotos.
The map updates consisted of 443 quarter-section tiles at a scale of 1"=100' and 113 four-section tiles at a scale of 1"=400'. This was accomplished with Zeiss Planicomp first-order analytical stereoplotters equipped with superimposition. In addition to the AutoCAD files, deliveries also included one set of 32" x 32" paper check plots.
Color digital orthophotos were produced with 6" and 2' pixel resolutions using a Leica DSW300 precision photogrammetric scanner and both Leica and Boeing Autometric softcopy workstations for ortho-rectification. These were delivered in an uncompressed, geo-referenced TIF format as two sets --- one set was prepared with overlap to match the County's existing map tiles which correspond to section lines and a second set was prepared without overlap so that the image files could be easily merged and used in a seamless manner.
The County was also delivered one set of overlapping 9" x 9" color contact prints.
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| Client: |
Lee County Tax Assessor
County Courthouse
P.O. Box 1785
Tupelo, Mississippi 38802
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| Contact: |
Mark Weathers, Tax Assessor
662-841-9030
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| Duration: |
January, 2004 to January, 2005
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| Project Size: |
450 Square Miles
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| Description: |
WSI was contracted to provide countywide color digital orthophotos at 6" and 1' pixel resolutions. The 6" resolution imagery was produced for the City of Tupelo and environs (approximately 81 square miles) and the 1' resolution imagery was produced for the balance of the County.
Services included color aerial photography at two scales (1"=625' and 1"=1250'), airborne GPS, GPS control surveys, analytical aerial triangulation, DEM collection, and color digital orthophotos.
The aerial photography was acquired utilizing a Leica RC-30 precision mapping camera and consisted of approximately 800 exposures at the two flight scales.
The photography was scanned with a Leica DSW300 precision photogrammetric scanner, and the DEM collection and ortho-rectifications were performed with Leica and Boeing Autometric softcopy workstations.
The imagery was mosaiced and color balanced for providing a seamless appearance and was then cut into 252 3000' x 3000' tiles (6" pixel resolution) and 342 6000' x 6000' tiles (1' pixel resolution). Deliveries were made in an uncompressed, geo-referenced TIF format with each file being 108 megabytes in size.
Delivery also included one set of overlapping 9" x 9" color contact prints.
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| Client: |
Tunica County, Mississippi
1058 S. Court Street, P.O. Box 639
Tunica, Mississippi 38676
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| Contact: |
Rodney Gilchrist, GIS Director
601-363-1465
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| Duration: |
March, 1998 to June, 1999
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| Project Size: |
460 Square Miles
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| Description: |
WSI was contracted to provide countywide photogrammetric mapping and related services. This included black-and-white aerial photography, GPS control surveys, analytical aerial triangulation, DTM collection, contour generation, digital orthophotography, and property ownership mapping.
Black-and-white aerial photography was obtained at two scales: 1"=800' for producing digital orthophotos at 1"=100', and 1"=2000' for producing digital orthophotos at 1"=400' and for DTM collection and generation of a 5' contour interval. This was accomplished using a Leica RC-30 precision mapping camera and consisted of more than 830 exposures.
Horizontal and vertical control was established using GPS at 98 locations, which included 20 pair of concrete monuments. The control data was then expanded using fully-analytical aerial triangulaton procedures with Zeiss PAT-M software.
DTMs and a 5' contour interval were compiled for the entire County using Zeiss first-order analytical stereoplotters. Delivery included one set of 140 paper check plots at 1"=400' and one set of digital files in AutoCAD format.
Digital orthophotos were also compiled of the entire County and consisted of 140 sheets at 1"=400' with a 2' pixel resolution and 280 sheets at 1"=100' with a 6" pixel resolution. This was accomplished with a Leica DSW300 precision photogrammetric scanner and a Boeing Autometric IPS Softplotter. Delivery included one set of 420 paper check plots and one set of uncompressed, geo-referenced TIF files. An image catalog was also prepared and delivered.
Property ownership and zoning maps were also prepared and delivered in AutoCAD format. This was accomplished using the services of Tri-State Consulting Services, Inc.
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| Client: |
City of Killeen
101 North College Street
Killeen, Texas 76540
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| Contact: |
Thomas Dann, Director of Planning
254-501-7630
tdann@ci.killeen.tx.us
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| Duration: |
February, 1994 to March, 1995
February, 2001 to May, 2001
September, 2001 to November, 2002
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| Project Size: |
88 Square Miles
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| Description: |
WSI was awarded three contracts over a period of eight years to provide photogrammetric services for the area within the Killeen city limits and its Extra Territorial Jurisdiction. The services included black-and-white aerial photography at two scales (1"=800' and 1"=1000'), GPS control surveys, concrete monumentation at 10 locations, analytical aerial triangulation, digital topographic mapping (1"=200', 2' contour interval, AutoCAD and ArcInfo delivery formats), and black-and-white digital orthophotos.
Map data was initially compiled in 1994 and consisted of 63 4000' x 6000' tiles. This was accomplished with Zeiss Planicomp first-order analytical stereoplotters and consisted of contours and limited planimetric detail delivered in AutoCAD release 12 format. Scale-rectified, screened film positive photo enlargements (24" x 36") were also prepared to accompany each map tile.
In 2001 WSI was contracted to photogrammetrically update and expand this data to include 102 4000' x 6000' tiles. As part of this process the data was made GIS compatible and was delivered in an ArcInfo format as well as AutoCAD.
The 2001 contract also included the delivery of black-and-white digital orthophotos, which were prepared by scanning the aerial negatives with a Leica DSW300 precision photogrammetric scanner and then ortho-rectifying the images to photogrammetrically-collected DEM data. The ortho-rectification process was accomplished with both Leica and Boeing Autometric softcopy workstations.
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| Client: |
City of Kerrville
800 Junction Highway
Kerrville, Texas 78028
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| Contact: |
Paul Menzies, GIS Project Manager
830-792-8351
paulm@kerrville.org
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| Duration: |
January, 2003 to September, 2003
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| Project Size: |
94 Square Miles
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| Description: |
WSI was contracted to provide photogrammetric services for all area within the Kerrville city limits and its two-mile Extra Territorial Jurisdiction. These services included color aerial photography at two scales (1"=833' and 1"=1667'), airborne GPS, GPS control surveys, concrete monumentation, analytical aerial triangulation, digital topographic mapping (1"=200', 4' contour interval, ArcView, MicroStation SE and AutoCAD 2000 delivery formats), and color digital orthophotos.
The color aerial photography was acquired with a Leica RC-30 precision camera and consisted of more than 300 overlapping exposures.
The digital topographic mapping was compiled using Zeiss first-order analytical stereoplotters and consisted of multiple data layers which were delivered in a GIS compatible format (closed polygons, no dangling nodes, attributed contours, etc.) based on a 2000' x 3000' tile layout.
The color digital orthophotos were produced with a 1' pixel resolution to correspond to each of the map tiles. This was accomplished using a Leica DSW300 precision photogrammetric scanner and both Leica and Boeing Autometric softcopy workstations. Each image was mosaiced and color balanced for the purpose of providing seamless coverage, and deliveries were made in an uncompressed, geo-referenced TIF format.
The color images were also delivered in MrSID and ER Mapper ECW compression formats.
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| Client: |
City of Copperas Cove
507 South Main Street
Copperas Cove, Texas 76522
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| Contact: |
Paul Boyer, City Engineer
254-547-4221
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| Duration: |
January, 2003 to June, 2003
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| Project Size: |
86 Square Miles
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| Description: |
WSI was contracted to provide photogrammetric services for all area with the Copperas Cove city limits and its Extra Territorial Jurisdiction. These services included color aerial photography at 1"=833' scale, airborne GPS, GPS control surveys, aerial triangulation, digital topographic mapping (1"=100' and 1"=200', 2' contour interval, AutoCAD delivery format), and color digital orthophotos.
The aerial photography was acquired with a Leica RC-30 precision camera and consisted of approximately 180 overlapping exposures.
The digital topographic mapping was compiled using Zeiss first-order analytical stereoplotters and was done to GIS standards that will allow for a later translation to ArcInfo. In addition to the AutoCAD files, one set of 24" x 36" mylar map plots were also delivered.
The color digital orthophotos were produced with a 1' pixel resolution to correspond to each of the map tiles. This was accomplished using a Leica DSW300 precision photogrammetric scanner and both Leica and Boeing Autometric softcopy workstations. Each image was mosaiced and color balanced for the purpose of providing seamless coverage, and deliveries were made in an uncompressed, geo-referenced TIF format.
Deliveries also included one set of 9" x 9" color contact prints and five 40" x 60" color plots from a digital orthophoto mosaic covering the entire project area.
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| Client: |
City of Del Rio
114 W. Martin Street
Del Rio, Texas 78840
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| Contact: |
Ruben Guerrero, GIS Administrator
830-774-8613
ruben@cityofdelrio.net
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| Duration: |
December, 1997 to December, 1998
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| Project Size: |
54 Square Miles
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| Description: |
WSI was contracted to provide photogrammetric services for the area within the Del Rio city limits and its Extra Territorial Jurisdiction. These services included black-and-white aerial photography at three scales (1"=500', 1"=700', and 1"=1000'), GPS ground control surveys, concrete monumentation at 20 locations, analytical aerial triangulation, digital topographic mapping (1"=100' and 1"=200', 2' contour interval, ArcInfo and MicroStation delivery formats), and black-and-white digital orthophotos.
The digital map compilation was accomplished with Zeiss Planicomp first-order analytical stereoplotters and consisted of 151 3000' x 3000' tiles at 1"=100' scale and 19 6000' x 6000' tiles at 1"=200' scale. In addition to the ArcInfo and MircoStation files, the City was also provided one set of 36" x 36" mylar plots.
The black-and-white digital orthophotos were prepared using a Leica DSW300 precision photogrammetric scanner and a Boeing Autometric softcopy workstation. These images corresponded to each map tile and were delivered in an uncompressed, geo-referenced TIF format. Each of the 170 files were 36 megabytes in size.
In addition to the original work order, WSI was contracted to fly additional aerial photography in October, 1998 immediately after the City was ravaged by flooding along the Rio Grande. This photography, as well as the various digital mapping products, was used extensively by FEMA in the flood's aftermath.
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| Client: |
Texas Tech University
171 Administration Building
P.O. Box 42004
Lubbock, Texas 79409-2004
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| Contact: |
Arthur N. Glick, Executive Associate
806-742-1310
arthur.glick@ttu.edu
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| Duration: |
March, 2001 to August, 2002
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| Project Size: |
4,240 Acres
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| Description: |
WSI was contracted to provide photogrammetric services at six Texas Tech properties --- the Main Campus in Lubbock, TX (2300 acres), the East Research Center in Lubbock, TX (105 acres), the Lubbock Lake property in Lubbock, TX (340 acres), the New Deal Farm property near New Deal, TX (960 acres), the Junction, TX property (470 acres), and the proposed Hill Country Campus in Fredericksburg, TX (65 acres).
Services included low-altitude color aerial photography (1"=330'), analytical aerial triangulation, digital topographic mapping (1"=50', 1' contour interval, AutoCAD delivery format), image scanning, and color digital orthophotos (3" pixel resolution). Horizontal and vertical ground control was established by the University's survey contractor, High Tech Land and GPS Surveyors, Inc. of Lubbock, TX.
The digital topographic mapping was compiled for the Main Campus and East Research Center using Zeiss Planicomp first-order analytical stereoplotters. It was collected in multiple planimetric layers and included detail as fine as manholes, utility poles, hydrants, bicycle racks, and parking lot stripes. In addition to the AutoCAD files, deliveries also included 93 24" x 36" mylar map plots at 1"=50' scale.
High-resolution color digital orthophotos were also delivered for each of the 93 map sheets at the two locations. This was accomplished using a Leica DSW300 precision scanner and both Leica and Boeing Autometric softcopy workstations for ortho-rectification. Each image was mosaiced and color balanced for the purpose of providing seamless coverage, and deliveries were made in an uncompressed, geo-referenced TIF format.
Although not orthophotos, various color photographic products were also provided for the other four sites.
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| Client: |
Parkhill, Smith, Cooper, Inc.
4222 85th Street
Lubbock, Texas 79423
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| Contact: |
John T. Hamilton, P.E.
806-473-2200
jhamilton@TEAM-PSC.com
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| Duration: |
October, 2004 to February, 2005
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| Project Size: |
42.4 Square Miles
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| Description: |
As part of a well project for the Canadian River Municipal Water Authority, WSI was contracted to provide photogrammetric mapping of a remote, relatively hilly area located in in Hutchinson and Roberts Counties, TX near the City of Pampa.
Services included black-and-white aerial photography (1"=625'), airborne GPS, analytical aerial triangulation, digital topographic mapping (1"=100', 2' contour interval, AutoCAD delivery format), and black-and-white digital orthophotos with a 6" pixel resolution. Horizontal and vertical ground control was established at approximately 42 locations by PSC's survey contractor, High-Tech Land and GPS Surveyors, Inc. of Lubbock, TX.
The aerial photography was acquired using a Leica RC-30 precision camera and the map data was collected with Zeiss Planicomp first-order analytical stereoplotters. The contours were generated using a DTM collection method and planimetric features were compiled in multiple data layers. The mapping consisted of 96 2000' x 300' tiles.
Black-and-white digital orthophotos were also produced for each of the 96 tiles. This was accomplished using a Leica DSW300 precision photogrammetric scanner and both Leica and Boeing Autometric softcopy workstations. Each image was mosaiced and tone balanced for the purpose of providing seamless coverage, and deliveries were made in an uncompressed, geo-referenced TIF format.
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| Client: |
Baseline Corporation
1702 Seamist Drive, Suite 320
Houston, Texas 77008
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| Contact: |
Pat Going, RPLS
713-869-0155
jpg@baselinesurveyors.net
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| Duration: |
March, 2003 to June, 2003
August, 2004 to October, 2004
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| Project Size: |
2.5 Linear Miles
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| Description: |
Under multiple work orders over a period of eighteen months, WSI provided photogrammetric mapping along a portion of Interstate 10 and Spur 330 in Harris County, Texas near the City of Baytown. This was accomplished for the Texas Department of Transportation, Houston District through one of its survey contractors, Baseline Corporation.
Services included black-and-white aerial photography (1"=250'), analytical aerial triangulation using client-furnished ground control, digital topographic mapping (1"=50', 1' contour interval, MicroStation 3D delivery format), and black-and-white digital orthophotos with a 3" pixel resolution.
The aerial photography was taken with a Leica RC-30 precision mapping camera and consisted of two separate missions with approximately 30-35 exposures for each.
The digital topographic mapping was compiled using Zeiss first-order analytical stereoplotters to normal TxDOT mapping standards. This included the collection and delivery of a dense DTM, which was also used for generating the 1' contours. The map data extended no less than 800' each side of the highway centerlines.
The 2004 work order also included digital orthophotos, which were produced with a Leica DSW300 precision photogrammetric scanner and both Leica and Boeing Autometric softcopy workstations. Each image was mosaiced and tone balanced for providing seamless coverage, and deliveries were made in an uncompressed, geo-referenced TIF format.
Deliveries also included two sets of overlapping 9" x 9" contact prints for each flight mission.
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