Ohio Airport Survey / Aerial Photography, Aerotriangulation, Black and White Orthophotos, LiDAR
Type: Airport Obstruction Survey
Period of Contract: 2008
Project Scope, Services and Deliverables:
OPTIMAL provided 1"=660' negative contact scale black and white aerial photography for both ends of the runway and all of airport property with 60% forward overlap and 30% sidelap; Collected LiDAR for Obstruction Analysis at 850m vertical and also 500m forward looking at 20 degrees; Provided Obstruction Analysis detailing obstructions penetrating the glide path to FAA 405 specifications using the LiDAR data; The intent was to obtain all topographic information and geographic features (buildings, towers, poles, trees, etc) necessary to satisfy the requirements; Survey crew provided all supplementary airport data as covered in the Scope of Work; Provided a digital black and white ortho of the survey area with a 1' pixel resolution; Provided planimetric mapping at 1"=100' of the airport property; Provided a 1' contour from the LiDAR bare-earth surface data; utilized H-Datum in NAD83 and V-Datum in NVD88; delivered Softcopy Aerotriangulation.
Area: Runways 7 & 25.
Military Base Aerial Survey / LiDAR, Planimetric, Topographic, AT, & Orthophotography
Type: Military Base Aerial Survey
Period of Contract: 2008
Project Scope, Services and Deliverables:
Deliverable format in ARC/INFO; Control Prints, Processed B/W Film and provided a Camera Calibration Report and Project Plan and Ground Survey Completion Reports; AT Report; DTM, TIN, contours, planimetric data and B/W orthos; Calibrated LiDAR in LAS format; Bare-earth XYZ files; Softcopy Aerotriangulation.
Area: 37 square miles.
Large Midwestern County / 1'=100" Color Orthophotos, DEM, LiDAR and Planimetric Mapping, 1' LiDAR Contours
Type: Aerial Survey and Mapping Project
Period of Contract: 2007-2008
The County solicited proposals for providing color digital orthophotos, digital elevation model and planimetric data collection services. The area covered by the project is a mixture of dense suburban type development and low-density rural agricultural land.
Project Scope, Services and Deliverables:
Flight Plans & Ground Control Layout (Photo & LIDAR) in shapefile & ESRI personal Geodatabase; 1"=833' NCS Color Photography; Aerial Triangulation, AT Report & Digital Files; LIDAR bare-earth in ESRI ASCII GENERATE files and .LAS format; LIDAR first-return in ESRI ASCII GENERATE files and .LAS format; LIDAR raw date, (post-calibrated, pre-filtered) with in E, N, elevation and intensity; Orthophoto Sheet Layout Index in shapefile & ESRI Personal Geodatabase; Color digital orthophotos in GeoTiff format with accompanying TFW (world file) in 6" resolution; Color digital orthophotography files in MrSID (compressed) format; Plan and Topo features files - Layer List in AutoCAD format; Plan and Topo data in ArcGIS Personal Geodatabase, (double precision, 3 decimal places); Raster bare-earth DEM in ESRI ArcGIS compatible format; and Metadata files for Orthos, Plan data layers, Topographic data layers, and raster bare-earth DEM. LiDAR: ALL RAW DATA: All raw (post-calibrated, pre-filtered). Mass point LIDAR data files were delivered for all collection returns, including latitude, longitude elevation, and intensity data. Horizontal data
was provided in the County Coordinates to eight (8) digits of precision in NAD83 HARN 1996 Adjustment datum. Elevation values (z) were provided in integer Centimeters with 1 cm resolution in the NAVD88 datum. The data was provided in both a comma delimited ASCII file and LAS (version 1.1 or newer)
format. FILTERED BARE EARTH DATA: Latitude, longitude, and Elevation data for filtered raw data that represents the bare earth. To restrict data to ground elevations only, elevation points on bridges, buildings and other structures and on vegetation from the LIDAR-derived data were removed. The data was provided in both a comma delimited ASCII file and the LAS (version 1.1 or newer) format. BARE EARTH DEM: Raster based DEM derived form the Bare earth points of FILTERED BARE EARTH DATA above.
Area: 448.3 square miles.
Electric Transmission Line LiDAR Survey of 5,000+ Circuit Miles
Type: Electric Transmission Lines Aerial Survey
Period of Contract: 2006-2008
Project Scope, Services and Deliverables
OPTIMAL was contracted by one of the largest electric utilities in the U.S. The customer serves 13 million people in a service area of 50,000 square miles and has been providing electric service in their region for 120 years. The customer embarked on a project to map over 5,000 circuit miles of transmission lines (possibly the largest single LiDAR contract ever awarded in the US). After evaluating the major service providers in this field they determined that OPTIMAL offered the most economical and technically viable solution that met its survey specifications.
The project was preceded with the creation of a GIS database that utilized digital orthophotos as a land-base to map the location of all transmission structures. The customer was able to utilize this data to determine the number of line miles, circuit miles and areas of shared corridors occupied by its bulk transmission assets. The engineering application of the survey data was used to derive PLS-CADD data sets used by engineering consultants to determine a rating for 230kV and higher lines.
The data was acquired and processed through 2008 as part of a rolling program of work. The benefit of Optimal's fixed-wing acquisition platform has been realized in this project for the numerous lines that have shared corridors.
Data Acquisition:
High density LiDAR data
Forward looking digital video
High res digital photos of existing structures
High resolution orthophotos
Deliverables:
CAD plan right-of-way
1,500'-wide high-resolution digital orthos
Still photo and video imagery
Transmission line data models in PLS-CADD
Modeling of transmission line structures for inclusion in PLS-CADD data
Area: 5,000 circuit miles
US Army Corps of Engineers Mississippi River LiDAR Project
Type: Military Aerial Survey
Period of Contract: 2005-2006
Project Scope, Services and Deliverables
Indefinite Delivery, Indefinite Quantity Contract held with the U.S. Army Corps of Engineers. OPTIMAL surveyed an approximate project area of 1.13 million acres to obtain measurements of the LiDAR bare earth surface as well as the top surface feature elevation data. The goal was to provide geometry input to the USACE Hydraulic Models Program and to produce a comprehensive Hydro Book of the project area. The project included capturing LiDAR data and digital aerial photography to create orthorectified mosaics and a DEM derived from the data set IAW scope of work. The District provided an Arc/GIS shape file of the project area, along with survey monument points used to create the survey control network. LiDAR data met the requirements equivalent to the previous National Standard for Spatial Data Accuracy (NSSDA) (FGDC-STD-007.3-1998) requirements.
Printer-friendly version
Send to friend