VGW Geospatial has been locating, documenting, and mapping vertical obstructions for one of our many customers. Identifying vertical obstructions improves the safety of flight for our DoD and civilian aircrews as they transit numerous countries across the globe. The red dots on the above screenshot represent powerline pylons and the blue dots represent light standards either along roads or within athletic areas. Every dot on the map represents an obstacle that is taller than 50 feet. Most are between 50 and 100 feet, but there are occasional vertical obstructions that reach up to 1,000 feet or more. We use a proprietary process to determine the location and height of each vertical obstruction, assuring accuracy and quality of the data we create. If these remain unidentified they create a substantial risk to our aircrews. The work we do eventually makes it into FAA and DoD flight charts to help promote safety of flight.
VGW Geospatial is one of the few companies that can extract airfield features from stereo imagery to create 3-D airfield maps. We use a system that includes BAE’s Socet GXP and Socet for Arc tied to ESRI’s ArcGIS Desktop 10.x software to create 3-D features. We also use ESRI’s Data Reviewer and other tools ensure attribute data and topology are accurate. We provide deliverable products in shapefile, ESRI file geodatabase, or Google Earth (KML) formats. Shapefiles are the most common open data standard mapping deliverable, while the ESRI file geodatabase is probably the most widely used.
VGW Geospatial has been producing 3-D airfield maps for the past 4 years and has completed 58 airfields all across the globe.
VGW Geospatial provided shoreline mapping services for the Coastal Mapping Program, collecting digital shoreline data in support of NOAA’s nautical charting program. Wilson & Company managed and executed all aspects of the project including aerial photography, GPS surveying, photogrammetric mapping, feature attribution, metadata, and GIS services. Color and tide-coordinated black and white, infrared aerial photography was acquired and GPS control surveys were conducted over the project area. Photogrammetric services include performing analytical aero triangulation and extracting the shoreline at both the MHW and MLLW tidal stages. In addition to the digital shoreline files, aids to navigation and landmarks features were collected. All features were attributed to the RSD Coastal Cartographic Feature Attribution Table (CCFAT).
The City of O’Fallon, Illinois hired VGW Geospatial to provide a highly accurate LiDAR solution for line-of-sight analysis and drainage calculations for approximately 45 square miles of the city limits. VGW Geospatial produced digital surface models and digital terrain models from a low-altitude LiDAR acquisition platform with a vertical RMSE of 0.2-feet.
This LiDAR project has continued to provide the City of O’Fallon with valuable information for many of their Public Works Projects. This dataset has been used to determine obstacle encroachment into the Emergency Services Air Fiber Optics line-of-sight communication system, modeling runoff for the city’s stormwater system, collecting curb lines for each of the city’s streets, and determining line-of-sight restrictions for street signage.
VGW Geospatial has provided the U.S. Army Corps of Engineers, Albuquerque District with surveying and photogrammetric services on two consecutive IDIQ contracts. Services have included photogrammetric mapping requiring acquisition of film and/or digital aerial photography, aerial triangulation, stereo mapping compilation, orthophotography, land use/land cover interpretation, creation of horizontal and vertical control networks, ground control for support of photogrammetric and LiDAR mapping, topographic mapping using total stations or GPS; detailed planimetric surveys; profile and cross section surveys, instrumentation surveys, cadastral surveys, site and utility surveys, and geographic information system (GIS) services.
Project accomplishments include:
· Cochiti Reservoir Historical Baseline Mapping – an award winning study to determine sediment deposition and distribution trends in the reservoir and upstream in the Rio Grande
· Comprehensive Evaluation of Project Datums Compliance Surveys – performing geodetic control and compliance surveys for 70 projects within New Mexico, Colorado, and Texas to establish a consistent basis of elevation at each USACE flood control project
· Las Conchas Post Fire LiDAR – providing data from the canyons to produce two-foot contour equivalent digital elevation data for geometry input to USACE hydraulic model programs for geomorphic and vegetation studies
· Holloman Airforce Base Taxiway Extension and Aircraft Parking Survey and Mapping – performing topographic and planimetric mapping including utility data, digital terrain models for engineering design for demolition plans, site plans, roadway plan and profiles, grading and drainage plans, and utility plans and profiles for construction
The government needed to design and construct a border wall near Calexico, California. The Corps of Engineers contracted with VGW Geospatial to provide the field topographic/planimetric surveying and digital terrain model. The area included a two mile segment along the border that included 60 feet north and 10 feet south of the international boundary.
VGW Geospatial field surveyors used existing horizontal and vertical control to establish control points. The control monuments were set in an area out of the proposed construction disturbance area as these points will be utilized in the design, construction, and asbuilt phases. Surveyors obtained topographic and planimetric mapping data on the ground using both RTK/GPS and robotic total stations. Surveyors used a high rod to locate all features on the south side of the international boundary, and the surveying total station remained on the north side of the international boundary.
VGW Geospatial provided electronic CAD files of the collection in MicroStation along with a Digial Terrain Model (DTM) of the topographic surveys. Random points, breakline points, and planimetric data was provided along with one-foot contours.