Project Examples

USACE St. Louis District – Puerto Rico & USVI Orthophotography, LiDAR, Surveying, & Elevation Mapping

USACE St. Louis District - Puerto Rico & USVI Orthophotography, LiDAR, Surveying, & Elevation Mapping

Northrop Grumman acquired digital aerial photography using Leica ADS40 sensors to simultaneously collect color and color-infrared imagery for the U.S. Army Corps of Engineers (USACE) St. Louis/Jacksonville Districts under a contract to update existing orthophotography for the islands of Puerto Rico and the U.S. Virgin Islands (USVI). A host of government partners provided support to accomplish the mission, including primary partners U.S. Geological Survey (USGS), Puerto Rico Department of Natural and Environmental Resources (DNER), Department of Homeland Security (DHS), National Geospatial-Intelligence Agency (NGA) and the Lieutenant Governor’s Office of the USVI.

Imagery was collected over Puerto Rico and USVI from November 2006 through December 2007, resulting in multispectral data capture for the entire island of Puerto Rico and adjacent islands.

  • Aerial Photography
  • RGB and CIR Digital Orthophotography
  • 0.3-meter Ground Sample Distance (GSD) pixel resolution
  • Airborne GPS Measurements
  • GPS Ground Control Surveys
  • Base Map Accuracy Improvement
  • Bare Earth Surface Models

Size: 5,000 Square Miles

City of Franklin, TN Digital Orthos, LiDAR, & GIS Services

Four phased project:

City of Franklin, TN Digital Orthos, LiDAR, & GIS Services
  1. Aerial imagery and digital orthophotography,
  2. LiDAR acquisition, digital elevation model (DEM) generation, and 2-foot contour creation,
  3. Stereocompilation / feature extraction,
  4. GIS and geodatabase design and development

Northrop Grumman provided the City of Franklin with a comprehensive aerial survey, GPS ground control survey, aerotriangulation, 3-inch and 6-inch digital color orthophotography, and a DEM of the City, the designated Urban Growth Boundary (UGB), and expansion areas. We integrated the resulting imagery and geospatial data developed into the City’s GIS. Northrop Grumman collected LiDAR data to support elevation modeling, stereo models for 3D analysis, feature extraction, and geodatabase design, development, and implementation. Northrop Grumman performed feature classification, including land use/land cover classification and analysis. All geospatial data were furnished in the Tennessee State Plane Coordinate System (FIPSZone 4100), NAD83 (90 Epoch), and NAVD88 in U.S. survey feet.

  • LiDAR data acquisition, FEMA quality DEMs, and 2-foot contours
  • GPS ground control survey and aerotriangulation
  • Digital orthophotography at 3-inch and 6-inch GSD
  • Photogrammetric mapping (building footprints, roadway centerlines, pavement edges, driveways, sidewalks, parking lots, tree lines, fences, canals, water boundaries, manholes, tunnels, and bridges)
  • Digital imagery & LiDAR fusion, feature classification, and geoDB development

This project demonstrated Northrop Grumman's ability to deploy new technology to develop GIS data to meet NMAS and NSSDA standards. We provided the customer with an affordable product in a timely manner, LIDAR and Z/I DMC over a large project area at multiple scales, and validation of the DMC as a superior approach to film.

Richland County, SC Multiyear Countywide Digital Orthophoto Collection

Richland County, SC Multiyear Countywide Digital Orthophoto Collection

Richland County awarded Northrop Grumman a multiyear contract for acquiring digital aerial multispectral imagery and producing digital orthophotography encompassing roughly 772 square miles. Northrop Grumman collected the imagery at 0.9-inch ground sample distance (GSD) pixel size using the Zeiss/Intergraph (Z/I) Imaging Corporation Digital Mapping Camera (DMC) to produce 1-foot GSD pixel size digital orthophotos. The orthophotos are to be used by the GIS Department to update geospatial data layers.

Northrop Grumman provided project management, GPS surveys, imagery acquisition and processing, aerotriangulation, orthorectification, orthophotography generation, and metadata for this project.

Methodology and Deliverables Included:

  • Mission Planning & Flight Line Shapefiles
  • GPS Ground Control Surveys
  • Inertial Measurement Unit (IMU) / Airborne GPS
  • Digital Aerial Imagery Acquisition & Processing
  • Aerial Triangulation
  • Integration of 2-Meter Post-Spacing LiDAR-Derived Digital Elevation Model (DEM) and Digital Terrain Model (DTM) Data
  • Orthorectification & Mosaicking
  • Countywide Digital Orthophotography Production (1-Foot GSD)
    • 4-Band 12-Bit Red (R), Green (G), Blue (B), and Near Infrared (NIR)
    • 8-Bit Natural Color (R,G,B)
    • 8-Bit False Color Infrared (CIR) (R,G,NIR)
  • Color / Tonal Balancing
  • FGDC-Compliant Metadata

Alabama Power Company (APCO) Aerial Imagery, Orthophotography, & LiDAR Services

Miscellaneous Lakes

Digital Terrain Model

Summary: Northrop Grumman collected LiDAR data using a Leica ALS50 sensor and aerial imagery with a DMC. The LiDAR data were used to create bare earth digital terrain models (DTMs) at 3-meter grid spacing, 2-foot and 1-foot contours, and hydrologically-enforced breaklines. Northrop Grumman collected LiDAR data at 2-meter postings and airborne imagery at 5.4-inch ground sample distance (GSD) pixel resolution to produce 6-inch orthophotos for various lakes throughout the state of Alabama. We produced DTMs, contours, and digital orthophotos to support APCO’s GIS basemap. All data meet National Standard for Spatial Data Accuracy (NSSDA) requirements, with the LiDAR data exceeding the 15-centimeter vertical RMSE specification.

Figures (right) depict the 1-foot and 2-foot contours. Green depicts the pool elevation, yellow depicts the 1-foot contour areas, and red depicts the 2-foot contour areas.