Photogrammetric Services

Orthophoto Production

We are adept in developing projects using LiDAR derived elevation models, as well as the use of autocorrelated surfaces for orthophoto production.

Planimetric Mapping

Northrop Grumman captures all planimetric features in a 3D environment, maintaining x, y, and z values for each individual point, line, and polygon. This enables customers to derive 3-D models of such items as road networks, buildings, utility features, and more. We specialize in capturing natural and manmade features for comprehensive GIS solutions or for individual projects. Our techniques and detailed project management assure consistent results and accurate deliverables.

Topographic Mapping

Northrop Grumman compilers develop topographic data in a softcopy environment; the workflow designed so that edge-matching data results in a seamless project wide topographic representation.

Digital Elevation Models

Northrop Grumman derives elevation models to support flood mapping, ortho generation, 3D simulation, and more. We develop models using a variety of techniques including traditional photogrammetric techniques, LiDAR, and through autocorrelation of digital aerial imagery.

Terrain Modeling

Today's GIS user is relying more and more on the use of 3D models and visualization. Once limited in scope to video games and Hollywood effects, 3D environments have become part of the evolution of GIS, allowing for analysis in x, y, and z. From property appraisal specialists to the modern day war fighter, the need for a highly detailed information in 3D is evident. Northrop Grumman is involved in the development and deployment of terrain models to support 3D analysis. Surfaces derived from LiDAR , photogrammetric techniques, and autocorrelated surfaces, provide a framework for which a "skin" of realistic imagery is applied, creating a lifelike 3D scene.

Autocorrelation

Northrop Grumman has advanced autocorrelation to a point where it can provide the required Digital Elevation Model (DEM) for digital orthophotography creation. Autocorrelation processes involve mathematical computations of common features found in two pictures captured from different perspectives. This allows us to derive a 3D model very quickly and affordably, providing maximum exploitation of imagery captured with digital aerial sensors while providing a basis for orthophotography, terrain modeling, digital elevation models, remote sensing, planimetric mapping, and more.