| MAPPING

MAPPING TECHNOLOGY | ELEVATION MODELING

MAPPING TECHNOLOGY
Over the last several years, advanced technology has resulted in the convergence of photogrammetric engineering and digital mapping sciences with integrated map-based information systems. Aero-Metric's approach to the design of customized databases and automated functionality is both innovative, cost effective and reliable.

We utilizes both softcopy and analytical stereoplotter systems to extract planimetric and topographic information from aerial photographs. Our softcopy systems include DAT/EM's Summit Evolution digital photogrammetric workstations which are entirely computer and software driven for performing 3D feature collection from high-resolution scanned aerial images. These advanced mapping systems improve vector data accuracy by removing pixel limitations. The system provides subpixel viewing functionality for measuring, dynamic zooming, and movement within pixels. Analytical stereoplotters allow operators to view film transparencies in 3D for similar mapping applications as with softcopy. All our mapping instruments are equipped with high-speed computers and capture software that provides for efficient collection of map data.

Raw mapping files are processed through an automated editing program that reduces overall editing time by performing batch tasks defined and controlled by the user. Photogrammetrists, cartographers and graphics technicians collaborate to create final map products that are accurate and detailed. Final data are delivered in numerous graphic and digital formats. Mapping Images Gallery...

DIGITAL ELEVATION MODELS & DIGITAL TERRAIN MODELS
A DEM is a collection of discrete elevation points at regularly spaced intervals, while a DTM defines topographic shapes by elevation points at significant topographic features which reflect abrupt changes in relief such as incised streams, ridge lines, and slope breaks. In either case, these data points provide a regular (DEM) or irregular (DTM) pattern of elevation information that can be used for many purposes, such as the generation of a triangular irregular network (TIN), where groupings of three elevation points create adjoining triangular surfaces which mathematically approximate the ground surface.

We utilize two principal methods to collect digital elevation information. The first is a direct measurement process using analytical or softcopy stereoplotter systems. Utilizing analytical stereoplotters, an operator manually defines breaklines and mass points from which the elevation model is generated. If the photographs are scanned, then semi-automated image correlation can be done utilizing softcopy systems.

The second method is an automated measurement process of elevation using LIDAR or interferometric radar systems. Following collection of raw elevation points, the data is post-processed resulting in a digital elevation model of the earth's surface. Elevation Modeling Gallery...

MAPPING TECHNOLOGY | ELEVATION MODELING

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