Aerial Photography  


Precise aerial photography is the single most important element in the preparation of quality mapping. Our aircraft is equipped with a high precision Ziess LMK camera equipped with Forward Motion Compensation (FMC). This eliminates image blurring due to the forward motion of the aircraft. Our plane is also equipped with GPS navigation equipment. Our experienced flight crews have spent many hours onboard these planes and completed thousands of photo missions.

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Surveying


All aerial mapping projects have had ground control layouts prepared. This layout takes into consideration the scale and contour interval of the project, the use for the mapping, the terrain to be controlled, access to the location of the control points, the availability of photo identification points, and the control that is already available in the project area. Accu-Air Surveys has an expert staff of registered professional surveyors, geodesists, and cartographers skilled in all aspects of survey procedures.

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Digital Mapping

 

Maps are compiled on wild and kern stereoplotters and softcopy digital photogrammetric workstations. Supporting software includes Kork, Terramodel, Intergraph, Arc/Info and AutoCad with reformatting capabilities to nearly all known configurations. All digital mapping services are performed by our highly experienced technicians.

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Digital Orthophoto

 

The recent development of affordable high-speed processors and computer storage devices has made digital orthophotography one of the best new tools available to planners and designers.

Digital orthophotos are raster images that can be displayed on a computer at any scale to horizontal accuracies that previously were available only on vector mapping. If hard-copy formats are desired, these images can also be plotted on special output devices.

Digital orthophotos combine the strengths of aerial photographs with the accuracies of vector-based mapping.

The digital orthophoto image is produced by scanning the photographic image on a precision scanner and rectifying the resultant computer image to remove the perspective effects of terrain relief and photo tip-and-tilt. The final product is one that meets the needs of the particular project while minimizing file size.

One of the most important decisions to be made early in the digital ortho process is the selection of the appropriate pixel size. Every digital image is a representation of the ground surface made up of individual computer pixels, with each pixel consisting of 1 byte of information representing a specific block of ground information. Depending on the scale of the final mapping, common resolutions or pixel sizes are .25, .5, 1, or 2 feet.

Many times, digital orthophotos are combined with traditional vector-based mapping to provide even more detailed information. Typically, these vector-based maps will include elevation contours, building footprints, and hydrography.

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Digital Photogrammetry


Digital photogrammetry is the pursuit of photogrammetry utilizing a wide realm of high-tech equipment and instrumentation by skilled professionals that facilitates the collection of geographic data with a high degree of accuracy and precision. People turn to the photogrammetric community for mapping services when accuracy, precision and quality are essential to a project's success.

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Developed By TLS
© 2003 Accu-Air Surveys, Inc.

 

 

Accu-Air Surveys, Inc.