 Orthophotography is aerial photography which has been geometrically corrected (“orthorectified”) so that it has a uniform scale and can be used for measuring just like a traditional map. Since 2001, NCTCOG's Research & Information Services (RIS) Department has facilitated the purchase of high-quality, color, digital aerial photography (orthos) for North Central Texas as a cost-sharing objective for local governments and other entities.
The major two technologies for aerial large format digital imaging are the frame imaging approach as implemented in the Microsoft-UltraCam and the Intergraph-DMC and the linear array technology (Pushbroom) by Leica in their ADS-40 and up. The large format framing cameras “stitch“ an image from individually collected smaller image segments or tiles with a sophisticated technology to ensure a geometrically accurate and seamless single large format image. Pushbroom orthophotography produces one large file per linear array and flight line and is especially good for large regional flights. Either system can be used to acquire highly accurate orthophotography. When planning a project, NCTCOG will determine the best camera to use based upon project size and layout. For more information on frame and pushbroom orthophotography, see the FAQ’s below.
Frequently Asked Questions
Due to the success of the project and subsequent realized savings, a majority of the local governments in North Central Texas purchase their aerial photography through NCTCOG's cooperative program. As such, the scope of any project is dependent upon the needs of that year’s participating entities. Aerial imagery may be viewed, printed, and purchased in digital format after a project completes at www.dfwmaps.com.
Digital Orthophotography Products by Year
For more information about aerial photography, contact Shelley Broyles at 817-695-9156 or via email.
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