Advances in computer and digital imaging technology have enabled the geospatial community to remotely view and analyze land cover and changes in land cover at very high detail. This paper explores the application of detailed change detection using precisely-registered, multitemporal digital aerial photographs. Six inch (0.15 m) spatial resolution color infrared aerial photographs were acquired along the San Diego County section of the U.S./Mexico border in May 2004 and July 2005. A technique referred to as frame center matching was employed during the flight, which enabled precise registration of the multitemporal image frames. Independent check points indicate that a registration root mean square error of 0.49 ft (0.15 m) was achieved. Multitemporal image overlay techniques were used to detect land cover changes associated with fire, development, illegal immigration, and border protection activity. The techniques presented enable the detection of fine-scale land cover changes for resource management.
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