Effect of angular field of view of a video sensor on the image content in a strip target: the example of revegetation monitoring of a pipeline route
The increased environmental regulation of corridor targets has created a need to develop a remote sensing technique operating at a 15-100m swath width. This study examined the suitability of airborne video sensing in relation to coverage angle for a corridor target. Comparisons of image content were made between an aerial photograph (as representative of typical wide-angle sensors) and a full-scene video image. The feature content of the full-scene image was found to be inversely related to sensor coverage angle, owing to the increased disturbance by surrounding thematic elements. It was also found that information variance did not increase beyond a certain stage of decreasing coverage angle. An understanding of the angular discrimination capability of the video sensor was developed by examining the variance of feature content of an image, in terms of operational mapping requirements from multiple coverage image datasets (at 64m, 40m and 20m swath widths). It was concluded that airborne video is a valid technique for reconnaissance mapping of a corridor target, including right-of-way monitoring of a pipeline route.
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