Geometric Rectification of High Resolution Airborne Multispectral Data
1990
Lingsch, Stephen C. | Kalcic, Maria T. | Mesick, H. C.
NOARL is developing techniques to map water depths in clear, shallow waters from multispectral imagery. The airborne multispectral system consists of a suite of sensors including the NOARL multispectral scanner, hydrographic airborne laser sounder, Litton 72 Inertial Navigation System, Rockwell Collins Global Positioning System, and a radar altimeter on board a Navy P-3 aircraft. Using an airborne multispectral scanner as an bathymetry sensor requires an accurate geometric registration of measured depth points to image pixels. The absolute depth is derived from a source external to the multispectral sensor (i. e., laser sounder or ship derived depths). In order to accurately model the correlation between the depth and multispectral reflectance these depths must be mapped precisely to the multispectral imagery. Following the mapping procedure, regression techniques are employed to compute a depth for each pixel. Once depths are computed for the entire image, accurate positioning is required for merging independent flightlines to produce accurate high resolution bathymetric charts.
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