Capabilities of Multispectral Aerial Imagery for Military Geographic Information (MGI).

摘要

To meet Army requirements for a more efficient method of obtaining terrain and environmental data, the U. S. Army Engineer Topographic Laboratories (ETL) designed and fabricated a unique multispectral aerial camera. This experimental camera employes a single lens, a beam dispersing system, and dichroic filters to divide the reflected light energy into four broad spectral bands: Blue, green, red, and near infrared. The resulting four spectrally separated images can be reconstituted into a number of displays using a four-channel, optical, additive color viewer. Over the past three years, the camera has been flown over the ETL remote sensor test areas to compare this system with conventional types of aerial photography for acquisition of MGI. During the test, multispectral imagery was obtained simultaneously with color, color IR, color negative, and panchromatic emulsions. In addition, ground data was also acquired during the over flight to ascertain the validity of imagery derived data. The initial results of the comparison indicate that the multispectral imagery provides the image interpreter with a highly flexible imaging system and a number of advantages over conventional emulsions. The advantages include better determination of drainage channels, better shoreline delineation, and better recognition of different vegetation species. (Author)