BASIC MATTER ENERGY RELATIONSHIPS INVOLVED IN REMOTE RECONNAISSANCE

EARTH SCIENTISTS, SPACE SCIENTISTS AND LIFE SCIENTISTS FREQUENTLY HAVE NEED TO DETECT AND IDENTIFY VARIOUS OBJECTS AND CONDITIONS IN THE PHYSICAL UNIVERSE SOLELY FROM INFORMATION COLLECTED BY SENSORS THAT ARE REMOTELY SITUATED WITH RESPECT TO THE AREA BEING INVESTIGATED. ENERGY THAT IS EITHER EMITTED OR REFLECTED FROM THE OBJECTS OF INTEREST IS RECORDED BY THE SENSORS, EITHER IN PHOTOGRAPHIC FORM OR IN A FORM WHICH CAN BE READILY RECONSTITUTED INTO A PHOTO-LIKE IMAGE. EMPIRICALLY IT HAS BEEN FOUND THAT SOME PARTS OF THE DESIRED INFORMATION ARE BEST OBTAINED WHEN SENSING THE ENERGY RETURNS IN ONE BAND OF THE ELECTROMAGNETIC SPECTRUM, WHILE OTHER PARTS ARE BEST OBTAINED BY SENSING IN A DIFFERENT BAND. THESE CONSIDERATIONS LEAD TO A MAJOR AREA OF CONCERN TO SUBCOMMITTEE I, DEALING AS IT DOES, WITH THE BASIC CHARACTERISTICS OF MATTER AND ENERGY IN RELATION TO IMAGE CREATION BY REMOTE RECONNAISSANCE. THE TIME HAS COME WHEN REAL PROGRESS IN THE ACQUISITION OF INFORMATION BY REMOTE RECONNAISSANCE MUST BE SOUGHT THROUGH FUNDAMENTAL RESEARCH SOLIDLY FOUNDED ON THE BASIC SCIENCES. THIS PAPER FIRST CONSIDERS CERTAIN BASIC CHARACTERISTICS OF THE ELECTROMAGNETIC SPECTRUM THAT ARE OF IMPORTANCE IN THE REMOTE SENSING PROCESS. IT THEN CONSIDERS VARIOUS ELECTROMAGNETIC SOURCES (INCLUDING THE SUN) THAT CAN BE USED IN REMOTE RECONNAISSANCE, AND WHAT HAPPENS TO THE ENERGY FROM THESE SOURCES AS IT ENCOUNTERS VARIOUS MEDIA DURING THE REMOTE SENSING PROCESS. SPECIFIC EXAMPLES SERVE TO ILLUSTRATE THAT ABSORPTION, EMISSION, SCATTERING AND REFLECTION OF ELECTROMAGNETIC ENERGY BY ANY PARTICULAR KIND OF MATTER ARE SELECTIVE WITH REGARD TO WAVELENGTH, AND ARE SPECIFIC FOR EACH PARTICULAR KIND OF MATTER, DEPENDING UPON ITS ATOMIC AND MOLECULAR STRUCTURE. ADDITIONAL EFFECTS EXERTED BY LARGER AGGREGATIONS OF MATTER SUCH AS CRYSTALS, PLANT TISSUES AND EVEN BY LARGE MASSES OF ROCK, SOIL OR VEGETATION ALSO ARE CONSIDERED. THE PAPER CONCLUDES WITH A CONSIDERATION OF THE MANNER IN WHICH ACCURATE BUT HIGHLY COMPLEX DATA WHICH SUMMARIZE BASIC MATTER AND ENERGY RELATIONSHIPS CAN BE PROFITABLY ANALYZED BY AN ELECTRONIC COMPUTER, PERMITTING REMARKABLY ACCURATE PREDICTIONS TO BE MADE OF THE TYPE OF IMAGERY OBTAINABLE WITH VARIOUS REMOTE SENSING DEVICES UNDER VARIOUS ENVIRONMENTAL CONDITIONS. /AUTHOR/

  • Supplemental Notes:
    • Vol 29, No 5, PP 761-799, 19 FIG, 6 TAB, 29 REF
  • Authors:
    • Colwell, R N
  • Publication Date: 1963

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  • Accession Number: 00202662
  • Record Type: Publication
  • Files: TRIS
  • Created Date: Jul 29 1994 12:00AM