Knowledge of the times when crop and forest vegetation experience seasonally related changes in development is important in understanding growth and yield relationships. This article describes how densitometry of Earth Resources Technology Satellite (ERTS-1) multispectral scanner (MSS) imagery can be used to identify such phenological events. Adjustments for instrument calibration, aperture size, gray-scale differences between overpasses, and normalization of changing solar elevation are considered in detail. Seasonal vegetation differences can be identified by densitometry of band 5 (0.6-0.7 micrometers) and band 7(0.8-1.1 micrometers) MSS imagery. Band-to-band ratios of the densities depicted the changes more graphically than the individual band readings.

  • Corporate Authors:

    American Society of Photogrammetry

    105 North Virginia Avenue
    Falls Church, VA  United States  22046
  • Authors:
    • Ashley, M D
    • Rea, J
  • Publication Date: 1975-6

Media Info

Subject/Index Terms

Filing Info

  • Accession Number: 00098438
  • Record Type: Publication
  • Files: TRIS
  • Created Date: Sep 30 1975 12:00AM