Percent ground cover is an important characteristic needed for interpreting reflectance and emission signatures of crops for estimation of crop maturity, vigor, and probable yield. Ground survey teams are limited in the area they can cover. In this study, percent crop cover obtained from ground observations is correlated with percent cover estimated from aerial photographs. Six flight lines totaling about 64 km were overflown during a 4-month period at altitudes from 488 to 1219 m using Kodak Ektachrome Infrared Aero 8443 film. Ground observers estimated percent crop cover at the time of the overflights. Later, independent observers estimated percent cover from the photographs with the aid of a magnifying stereoscope. Simple correlation coefficients between percent cover by the two estimating techniques were highly significant (p = 0.01) and were as follows for six crops: cantaloupe, 0.957; citrus, 0.939; corn, 0.950; cotton, 0.982; onion, 0.807; and grain sorghum, 0.945. Number of paired observations was greatest for cotton and sorghum at 182 and 167, respectively. The results indicate that photo estimates of row crop ground cover can be used to replace the tedious and time consuming observations made by ground survey teams.

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  • Corporate Authors:

    American Society of Photogrammetry

    105 North Virginia Avenue
    Falls Church, VA  United States  22046
  • Authors:
    • Gerbermann, A H
    • Cuellar, J A
    • Wiegand, C L
  • Publication Date: 1976-4

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Filing Info

  • Accession Number: 00139273
  • Record Type: Publication
  • Files: TRIS
  • Created Date: Sep 16 1976 12:00AM