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Remote measurement of turbidity and chlorophyll through aerial photographyStudies were conducted utilizing six different film and filter combinations to quantitatively detect chlorophyll and turbidity in six farm ponds. The low range of turbidity from 0-35 JTU correlated well with the density readings from the green band of normal color film and the high range above 35 JTU was found to correlate with density readings in the red band of color infrared film. The effect of many of the significant variables can be reduced by using standardized procedures in taking the photography. Attempts to detect chlorophyll were masked by the turbidity. The ponds which were highly turbid also had high chlorophyll concentrations; whereas, the ponds with low turbidity also had low chlorophyll concentrations. This prevented a direct correlation for this parameter. Several suggested approaches are cited for possible future investigations.
Document ID
19740010925
Acquisition Source
Legacy CDMS
Document Type
Contractor Report (CR)
Authors
Schwebel, M. D. (Texas A&M Univ. College Station, TX, United States)
James, W. P. (Texas A&M Univ. College Station, TX, United States)
Clark, W. J. (Texas A&M Univ. College Station, TX, United States)
Date Acquired
September 3, 2013
Publication Date
December 1, 1973
Subject Category
Geophysics
Report/Patent Number
NASA-CR-140940
RSC-47
Accession Number
74N19038
Funding Number(s)
CONTRACT_GRANT: NGL-44-001-001
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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