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Mcginnis, D. F.

Wiesnet, D. R.

English

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Produced by the NASA Center for Aerospace Information (CASI) 
https://ntrs.nasa.gov/search.jsp?R=19770009461 2020-03-22T10:58:12+00:00Z
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Type II PROGRESS REPORT	 December 27, 1976
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EVALUATION OF LANDSAT-2 DATA
FOR
SELECTED HYDROLOGIC APPLICATIONS
Donald R. Wiesnet, Principal Investigator
David ' F.. McGinnis, Jr., Coinvestigator
Michael Matson, Associate
NOAA/NESS/ESG
World Weather Building
Room 810
Washington, D.C. 20233
i
(E77-10ii69)	 . VALUAiiCN GE LANDSAT-2 DATA
	
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Landsat-2 investigation No. 23170
	 Contract No. NAS-53991A
R ECEI VED
JAN 04 1977
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Landsat-2•Investigation No. 23170
A.	 Problems
None
B. Accomolishments
1.	 Computer-enhanced (DMD) prints and the corresponding rectified
microfilm (full resolution) obtained for April 17, 1975 Landsat pass
over Cranberry Lake. 	 Rectified microfilm accomplished by using the
"nearest neighbor" technique that chooses 32 of 44 or 45 spots to fill
each scan line for a given frame.
	
The result is a frame whose orthoganal
dimensions are equal. 	 Similar prints and microfilm have been generated
for the Sierra snow studies involving density and runoff.
2:	 Snow maps- of three river basins (Pilot Creek, Duncan Creek
and the North Fork of the Middle Fork of the American River), sub-basins
of the American River basin, have been prepared and planimetered for
1973, 1975, and 1976. 	 These basins were selected because of the absence
of storage or diversions above the gaging stations.	 The basins will be
used in the study of snowmelt versus runoff.
	
Microfilm printouts
assembled at a scale close to 1:24,000 permit direct comparison with
U:B.G.S. 7 1/2-minute quadrangles.
3.	 Computer-enhanced (DMD) prints produced for Luverne test site
from Landsat tapes dated 3/30/75, 5 /11/75, and 10/1/75.
4.	 Final y-ray report on Luverne, Minnesota test site received j
from EGEG.	 The 40K and 208T1 photopeak area methods gave average soil
moisture values of 32% and 28%, respectively.	 The gross count rate
method gave an average soil moisture value of 28%, with mile-by-mile
values ranging from 21% to 36%. 	 Ground truth soil moisture values
I
e2
ranged from 23% to 39% with the average value being 28%. The three
methods of surveying soil moisture by y-ray give results consistent
with those obtained by ground truth.
S. Final review of EG&G y-ray report Phoenix, Arizona test site
completed. Published report due shortly. Results show that the 40K and
208T1 photopeak area methods gave average soil moisture values of 22% and
20%, respectively. The gross count method gave an average soil moisture
of 21%, with mile-by-mile values ranging from 14% to 33%. Ground truth
soil moisture values ranged from 8% to 32%, with the average value'being
23%. The photopeak method appears useful to-measure the long-line
soil moisture average and the gross count rate method can be used to
measure soil moisture in one mile or smaller increments.
C. Significant Results
None
D. Publications
None
E. Recommendations
None
F., Funds Expended
None
G. Data Used
CCT's used to produce enhanced images and microfilm of Luverne,
Minnesota, Cranberry Lake, New York, and the American River basin,
California. 91^a2^3Q7
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Evaluation of LANDSAT-2 data for selected hydrologic applications

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