NDLI: Evaluation of hcmm data for assessing soil moisture and water table depth

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Evaluation of hcmm data for assessing soil moisture and water table depth

Content Provider	NASA Technical Reports Server (NTRS)
Author	Tunheim, J. A. Heilman, J. L. Beutler, G. A. Moore, D. G. Westin, F. C. Heilman, W. E.
Copyright Year	1981
Description	Data were analyzed for variations in eastern South Dakota. Soil moisture in the 0-4 cm layer could be estimated with 1-mm soil temperatures throughout the growing season of a rainfed barley crop (% cover ranging from 30% to 90%) with an r squared = 0.81. Empirical equations were developed to reduce the effect of canopy cover when radiometrically estimating the 1-mm soil temperature, r squared = 0.88. The corrective equations were applied to an aircraft simulation of HCMM data for a diversity of crop types and land cover conditions to estimate the 0-4 cm soil moisture. The average difference between observed and measured soil moisture was 1.6% of field capacity. HCMM data were used to estimate the soil moisture for four dates with an r squared = 0.55 after correction for crop conditions. Location of shallow alluvial aquifers could be accomplished with HCMM predawn data. After correction of HCMM day data for vegetation differences, equations were developed for predicting water table depths within the aquifer (r=0.8).
File Size	20576191
Page Count	206
File Format	PDF
Alternate Webpage(s)	http://archive.org/details/NASA_NTRS_Archive_19820014726
Archival Resource Key	ark:/13960/t8cg4j82x
Language	English
Publisher Date	1981-08-01
Access Restriction	Open
Subject Keyword	Earth Resources And Remote Sensing Earth Resources Program Canopies Vegetation Soil Moisture South Dakota Watersheds Surface Temperature Computerized Simulation Heat Capacity Mapping Mission Depth Thermal Mapping Aquifers Aerial Reconnaissance Diurnal Variations Finite Difference Theory Infrared Radiometers Water Tables Crop Vigor Ground Water Ntrs Nasa Technical Reports Server (ntrs) Nasa Technical Reports Server Aerodynamics Aircraft Aerospace Engineering Aerospace Aeronautic Space Science
Content Type	Text
Resource Type	Technical Report

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