Crooks, William T.S. and Cheke, Robert ORCID: 0000-0002-7437-1934 (2014) Soil moisture assessments for brown locust Locustana pardalina breeding potential using synthetic aperture radar. Journal of Applied Remote Sensing (JARS), 8 (1):084898. ISSN 1931-3195 (doi:https://doi.org/10.1117/1.JRS.8.084898)

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Abstract

Synthetic aperture radar (SAR) imagery was collected over a brown locust Locustana pardalina outbreak area to estimate soil moisture relevant to egg development. ERS-2/RadarSat
overpasses and field studies enabled parameterization of surface roughness, volumetric soil moisture, soil texture, and vegetation cover. Data were analyzed both when the target area was assessed as nonvegetated and when treated as vegetated. For the former, using the integral
equation model (IEM) and soil surface data combined with the sensitivity of the IEM to changes in surface roughness introduced an error of ∼ � 0.06 cm3 cm−3 in volumetric soil moisture. Comparison of the IEM modeling results with backscatter responses from the ERS-2/RadarSat imagery revealed errors as high as �0.14 cm3 cm−3, mostly due to IEM calibration problems and the impact of vegetation. Two modified versions of the water cloud model (WCM) were parameterized, one based on measurements of vegetation moisture and the other on vegetation biomass. A sensitivity analysis of the resulting model revealed a positive relationship between increases in both vegetation biomass and vegetation moisture and the backscatter responses from the ERS-2 and RadarSat sensors. The WCM was able to explain up to 80% of the variability found when the IEM was used alone.

Item Type:	Article
Additional Information:	[1] Copyright: (c) The Authors. Published by SPIE under a Creative Commons Attribution 3.0 Unported License. Distribution or reproduction of this work in whole or in part requires full attribution of the original publication, including its DOI. [DOI: 10.1117/1.JRS.8.084898]. [2] In Journal of Applied Remote Sensing, Volume 8, Issue 1 - Special Section on Advances in Remote Sensing Applications for Locust Habitat Monitoring and Management Part II.
Uncontrolled Keywords:	brown locust, Locustana pardalina, egg development, synthetic aperture radar, soil moisture, surface roughness, vegetation, water cloud model, integral equation model
Subjects:	S Agriculture > S Agriculture (General) S Agriculture > SB Plant culture
Faculty / School / Research Centre / Research Group:	Faculty of Engineering & Science > Natural Resources Institute Faculty of Engineering & Science > Natural Resources Institute > Agriculture, Health & Environment Department
Related URLs:	Publisher
Last Modified:	08 May 2016 23:27
URI:	http://gala.gre.ac.uk/id/eprint/11329

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