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Title: Monitoring of land degradation from overgrazing using space-borne radar and optical imagery: A case study in Randi Forest, Cyprus
Authors: Papoutsa, Christiana 
Kouhartsiouk, Demetris 
Themistocleous, Kyriacos 
Christoforou, Michalis 
Hadjimitsis, Diofantos G. 
Keywords: Backscattering coefficient;Land degradation;Overgrazing;SAR;Sentinel-1;Vegetation index
Category: Civil Engineering
Field: Engineering and Technology;Agricultural Sciences
Issue Date: 1-Jan-2016
Source: Earth Resources and Environmental Remote Sensing/GIS Applications VII, Edinburgh, United Kingdom, 27 September 2016 through 29 September 2016
Conference: Earth Resources and Environmental Remote Sensing/GIS Applications VII 
Abstract: © 2016 SPIE. This paper examines how radar and optical imagery combined can be employed for the study of land degradation. A case study was conducted in the Randi Forest, Cyprus, a known overgrazed area for the past 70 years. Satellite optical imagery was used for the calculation of the Normalised Difference Vegetation Index (NDVI) for the time period between December 2015 to July 2016 and C-Band Synthetic Aperture Radar imagery was used to derive correlative changes in backscatter intensity (σ0). The results are indicative of the overgrazing in the area with the temporal and spatial variations of grazing defined. Both the NDVI and the σ0 values demonstrate sudden shifts in vegetation cover following the start of the grazing period with the greatest shifts being evident in close proximity to the location of farms. NDVI and backscatter coefficient correlation was measured at 0.7 and 0.8 for the months of February and April respectively. Shifts in NDVI value by 0.1 correspond to a shift in σ0 by 4 db. VH cross-polarization showed greater sensitivity to changes in vegetation than VV. The paper also examines the capability of C-Band Synthetic Aperture Radar to measure changes in plant structure and vegetation fraction as the result of grazing. Depending on grazing intensity, backscatter coefficient varies according to vegetation density.
Description: Proceedings of SPIE - The International Society for Optical Engineering, Volume 10005, 2016, Article number 1000516
ISSN: 0277786X
DOI: 10.1117/12.2242049
Type: Conference Papers
Appears in Collections:Δημοσιεύσεις σε συνέδρια/Conference papers

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