Lookup NU author(s): Dr Meredith Williams,
Professor Stuart Barr
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Field spectroscopy data of a range of arable crop types were acquired at selected transects perpendicular to a 9 km stretch of buried gas pipeline in Aberdeenshire. Spectral absorption and reflectance features are examined for differences between locations of soil disturbance associated with the pipeline and locations away from the pipeline. A suite of methods: continuum removal, band ratios and derivative analysis, often employed in vegetation remote sensing studies to minimise background effects (such as soil, shadow and atmospheric moisture), are evaluated. The objective being to determine the most effective method(s) of minimising background effects in the data whilst enabling the detection of subtle vegetation stress features associated with pipeline soil disturbance. Results suggest that band ratios and continuum removal of the chlorophyll absorption feature were the most effective methods of both minimising background effects and detecting above pipeline vegetation stress. Most notably Smith et al.’s (2004) 725:702 nm ratio performed consistently well for all sites investigated, exhibiting differences in the ratio in close proximity and further away from the pipeline of up to 63 %. Derivative analysis identified red-edge reflectance peaks associated with above pipeline stress at 725, 700 and 718 nm. Continuum removal of the chlorophyll absorption feature also provided consistent results, increasing in depth with distance from the pipeline. Differences in the depth of the chlorophyll absorption feature were particularly marked a sites with visible evidence of waterlogging.
Author(s): White DC, Williams M, Barr SL
Publication type: Conference Proceedings (inc. Abstract)
Publication status: Published
Conference Name: Annual Conference of the Remote Sensing and Photogrammetry Society
Year of Conference: 2006