Harvest monitoring of Kenyan tea plantations with X-band SAR

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dc.contributor.author Snapir, Boris
dc.contributor.author Waine, Toby W.
dc.contributor.author Corstanje, Ronald
dc.contributor.author Redfern, Sally P.
dc.contributor.author De Silva, Jacquie
dc.contributor.author Kirui, Charles
dc.date.accessioned 2018-03-07T16:03:43Z
dc.date.available 2018-03-07T16:03:43Z
dc.date.issued 2018-02-23
dc.identifier.citation Snapir B, Waine TW, Corstanje R, Redfern S, De Silva J, Kirui C, Harvest monitoring of Kenyan tea plantations with X-band SAR, IEEE Journal of Selected Topics in Applied Earth Observations and Remote Sensing, Vol. 11, Issue 3, March 2018, pp. 930-938 en_UK
dc.identifier.issn 1939-1404
dc.identifier.uri http://dx.doi.org/10.1109/JSTARS.2018.2799234
dc.identifier.uri http://dspace.lib.cranfield.ac.uk/handle/1826/13054
dc.description.abstract Tea is an important cash crop in Kenya, grown in a climatically restricted geographic area where climatic variability is starting to affect yield productivity levels. This paper assesses the feasibility of monitoring tea growth between, but also within fields, using X-band COSMO-SkyMed SAR images (five images at VV polarization and five images at HH polarization). We detect the harvested and nonharvested areas for each field, based on the loss of interferometric coherence between two images, with an accuracy of 52% at VV polarization and 74% at HH polarization. We then implement a normalization method to isolate the scattering component related to shoot growth and eliminate the effects of moisture and local incidence angle. After normalization, we analyze the difference in backscatter between harvested and nonharvested areas. At HH polarization, our backscatter normalization reveals a small decrease (∼0.1 dB) in HH backscatter after harvest. However, this decrease is too small for monitoring shoot growth. The decrease is not clear at VV polarization. This is attributed to the predominantly horizontal orientation of the harvested leaves. en_UK
dc.language.iso en en_UK
dc.publisher IEEE en_UK
dc.rights Attribution-NonCommercial 4.0 International *
dc.rights.uri http://creativecommons.org/licenses/by-nc/4.0/ *
dc.subject Backscatter en_UK
dc.subject Synthetic aperture radar en_UK
dc.subject Coherence en_UK
dc.subject Monitoring en_UK
dc.subject Agriculture en_UK
dc.subject Remote sensing en_UK
dc.subject Productivity en_UK
dc.subject Tea en_UK
dc.title Harvest monitoring of Kenyan tea plantations with X-band SAR en_UK
dc.type Article en_UK

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