1 AIT Asian Institute of Technology

Discrimination of Thai rice varieties using ground based multiangular hyperspectral reflectance data and biophysical parameters

AuthorArshad, Muhammad
Call NumberAIT RSPR no.AS-09-02
Subject(s)Rice--Varieties--Thailand, Central

NoteA research study submitted in partial fulfillment of the requirements for the degree of Master of Science in Agricultural Systems & Engineering, School of Environment, Resources and Development
PublisherAsian Institute of Technology
Series StatementResearch studies project report ; no. AS-09-02
AbstractFor varieties based accurate crop land cover classification, knowledge of their potential inter discriminating factors is important before imaging their cultivated land area for early and nearly accurate grain production estimation prior to harvesting. Before harvesting nearly accurate variety based land area computation for grain production estimation can help reduce the risk of grain deficiency by taking appropriate grain supply chain maintenance decisions. This research study consisted of a field based experimentation to establish spectral signatures of eight rice varieties namely IR 31, Suphanburi 90, Suphanburi 3, Pathumthani1, IR 35, Suphanburi1, Suphanburi 60 and Pisanulok 2 which are commonly grown in central part of the Thailand. Bidirectional spectral reflectance measurements were done for forward and backward as well as from right and left side for the reflected Sun light from target canopies of above mentioned rice varieties at maximum tillering stage. For reflectance measurements nadir (00) and off nadir viewing angles (+450, +300, +150, - 150, -300, -450) and wavelength spectrum from 400 nm to 1050 nm were considered and measured using a portable spectrometer. Spectral signatures obtained from eight varieties were compared for specified viewing angles, wavelength bands and directions among them. The wavebands and viewing angles which discriminated all of the varieties from each other were evaluated as 540 nm to 560 nm for nadir and off nadir viewing angles i.e. -450, +150, +450 and 840 nm to 860 nm wavelength at -150 for perpendicular plane. Similarly 530 nm to 560 nm and from 640 nm to 680 nm at +300 and -150 respectively in principal plane are potential wavelength bands and viewing angles which can discriminate all eight rice varieties. In addition, a few narrow bands of spectral indices was also tested and normalized difference vegetation index at nadir in both perpendicular and principal planes, red edge reflectance at -450 in perpendicular plane, simple ratio pigment index at nadir in perpendicular plane and at +300 in principal plane, and photochemical reflectance index at nadir in perpendicular plane were evaluated as potential indices for differentiation among all eight rice varieties Plant growth parameters were also studied and insignificant differences among rice varieties were found except for leaf angle. Despite of their insignificance differences among rice varieties, significant correlation was found between chlorophyll content and reflectance in green peak at -450,-150 and +450 in perpendicular plane, between plant height and reflectance at +450 in perpendicular plane, between leaf dry weight and photochemical reflectance index at nadir in perpendicular plane, and between number of tillers and reflectance at +300 in principal plane. This indicates their potential for plant growth and development studies especially to determine crop health status by using remotely sensed data.
Year2009
Corresponding Series Added EntryAsian Institute of Technology. Research studies project report ; no. AS-09-02
TypeResearch Study Project Report (RSPR)
SchoolSchool of Environment, Resources, and Development (SERD)
DepartmentDepartment of Food, Agriculture and Natural Resources (Former title: Department of Food Agriculture, and BioResources (DFAB))
Academic Program/FoSAgricultural and Aquatic Systems(AS)
Chairperson(s)Ranamukharachchi, S. L. ;
Examination Committee(s)Kiyoshi, Honda;Shrestha, Rajendra P.;
Scholarship Donor(s)Higher Education Commission (HEC), Pakistan - AIT Fellowship;
DegreeResearch Studies Project Report (M.Sc.) - Asian Institute of Technology, 2004


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