04205nas a2200457 a 4500 20260818155534.0 220216s2020 th uu m|rtt 0 eng d .b12379736 AIT Diss. no.RS-20-05 Sukij Skawsang Modeling rice pest occurrence in Thailand using a combination of satellite time series and machine learning Pathum Thani, Thailand : Asian Institute of Technology, 2020 90 leaves : ill. Dissertation ; no. RS-20-05 A dissertation submitted in partial fulfillment of the requirements for the degree of Doctor of Philosophy in Remote Sensing and Geographic Information Systems Thesis (Ph.D.) - Asian Institute of Technology, 2020 The brown planthopper Nilaparvata lugens (BPH) is one of the most harmful insect pests in rice paddy fields, which causes considerable yield loss and consequent economic problems, particularly in the central plain of Thailand. Accurate and timely forecasting of pest population incidence would support farmers in planning effective mitigation. In this study, artificial neural network (ANN), random forest (RF) and classic multiple linear regression (MLR) analyses were applied and compared to forecast the BPH population using ground-based weather and satellite-based host-plant phenology factors during the crop dry season from 2006 to 2016 in the central plain of Thailand. Tmin without lag and NDVI at a one-month lag were selected as the major factors in the multiple linear regression model based on their high correlation coefficients. Moreover, the combination of these variables yielded higher accuracy in predicting light trap catches than weather variables alone. On the testing dataset, ANN model (with R2 and RMSE value of 0.770 and 1.686) performed more accurate than RF model (with R2 and RMSE value of 0.754 and l.737) and MLR model (with R2 and RMSE value of 0.645 and 2.015) for short-term BPH density forecasting. Then, an ANN-based prediction map of BPH abundances in dry season 201112012 from December to March was generated. This finding indicates that the utilization of ground meteorological observations, satellite-derived NDVI time series, and machine learning approaches have the potential to predict BPR population density in support of integrated pest management programs. We expect the results from this study can be applied in conjunction with the satellite- based rice monitoring system developed by the Geo-Informatic and Space Technology Development Agency of Thailand (GISTDA) to support an effective pest early warning system. Agriculture Thailand Remote sensing Agricultural pests Biological control Nagai, Masahiko, Chairperson Tripathi, Nitin Kumar, Examination Committee Sasaki, Nophea, Examination Committee National Science and Technology Development Agency (NSTDA), Thailand, Scholarship Donor Asian Institute of Technology. Dissertation ; no. RS-20-05 Full-Text http://203.159.5.9/ait-thesis/detail.php?q=B15875 .b12379736 mnait m 240419 0 220216 m a m 0 mnait mnait mnarc mnarc 40 20 67 Barcode : 30050120888499 CREATED : 2022-11-02 RECORD # : i13365332 LPATRON : 0 LCHKIN : - # RENEWALS : 0 # OVERDUE : 0 IUSE3 : 0 TOT CHKOUT : 0 TOT RENEW : 0 Barcode : 30050211021810 CREATED : 2022-02-16 RECORD # : i13366452 LPATRON : 1028193 LCHKIN : 2022-11-19 # RENEWALS : 0 # OVERDUE : 0 IUSE3 : 1 TOT CHKOUT : 1 TOT RENEW : 2 Barcode : 30050211021802 CREATED : 2022-02-16 RECORD # : i13366464 LPATRON : 0 LCHKIN : - # RENEWALS : 0 # OVERDUE : 0 IUSE3 : 1 TOT CHKOUT : 0 TOT RENEW : 0 Barcode : - CREATED : 2022-02-28 RECORD # : i13370352 LPATRON : 0 LCHKIN : - # RENEWALS : 0 # OVERDUE : 0 IUSE3 : 0 TOT CHKOUT : 0 TOT RENEW : 0 77629 77629 0 0 0 0 MAIN MAIN mnarc 2026-08-18 0 AIT Diss. no.RS-20-05 30050120888499 2026-08-18 15:55:34 1 2026-08-18 40 0 0 0 0 MAIN MAIN mnait 2026-08-18 50.00 0 AIT Diss. no.RS-20-05 30050211021810 2026-08-18 15:55:34 1 2026-08-18 20 0 0 0 0 MAIN MAIN mnait 2026-08-18 50.00 0 AIT Diss. no.RS-20-05 30050211021802 2026-08-18 15:55:34 2 2026-08-18 20 0 0 0 0 MAIN MAIN mnarc 2026-08-18 0 AIT Diss. no.RS-20-05 2026-08-18 15:55:34 2026-08-18 67