CHARACTERISTICS OF NDVI FLUCTUATION PATTERN AT IRRIGATED AND NON-IRRIGATED RICE IN DIFFERENT CLIMATE ZONES IN THAILAND

摘要

We have already developed "Peak Detector Algorithm"(PDA) to identify irrigated and non-irrigated area from 10-day composite of NDVI data. The algorithm is based on the NDVI fluctuation patterns linked to irrigation status, number of cultivation in a year, spatial distribution of agricultural field and rainfall. It showed high accuracy in Suphamburi province, Central-Western part of Thailand. Other 3 provinces in different climate regions in Thailand, namely, Khon Kaen (North-Eastern), Chiang Mai (Northern) and Patthalung (Southern) were selected to characterize the NDVI fluctuation pattern and to verify the applicability of the PDA. SPOT Vegetation 10 days composite in these study area shows different NDVI patterns from our previous study are in Suphamburi province. In this paper, the characteristics of NDVI fluctuation pattern, linked to rice cultivation pattern, water availability will be discussed. Further the performance and limitation of PDA in 4 different climate zones will be discussed as well.