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TitleAnalysis of NOAA-9 Vegetation Index and Temperature Time Series of Wheat Fields in Western Canada
AuthorToure, A; Condal, A; Brown, R J
SourceCanadian Journal of Remote Sensing 17, 1, 1991.
Alt SeriesEarth Sciences Sector, Contribution Series 20042687
Mediapaper; on-line; digital
File formatpdf
AbstractA 16-week NDVI and a channel 4 brightness temperature time series were used to study the relationship between wheat phenology and AVHRR parameters (NDVI and brightness temperature). Both the NDVI and temperature time series showed definite trends that agree with previous results found in the literature. It was determined that the difference of satellite temperature and mid-day air temperature were useful for distinguishing two important phenological phases: the growing period and the flowering-to-cutting period. The former is characterised by a decrease in the order of 1 to t °C per week, the latter by a rather stable temperature value. The analysis also showed that the NCVI and the time series are correlated; this is attributed to an increase in the NDVI values during the growing period, which increases the vegetation transpiration rate, hence minimizing the difference in temperature between the soil vegetation and the air. The NDVI standard compositing method is not able to eliminate clouds completely.

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