Estimation of actual evapotranspiration by remote sensing: Application in Thessaly plain, Greece

Tsouni, A; Kontoes, C; Koutsoyiannis, D; Elias, P; Mamassis, N

dc.contributor.author	Tsouni, A	en
dc.contributor.author	Kontoes, C	en
dc.contributor.author	Koutsoyiannis, D	en
dc.contributor.author	Elias, P	en
dc.contributor.author	Mamassis, N	en
dc.date.accessioned	2014-03-01T01:28:17Z
dc.date.available	2014-03-01T01:28:17Z
dc.date.issued	2008	en
dc.identifier.issn	1424-8220	en
dc.identifier.uri	https://dspace.lib.ntua.gr/xmlui/handle/123456789/18799
dc.subject	Actual evapotranspiration	en
dc.subject	Carlson-Buffum	en
dc.subject	FAO Penman-Monteith	en
dc.subject	Granger	en
dc.subject	NOAA-AVHRR images	en
dc.subject	Remote sensing	en
dc.subject.classification	Chemistry, Analytical	en
dc.subject.classification	Electrochemistry	en
dc.subject.classification	Instruments & Instrumentation	en
dc.subject.other	SURFACE-TEMPERATURE MEASUREMENTS	en
dc.subject.other	THERMAL IR DATA	en
dc.subject.other	AVHRR DATA	en
dc.subject.other	ALGORITHM	en
dc.title	Estimation of actual evapotranspiration by remote sensing: Application in Thessaly plain, Greece	en
heal.type	journalArticle	en
heal.identifier.primary	10.3390/s8063586	en
heal.identifier.secondary	http://dx.doi.org/10.3390/s8063586	en
heal.language	English	en
heal.publicationDate	2008	en
heal.abstract	Remote sensing can assist in improving the estimation of the geographical distribution of evapotranspiration, and consequently water demand in large cultivated areas for irrigation purposes and sustainable water resources management. In the direction of these objectives, the daily actual evapotranspiration was calculated in this study during the summer season of 2001 over the Thessaly plain in Greece, a wide irrigated area of great agricultural importance. Three different methods were adapted and applied: the remote-sensing methods by Granger (2000) and Carlson and Buffum (1989) that use satellite data in conjunction with ground meteorological measurements and an adapted FAO (Food and Agriculture Organisation) Penman-Monteith method (Allen at al. 1998), which was selected to be the reference method. The satellite data were used in conjunction with ground data collected on the three closest meteorological stations. All three methods, exploit visible channels 1 and 2 and infrared channels 4 and 5 of NOAA-AVHRR (National Oceanic and Atmospheric Administration - Advanced Very High Resolution Radiometer) sensor images to calculate albedo and NDVI (Normalised Difference Vegetation Index), as well as surface temperatures. The FAO Penman-Monteith and the Granger method have used exclusively NOAA-15 satellite images to obtain mean surface temperatures. For the Carlson-Buffum method a combination of NOAA-14 and NOAA-15 satellite images was used, since the average rate of surface temperature rise during the morning was required. The resulting estimations show that both the Carlson-Buffum and Granger methods follow in general the variations of the reference FAO Penman-Monteith method. Both methods have potential for estimating the spatial distribution of evapotranspiration, whereby the degree of the relative agreement with the reference FAO Penman-Monteith method depends on the crop growth stage. In particular, the Carlson-Buffum method performed better during the first half of the crop development stage, while the Granger method performed better during the remaining of the development stage and the entire maturing stage. The parameter that influences the estimations significantly is the wind speed whose high values result in high underestimates of evapotranspiration. Thus, it should be studied further in future.	en
heal.publisher	MOLECULAR DIVERSITY PRESERVATION INT	en
heal.journalName	Sensors	en
dc.identifier.doi	10.3390/s8063586	en
dc.identifier.isi	ISI:000257248900001	en
dc.identifier.volume	8	en
dc.identifier.issue	6	en
dc.identifier.spage	3586	en
dc.identifier.epage	3600	en