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| Titel |
Crop evapotranspiration estimation using remote sensing and the existing network of meteorological stations in Cyprus |
| VerfasserIn |
G. Papadavid, D. Hadjimitsis, S. Michaelides, A. Nisantzi |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1680-7340
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| Digitales Dokument |
URL |
| Erschienen |
In: Precipitation: Measurement, Climatology, Remote Sensing, and Modeling (EGU Session 2010) ; Nr. 30 (2011-05-09), S.39-44 |
| Datensatznummer |
250017156
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| Publikation (Nr.) |
 copernicus.org/adgeo-30-39-2011.pdf |
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| Zusammenfassung |
| Cyprus is frequently confronted with severe droughts and
the need for accurate and systematic data on crop evapotranspiration (ETc)
is essential for decision making, regarding water irrigation management and
scheduling. The aim of this paper is to highlight how data from
meteorological stations in Cyprus can be used for monitoring and determining
the country's irrigation demands. This paper shows how daily ETc can be
estimated using FAO Penman-Monteith method adapted to satellite data and
auxiliary meteorological parameters. This method is widely used in many
countries for estimating crop evapotranspiration using auxiliary
meteorological data (maximum and minimum temperatures, relative humidity,
wind speed) as inputs. Two case studies were selected in order to determine
evapotranspiration using meteorological and low resolution satellite data
(MODIS – TERRA) and to compare it with the results of the reference method
(FAO-56) which estimates the reference evapotranspiration (ETo) by using
only meteorological data. The first approach corresponds to the FAO
Penman-Monteith method adapted for using both meteorological and remotely
sensed data. Furthermore, main automatic meteorological stations in Cyprus
were mapped using Geographical Information System (GIS). All the
agricultural areas of the island were categorized according to the nearest
meteorological station which is considered as "representative" of the
area. Thiessen polygons methodology was used for this purpose. The intended
goal was to illustrate what can happen to a crop, in terms of water
requirements, if meteorological data are retrieved from other than the
representative stations. The use of inaccurate data can result in low yields
or excessive irrigation which both lead to profit reduction. The results
have shown that if inappropriate meteorological data are utilized, then
deviations from correct ETc might be obtained, leading to water losses or
crop water stress. |
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