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This paper describes a new procedure for hydrological data collection and assessment of agricultural and environmental water use using public domain satellite data. The variability of the annual water balance for Sri Lanka is estimated using observed rainfall and remotely sensed actual...
Ten day estimates of actual evaporation in Sri Lanka have been made for the period June 1999–2000, using AVHRR radiances from day-time ascending mode passes of the NOAA 14 meteorological satellite, supplemented with meteorological data measured simultaneously at ground level. During the...
Information on crop-water demand, water use, soil moisture and plant growth at different stages of the cultivation can nowadays be retrieved from satellite data. In this research study, NOAA satellite data were used to assess the performance of three large irrigation systems in Sri Lanka during...
The Department of Meteorology of Sri Lanka receives NOAA-AVHRR images daily. Normalized Difference Vegetation Index (NDVI) can be deduced from this raw satellite data to estimate the photosynthetic activity of chlorophyll. Surface temperature and surface albedo values based on the AVHRR...
Routine measurement of spatially averaged surface fluxes of sensible heat ( H ) in river basins is now feasible. These fluxes, when combined with net radiation estimates, can be used to derive areally averaged actual evapotranspiration (ET). The scintillation method is shown to be promising...
Water resources planning depends on the physical environments, notably on the vegetation and hydrological conditions in river basins. Vegetation growth—both natural and human induced—has a strong dynamic behavior which, especially at larger scales, is difficult to survey in the field. Low...
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