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Irrigation


GCMD >> EARTH SCIENCE >> Agriculture >> Agricultural Plant Science >> Irrigation
Movie ID Title
One of the biggest changes to global agriculture is less about the food itself as it is about the water we use to grow it. In some areas, farmers are using freshwater resources - including groundwater - at an alarming rate. The GRACE satellites enable scientists to discover changes to underground aquifers by monitoring changes in the Earth's gravity. In northern India, farmers rely heavily on irrigation to grow crops, and the resulting massive aquifer depletion creates an uncertain future for the region. <p><p><p><p>For complete transcript, click <a href= 10512 Science for a Hungry World: Growing Water Problems
Water specialists Rick Allen, Bill Kramber and Tony Morse have created an innovative satellite-based method that maps agricultural water consumption. The team uses Landsat thermal band data to measure the amount of water evaporating from the soil and transpiring from plants' leaves. Evapotranspiring water absorbs energy, so farm fields consuming more water appear cooler in the thermal band. The Landsat observations provide an objective way for water managers to assess on a field-by-field basis how much water agricultural growers are using. Landsat is a joint program of NASA and the US Geological Survey.<p><p>For complete transcript, click <a href= 10484 Landsat: A Space Age Water Gauge

GCMD >> EARTH SCIENCE >> Human Dimensions >> Habitat Conversion/Fragmentation >> Irrigation
Movie ID Title
An animation of the evaporation of the Aral Sea using Landsat imagery from 1973, 1987, and 2000. 3112 Aral Sea Evaporation (WMS)

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