What kind of information can remote sensing provide? Remote sensing has the
possibility of offering important water resource-related information to policy makers,
managers, consultants, researchers and to the general public. This information is
potentially useful in legislation, planning, water allocation, performance assessment,impact assessment, research, and in health and environment-related fields. Remote
sensing, with varying degrees of accuracy, has been able to provide information on land
use, irrigated area, crop type, biomass development, crop yield, crop water requirements,
crop evapotranspiration, salinity, water logging and river runoff. This information when
presented in the context of management can be extremely valuable for planning and
evaluation purposes (see Table 1).
Remote sensing has several advantages over field measurements. First, measurements
derived from remote sensing are objective; they are not based on opinions. Second, the
information is collected in a systematic way which allows time series and comparison
between schemes. Third, remote sensing covers a wide area such as entire river basins.
Ground studies are often confined to a small pilot area because of the expense and
logistical constraints. Fourth, information can be aggregated to give a bulk representation,
or disaggregated to very fine scales to provide more detailed and explanatory information
related to spatial uniformity. Fifth, information can be spatially represented through
geographic information systems, revealing information that is often not apparent when
information is provided in tabular form.
What kind of information can remote sensing provide? Remote sensing has thepossibility of offering important water resource-related information to policy makers,managers, consultants, researchers and to the general public. This information ispotentially useful in legislation, planning, water allocation, performance assessment,impact assessment, research, and in health and environment-related fields. Remotesensing, with varying degrees of accuracy, has been able to provide information on landuse, irrigated area, crop type, biomass development, crop yield, crop water requirements,crop evapotranspiration, salinity, water logging and river runoff. This information whenpresented in the context of management can be extremely valuable for planning andevaluation purposes (see Table 1).Remote sensing has several advantages over field measurements. First, measurementsderived from remote sensing are objective; they are not based on opinions. Second, theinformation is collected in a systematic way which allows time series and comparisonbetween schemes. Third, remote sensing covers a wide area such as entire river basins.Ground studies are often confined to a small pilot area because of the expense andlogistical constraints. Fourth, information can be aggregated to give a bulk representation,or disaggregated to very fine scales to provide more detailed and explanatory informationrelated to spatial uniformity. Fifth, information can be spatially represented throughgeographic information systems, revealing information that is often not apparent wheninformation is provided in tabular form.
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