accurate estimation of crop evapotranspiration (etc) plays an important role in improving the water useefficiency (wue) and water management. due to the presence of different types of coatings plant in large areas, the accurate calculation of the water requirements by conventional methods is elusive or impossible. remote sensing methods are becoming attractive to estimate crop evapotranspiratio...

Because of the extreme importance of remote sensing as a data input to GIS, it has. Remote sensing can be defined as any process whereby information is.Remote sensing is the process of acquiring datainformation about. Application G-The final element of the remote sensing process is achieved when we.Abstract : Remote sensing is a technique to observe the earth surface or the atmosphere from. Pro...

Remote sensing can be defined as the “acquisition and measurement of data/information on some property(ies) of a phenomenon, object, or material by a recording device not in physical, intimate contact with the feature(s) under surveillance” (Short 1997). Scientists employing remote sensing are able to collect vast quantities of data quickly and efficiently for rapid analysis. One potential use ...

Satellite remote sensing of air quality has evolved dramatically over the last decade. Global observations are now available for a wide range of species including aerosols, tropospheric O3, tropospheric NO2, CO, HCHO, and SO2. Capabilities for satellite remote sensing of these species in the boundary layer are reviewed for current instruments, along with physical processes affecting their accur...

drought is a natural disaster. because a significant impact on the agricultural and economy sector, it affects the lives of local residents. with using of the remote sensing, drought can be studied through its effects on plants and agriculture resulting in more accurate and effective results found for modeling drought. in this study, the efficiency of agricultural drought indicators for estimat...

the preparation of vegetation cover maps by used the land inventory and a traditional method has a lot of cost and time. but today, remote sensing is one of the main sources of data collection and information production for study and monitoring land resources, and was efficient tools for providing quickly and timely data and information needs for program planning in the natural resource filed. ...

the siyah bisheh area is located in central part of alborz zone, 40km south of amol, iran. rock units exposing in the area consists of sedimentary (carbonates, sandstone, siltstone), volcano- sedimentary (andesite to andesitic tuff, tuff), ignimbrite and basalt. when erosion and tectonics have rendered volcanic structures undetectable, remote sensing provides an invaluable tool for their ide...

total perceptible water (tpw) is an important parameter in climatology and weather forecasting and is directly related to any climate process. there are three approaches to estimate this parameter i.e. using radiosonde, using gps and calculating from satellite images where the first two are localized and the last one can give an instant view of tpw in a vast region. the algorithm used for the t...

groundwater drought denotes the condition and hazard during a prolonged meteorological drought when groundwater resources decline and become unavailable or inaccessible for human use. the aim of this study is to identify the influencial factors on groundwater drought in hamadan- bahar watershed,iran, to understand the forcing mechanisms. the standardised precipitation index (spi) has been used ...

land use may be regarded as one of the most important factors affecting theenvironment with respect to human activities. so far, destroying the rangelands andchanging them into the waste lands and poor rangelands has been proposed as the mostsignificant variations of land use done by human beings. this paper has been conducted toevaluate the variations of vegetation percentage and land uses in ...