نتایج جستجو برای: especially in vegetation areas
تعداد نتایج: 17004845 فیلتر نتایج به سال:
Background and objectives: Alongside with the progresss in satellite sensors, their role on obtaining information and study of the environmental events and phenomena have become increasingly important. One of these precious data which is the basis for many planning and decision making in rangelands, is the above ground net primary production assements. The traditional method of estimating ANPP ...
The Urban Heat Island (UHI) is the phenomenon of altered increased temperatures in urban areas compared to their rural surroundings. UHIs grow and intensify under extreme hot periods, such as during heat waves, which can affect human health and also increase the demand for energy for cooling. This study applies remote sensing and land use/land cover (LULC) data to assess the cooling effect of v...
Vegetation cover of Rangelands with have effective role in water reserve and soil conservation. Grazing by domesticated animals in rangelands protect desirable and palatable species and sustainable production in rangeland ecosystem. In order to investigation grazing effects on soil infiltrations and physical-chemical properties an experiment was conducted at three regions, consisted of refere...
Vegetation cover is an important component of terrestrial ecosystems that changes seasonally. Accurate parameterization of vegetation cover dynamics through developing indicators of periodic patterns can assist our understanding of vegetation-climate interactions. The current study was conducted to investigate and model vegetation changes in some phytogeographical regions of Iran including, Kha...
This paper examines the utility of hyperspectral remote sensing to detect fresh and dry biomass, water content, and plant area index of burned and unburned grassland in southern California. Contrary to many previously published reports, the Normalized Difference Vegetation Index (NDVI, a vegetation greenness index) was not a good indicator of any of these important biophysical properties in eit...
The integration between vegetation data, human disturbance factors, and geo-spatial data (Digital Elevation Model (DEM) and image data) is a particular challenge for vegetation mapping in mountainous areas. The present study aimed to incorporate the relationships between species distribution (or vegetation spatial distribution pattern) and topography and human disturbance factors with remote se...
Accurate estimates of wetland above ground biomass (AGB) have increasingly been identified as a critical component for an efficient wetland monitoring and management system. Multispectral remote sensing based indices have proven inadequate in estimating biomass especially at high canopy density. In this study we investigated the use of vegetation indices derived from field hyperspectral data to...
Our ability to prevent extinction in declining populations often depends on effective management of habitats that are disturbed through wildfire, logging, agriculture, or development. In these disturbed landscapes, the juxtaposition of multiple habitat types can be especially important to fledglings and young birds, which may leave breeding grounds in human-altered habitat for different habitat...
Current approaches to local rough-terrain navigation are limited by their ability to build a terrain model from sensor data. Available sensors make very indirect measurements of quantities of interest such as the supporting ground surface and the location of obstacles. This is especially true in domains where vegetation may hide the ground surface or partially obscure obstacles. This thesis pre...
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