نتایج جستجو برای: land cover vegetation

تعداد نتایج: 243729  

2017
Xiaosong Li Zengyuan Li Cuicui Ji Hongyan Wang Bin Sun Bo Wu Zhihai Gao

Fractional covers of photosynthetic and non-photosynthetic vegetation are key indicators for land degradation surveillance in the dryland of China. However, there are no available, well validated, and multispectral-based products. Aiming for this, we selected the Beijing and Tianjin Sandstorm Source Region as the study area, and utilized the linear spectral mixture model for generating the frac...

Journal: :مرتع و آبخیزداری 0
زهرا عبدالعلی زاده دانشجوی دکتری مرتعداری، دانشگاه محقق اردبیلی، ایران. عطالله ابراهیمی دانشیار دانشکده منابع طبیعی و علوم زمین دانشگاه شهرکرد، ایران

sabzkouh protected area, with the variety of natural ecosystems and landscapes, is very rich from the point of diversity in climate, topography, habitats and wildlife that is located in central zagros. evidences show that its ecosystems such as other iranian semiarid natural ecosystems, undergone changes in their vegetation structure over the past years. obtaining multi-spectral and multi-tempo...

2007
Hieu Duong Roderik Lindenbergh Norbert Pfeifer George Vosselman

Since 2003 the spaceborne laser altimetry system on board of NASA’s Ice, Cloud and land Elevation Satellite (ICESat) has acquired a large world-wide database of full waveform data organized in 15 products. In this research three products are evaluated over The Netherlands. For this purpose the raw full waveform product, the derived Gaussian decomposition product and the global land evaluation p...

2015
Huiyong Sang Liang Zhai Jixian Zhang Fang An

With the improvement of remote sensing technology, the spatial, structural and texture information of land covers are present clearly in high resolution imagery, which enhances the ability of crop mapping. Since the satellite RapidEye was launched in 2009, high resolution multispectral imagery together with wide red edge band has been utilized in vegetation monitoring. Broad red edge band relat...

2006
Leonardo F. Peres Carlos C. DaCamara

Retrieval of land-surface temperature (LST) using data from MSG/SEVIRI requires adequate estimates of land-surface emissivity (LSE). In this context LSE maps for SEVIRI channels IR3.9, IR8.7, IR10.8, and IR12.0 were developed based on the vegetation cover method. A broadband LSE map (3-14 μm) was also developed for estimating long-wave surface fluxes that may prove to be useful in both energy b...

2010
Chor-Pang Lo

Time sequential Landsat MSS and TM images were used to map land use/cover of the Atlanta metropolitan area for the past 25 years as a component of the NASA-funded Project ATLANTA (ATlanta Land-use ANalysis: Temperature and Air-quality), which has the objective to model the impact of land use/cover change on temperature and air quality in Atlanta. This paper describes a suite of techniques that ...

Natural resource management is requires update and accurate information. Thus, monitor changes would have help to optimal management of natural resources and accurate recognition of resource changes. In this study, using digital data MSS (1977), TM (1988), ETM + (2002) and OLI (2014) studied hamoun wetlands and land cover Its surrounding changes over a period of 38 years (2014-1977) using the c...

2010
Sudhir Gupta K. S. Rajan

Objects on the surface of earth describe unique patterns in time and this is exploited in the proposed land cover classification method enumerated in this paper. The applicability of various distance measures to reasonably find similarity or dissimilarity between time series vegetation index patterns for land cover classification is demonstrated. These distance metrics have inherent advantages ...

2008
Michael Shank

The West Virginia Department of Environmental Protection, in a cooperative agreement with the Office of Surface Mining’s Charleston Field Office, is evaluating the utility of high resolution satellite images for characterizing vegetation patterns on reclaimed surface mines. This paper details the results of the first phase of this project, which sought to determine whether satellite images coul...

2002
Mark E. Jakubauskas Dana L. Peterson Jude H. Kastens David R. Legates

that may be the first to exhibit signs of environmental degradaAbstract tion. An index of interannual variability for natural and manThe southern Great Plains may be one of the first areas in the aged LULC types was developed using phase components United States to show significant and detectable changes in derived from harmonic analysis of a nine-year (1989–1997) vegetation cover as a result o...

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