نتایج جستجو برای: vegetation cover

تعداد نتایج: 148562  

2012
M. R. Mustapha H. S. Lim M. Z. MatJafri

Arid environment is a dry landscape or region that received an extremely low amount of precipitation. Arid areas are located where vegetation cover is sparse to almost nonexistent. Almost one third of earth land surface is arid or desert. Over desert areas, a number of land cover patterns can be observed. One example is given here for the Arabian Peninsula. The located area can be found in Fig....

2015
Ye Li Yu-Qun Yu Lei Shi

The Asiatic ibex (Capra sibirica) is typically found in the mountains of central Asia, studies on the habitat selection of this animal are few at present. We investigated the bedding and foraging sites selection by line census in the GuRenGuoLeng areas of Central Tianshan Moutains during summer, and assess how environmental factors affect their habitat use. Our results showed that there is no s...

   Agricultural hillslopes with susceptible loess enters a large amount of runoff and sediment into the Gorgan city annually, due to the inappropriate drainage system which cause a lot of financial losses city. The purpose of this study was to investigate the effect of different vegetation scenarios on the runoff and sediment discharge from three hillslopes of catchment of ​​5.9 hectares. The r...

Journal: :Ecological applications : a publication of the Ecological Society of America 2007
Cho-Ying Huang Stuart E Marsh Mitchel P McClaran Steven R Archer

Algorithms relating remotely sensed woody cover to biomass are often the basis for large-scale inventories of aboveground carbon stocks. However, these algorithms are commonly applied in a generic fashion without consideration of disturbances that might alter vegetation structure. We compared field and remote sensing estimates of woody biomass on savannas with contrasting disturbance (fire) his...

2016
Lailan Syaufina

Detection and prediction of peatland cover changes should be conducted due to high rate deforestation in Indonesia. In this work we applied Support Vector Machine (SVM) and Markov Chain Model on multitemporal satellite data to generate the correspondings detection and prediction. The study area is located in the Rokan Hilir district, Riau Province. SVM classification technique used to extract i...

2014
Eric Nielsen Matt Noone

We used a predictive model to map canopy cover of vegetation over seven feet in height (“tall woody vegetation”) at 30-meter resolution over nearly 29 million acres within and adjacent to the range of the greater sage-grouse in Oregon (Figure 1). Texture measures computed at various resolutions from colorinfrared aerial photography provided the main source of predictor data used to produce the ...

2011
Paul A. Knapp

Interpretation of large-scale color infrared and color aerial photography can be a laborand cost-effective means to make inventory of and monitor rangelands while maintaining accuracy. Ground measurements of total vegetation cover, tree, shrub and cacti cover at Organ Pipe Cactus National Monument were taken in 1975 and 1984. Estimates of ground vegetation cover made using large scale (1:1200) ...

2002
WANG Shaoqiang

We use Landsat TM time series data for the years of 1991/1992, 1995/1996 and 1999/2000 to characterize land-cover change in northeast China. With the information on land-cover change and the density of vegetation and soil carbon, we assess the potential effect of land-cover change on vegetation and soil carbon in this region. Our results show a large decrease of 2.76×10km in forest area and a r...

Maryam Moradnezhadi Sahar Delpasand Yousef Askari, Zahra Hossaini

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. ...

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