نتایج جستجو برای: landsat imagery

تعداد نتایج: 55956  

2016
Tri Dev Acharya Dong Ha Lee In Tae Yang Jae Kang Lee

Water bodies are essential to humans and other forms of life. Identification of water bodies can be useful in various ways, including estimation of water availability, demarcation of flooded regions, change detection, and so on. In past decades, Landsat satellite sensors have been used for land use classification and water body identification. Due to the introduction of a New Operational Land I...

Successful target detection, especially if there is a similarity between the target and the background area, always is a noticeable issue in remote sensing studies. Because of the spectral behavior similarity to the other phenomena and spatial distribution of these units, the mapping of wind erosion units is difficult. Thus, this study attempts to detect the favorable areas by using matched fil...

2004
Susan Maxwell

he purpose of this article is to present a methodology for filling Landsat Scan Line Corrector (SLC)-off gaps with same-scene spectral data guided by a segmentation model. Failure of the SLC on the Landsat 7 Enhanced Thematic Mapper Plus (ETM+) instrument resulted in a loss of approximately 25 percent of the spectral data. The missing data span across most of the image with scan gaps varying in...

2018
Shannon L. Savage Rick L. Lawrence John R. Squires Joseph D. Holbrook Lucretia E. Olson Justin D. Braaten Warren B. Cohen

There is a pressing need to map changes in forest structure from the earliest time period possible given forest management policies and accelerated disturbances from climate change. The availability of Landsat data from over four decades helps researchers study an ecologically meaningful length of time. Forest structure is most often mapped utilizing lidar data, however these data are prohibiti...

Journal: :Remote Sensing 2017
Linqing Yang Kun Jia Shunlin Liang Xiangqin Wei Yunjun Yao Xiaotong Zhang

Fractional vegetation cover (FVC) is an essential land surface parameter for Earth surface process simulations and global change studies. The currently existing FVC products are mostly obtained from low or medium resolution remotely sensed data, while many applications require the fine spatial resolution FVC product. The availability of well-calibrated coverage of Landsat imagery over large are...

Journal: :Int. J. Applied Earth Observation and Geoinformation 2011
Qingmin Meng Ross K. Meentemeyer

Most of fire severity studies use field measures of composite burn index (CBI) to represent forest fire severity and fit the relationships between CBI and Landsat imagery derived differenced normalized burn ratio (dNBR) to predict and map fire severity at unsampled locations. However, less attention has been paid on the multi-strata forest fire severity, which represents fire activities and eco...

2017
Narayana Reddy

Land surface temperature (LST) is an essential factor in many areas like global climate change studies, urban land use/land cover, geo-/biophysical and also a key input for climate models. LANDSAT 8, the latest satellite from LANDSAT series, has given lot of possibilities to study the land processes using remote sensing. In this study an attempt has been made to estimate LST over Chittoor distr...

Journal: :Ecology 2017
Nicholas E Young Ryan S Anderson Stephen M Chignell Anthony G Vorster Rick Lawrence Paul H Evangelista

Landsat data are increasingly used for ecological monitoring and research. These data often require preprocessing prior to analysis to account for sensor, solar, atmospheric, and topographic effects. However, ecologists using these data are faced with a literature containing inconsistent terminology, outdated methods, and a vast number of approaches with contradictory recommendations. These iss...

ژورنال: آبخیزداری ایران 2019

Soil is one of the most important natural resources of any country. the erosion causes not only the depletion of the soil and the loss of the land, causing great and irreparable damages, but also with the deposition of materials in streams, reservoirs, ports, and reduced pool capacity. Therefore, it should not be underestimated. In this study, we identify and zoning of the erosion areas in the ...

2013
John W. Coulston Dennis M. Jacobs Chris R. King

Quantifying tree canopy cover in a spatially explicit fashion is important for broad-scale monitoring of ecosystems and for management of natural resources. Researchers have developed empirical models of tree canopy cover to produce geospatial products. For subpixel models, percent tree canopy cover estimates (derived from fi ne-scale imagery) serve as the response variable. The explanatory var...

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