نتایج جستجو برای: تصاویر landsat

تعداد نتایج: 24956  

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...

2002
James E. Vogelmann

The broad overviews obtained with Landsat data can provide information concerning the location, types, and magnitudes of forest changes not easily obtainable by other means. One of the main goals of the current study is to provide spatial information regarding the more subtle forms of forest change rather than those primarily related to land cover conversion. A forest-dominated area in northern...

Journal: :Applied geography 2015
Trang VoPham John P Wilson Darren Ruddell Tarek Rashed Maria M Brooks Jian-Min Yuan Evelyn O Talbott Chung-Chou H Chang Joel L Weissfeld

Accurate pesticide exposure estimation is integral to epidemiologic studies elucidating the role of pesticides in human health. Humans can be exposed to pesticides via residential proximity to agricultural pesticide applications (drift). We present an improved geographic information system (GIS) and remote sensing method, the Landsat method, to estimate agricultural pesticide exposure through m...

Journal: :Remote Sensing 2017
Yu Mo Michael S. Kearney J. C. Alexis Riter

The Deepwater Horizon oil spill, the second largest marine oil spill in history, contaminated over a thousand kilometers of coastline in the Louisiana salt marshes and seriously threatened this valuable ecosystem. Measuring the impacts of the oil spill over the large and complex coast calls for the application of remote sensing techniques. This study develops a method for post-Deepwater Horizon...

2015
Khaled Hazaymeh Quazi K. Hassan

Here, our objective was to develop a spatio-temporal image fusion model (STI-FM) for enhancing temporal resolution of Landsat-8 land surface temperature (LST) images by fusing LST images acquired by the Moderate Resolution Imaging Spectroradiometer (MODIS); and implement the developed algorithm over a heterogeneous semi-arid study area in Jordan, Middle East. The STI-FM technique consisted of t...

Journal: :Remote Sensing 2017
Jeremie Mouginot Eric J. M. Rignot Bernd Scheuchl Romain Millan

Satellite remote sensing data including Landsat-8 (optical), Sentinel-1, and RADARSAT-2 (synthetic aperture radar (SAR) missions) have recently become routinely available for large scale ice velocity mapping of ice sheets in Greenland and Antarctica. These datasets are too large in size to be processed and calibrated manually as done in the past. Here, we describe a methodology to process the S...

2003
Rick Mueller Martin Ozga

A collection of Landsat scenes corresponding to an entire state or a major portion of a state, are categorized based on ground truth information collected from farmers by USDA enumerators. However, no farmer reported data is revealed or derivable from the categorized Landsat scenes due to confidentiality protections. The individual categorized Landsat scenes need to be geo-referenced and stitch...

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...

2016
Fernando J. Aguilar Abderrahim Nemmaoui Manuel A. Aguilar Mimoun Chourak Yassine Zarhloule Andrés M. García Lorca Eric J. Jokela

A quantitative assessment of forest cover change in the Moulouya River watershed (Morocco) was carried out by means of an innovative approach from atmospherically corrected reflectance Landsat images corresponding to 1984 (Landsat 5 Thematic Mapper) and 2013 (Landsat 8 Operational Land Imager). An object-based image analysis (OBIA) was undertaken to classify segmented objects as forested or non...

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