نتایج جستجو برای: landsat.

تعداد نتایج: 9827  

پایان نامه :وزارت علوم، تحقیقات و فناوری - دانشگاه شهرکرد - دانشکده کشاورزی 1390

مطالعه حاضر در سه بخش، با هدف بررسی تغییرات و تحولات پوشش اراضی، شناسایی و طبقه‎بندی خاک‎ها و ارزیابی کیفی تناسب اراضی منطقه اردستان برای دو محصول مهم منطقه (یونجه و جو) با استفاده از روش‎های‎ فائو (محدودیت ساده و پارامتریک) و تکنیک‎های تصمیم‎گیری چندمعیاری (ahp و fuzzzy ahp) و همچنین مقایسه کارایی روش‎های مبتنی بر منطق بولین و فازی صورت گرفت. به منظور بررسی روند تخریب اراضی منطقه در طی سه دهه ...

2001
P. M. Teillet J. L. Barker B. L. Markham R. R Irish G. Fedosejevs J. C. Storey

Early in its mission, the Landsat-7 spacecraft was temporarily placed in a ‘‘tandem’’ orbit very close to that of the Landsat-5 spacecraft in order to facilitate the establishment of sensor calibration continuity between the Landsat-7 Enhanced Thematic Mapper Plus (ETM+) and Landsat-5 Thematic Mapper (TM) sensors. The key period for the tandem configuration was June 1–4, 1999, during which hund...

Journal: :Remote Sensing 2016
Milton Isaya Ndossi Ugur Avdan

This paper presents a Python QGIS (PyQGIS) plugin, which has been developed for the purpose of producing Land Surface Temperature (LST) maps from Landsat 5 TM, Landsat 7 ETM+ and Landsat 8 TIRS, Thermal Infrared (TIR) imagery. The plugin has been developed purposely to ease the process of LST extraction from Landsat Visible, Near Infrared (VNIR) and TIR imagery. It has the ability to estimate L...

Journal: :Remote Sensing 2012
Lahiru S. Wijedasa Sean Sloan Dimitrios G. Michelakis Gopalasamy R. Clements

Landsat can be used to map tropical forest cover at 15–60 m resolution, which is helpful for detecting small but important perturbations in increasingly fragmented forests. However, among the remaining Landsat satellites, Landsat-5 no longer has global coverage and, since 2003, a mechanical fault in the Scan-Line Corrector (SLC-Off) of the Landsat-7 satellite resulted in a 22–25% data loss in e...

2010
Susan K Maxwell Matthew Airola John R Nuckols

BACKGROUND The recent U.S. Geological Survey policy offering Landsat satellite data at no cost provides researchers new opportunities to explore relationships between environment and health. The purpose of this study was to examine the potential for using Landsat satellite data to support pesticide exposure assessment in California. METHODS AND RESULTS We collected a dense time series of 24 L...

2011
Darrel L. Williams Molly E. Brown Jeffrey G. Masek Compton J. Tucker Celeste Jarvis

Landsat image data have been used to document global land cover and land use change since 1972. The archive of Landsat imagery constitutes some of the most valuable climate data records available to the world. There has been a longstanding interest in not only maintaining the continuity of Landsat imaging, but in increasing its temporal repeat frequency to improve agricultural and ecological mo...

Journal: :Int. J. Applied Earth Observation and Geoinformation 2015
Dimitris Poursanidis Nektarios Chrysoulakis Zina Mitraka

An image dataset from the Landsat OLI spaceborne sensor is compared with the Landsat TM in order to evaluate the excellence of the new imagery in urban landcover classification. Widely known pixel-based and object-based image analysis methods have been implemented in this work like Maximum Likelihood, Support Vector Machine, k-Nearest Neighbor, Feature Analyst and Sub-pixel. Classification resu...

Journal: :Remote Sensing 2017
Darius Phiri Justin Morgenroth

Land cover classification of Landsat images is one of the most important applications developed from Earth observation satellites. The last four decades were marked by different developments in land cover classification methods of Landsat images. This paper reviews the developments in land cover classification methods for Landsat images from the 1970s to date and highlights key ways to optimize...

2008
Michael A. Wulder Joanne C. White Samuel N. Goward Jeffrey G. Masek James R. Irons Martin Herold Warren B. Cohen Thomas R. Loveland Curtis E. Woodcock

Initiated in 1972, the Landsat program has provided a continuous record of earth observation for 35 years. The assemblage of Landsat spatial, spectral, and temporal resolutions, over a reasonably sized image extent, results in imagery that can be processed to represent land cover over large areas with an amount of spatial detail that is absolutely unique and indispensable for monitoring, manage...

Journal: :Environmental monitoring and assessment 2005
Peter Leimgruber Catherine A Christen Alison Laborderie

Landsat 7's recent malfunctioning will result in significant gaps in long-term satellite monitoring of Earth, affecting not only the research of the Earth science community but also conservation users of these data. To determine whether or how important Landsat monitoring is for conservation and natural resource management, we reviewed the Landsat program's history with special emphasis on the ...

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