نتایج جستجو برای: avhrr

تعداد نتایج: 1310  

2001
P. J. Minnett R. H. Evans

The Moderate Resolution Imaging Spectroradiometer (MODIS) on the NASA Earth Observing System satellites Terra and Aqua include infrared bands that are designed for the accurate measurement of sea-surface temperature (SST). In addition to the conventional ‘split-window’ bands in the 10-12 μm atmospheric window (similar in spectral properties to the corresponding channels of the heritage instrume...

2004
Birgitte R. Furevik Dominique Durand Lasse Pettersson

The operational service for algal bloom monitoring at NERSC is primarily based on NOAA AVHRR and SeaWiFS optical data. The service has shown very useful in several occasions since 1998 while severe and harmful blooms of the algae Chattonella sp. were reported from the North Sea off the coast of Denmark. Early detection and mapping of the extent and concentrations of the blooms were achieved. Ho...

2004
Christof J. Weissteiner Walter Kühbauch

Mit Hilfe von Fernerkundung und zusätzlichen Hilfsdaten sind frühzeitige und objektive Ernteprognosen deutlich vor der Ernte möglich. Dies wurde am Beispiel Braugerste für 2 Regionen in Südwest-Deutschland gezeigt. Demnach können Vorhersagen für Flächenerträge von Braugerste (Sommergerste) bereits 3 – 6 Wochen vor der Ernte vorliegen. Die Prognosefehler, welche abhängig vom Prognosezeitpunkt si...

Journal: :International journal of applied earth observation and geoinformation 2021

• First long-term global evaluation of the surface reflectance record from AVHRR. Overall performance close to proposed specification 0.071 ? + 0.0071. No significant variations between seasons. Largest uncertainties found over forest classes. Strong correlations band errors barren and sparsely vegetated areas. The data (LTDR) Advanced Very High-Resolution Radiometer (AVHRR) provides daily with...

ژورنال: :تحقیقات مرتع و بیابان ایران 2011
منوچهر فرج زاده امان اله فتح نیا بهلول علیجانی پرویز ضیائیان

هدف این تحقیق ارزیابی اثر عوامل اقلیمی بر پوشش گیاهی در مراتع زاگرس با شاخص ndvi حاصل از سنجنده avhrr و داده­های هواشناسی می­باشد. منطقه مطالعه­شده مراتع با تراکم­های 75-51، 50-26 و 25-10 درصد زاگرس می­باشد. زمان مطالعه تصاویر ماهواره­ای از ژانویه تا اکتبر 2006 و عوامل اقلیمی از سپتامبر 2005 تا اکتبر 2006 بود. هفت متغیر اقلیمی ماهانه (بارش، دما و رطوبت نسبی (حداکثر، میانگین و حداقل)) بر ndvi ما...

2003
ROBERT G BRYANT

Atmospheric dust loadings have a significant influence on global climate by affecting air temperatures through the absorption and scattering of solar radiation. Many dryland basins are significant sources of aeolian dust, but our knowledge of how dust emissions from these systems are affected by ephemeral wetting events is either limited or poor. This research uses synergistic data sets (Total ...

2010
G. E. Thomas C. A. Poulsen R. Siddans A. M. Sayer E. Carboni S. H. Marsh S. M. Dean R. G. Grainger

The Global Retrieval of ATSR Cloud Parameters and Evaluation (GRAPE) project has produced a global dataset of cloud and aerosol properties from the Along Track Scanning Radiometer-2 (ATSR-2) instrument, covering the time period 1995–2001. This paper presents the validation of aerosol optical depths (AODs) over the ocean from this product against AERONET sun-photometer measurements, as well as a...

2014
Ying Xia Linjun Zhu Hae Young Bae

Remote sensing image automatic registration technology is one of the image processing technologies that have been developed rapidly in recent years, and automatic matching of control points is the core work of the automatic registration. Considering the influence of the cloud points and the phenomenon of uneven distribution of control points in AVHRR images, An automatic matching method of cont...

2001
Jeffrey S. Wilson Timothy S. Brothers Eugenio J. Marcano Pedro Henriquez Urena John F. Kennedy

Spatial and temporal vegetation contrasts between the nations of Haiti and the Dominican are analyzed using NDVI data derived from 30m resolution Landsat imagery and 8km resolution AVHRR imagery from the NOAA / NASA Pathfinder database. Analysis of vegetation dynamics in the Hispaniola border region indicates denser vegetation cover and a stronger correlation between elevation, slope, and NDVI ...

Journal: :Environmental Modelling and Software 2000
Umberto Amato Claudia Angelini Carmine Serio

AVHRR is an imager flying on polar meteorological satellites that, due to its spatial resolution (about 1 km at Nadir view), produces a huge amount of data. A method based on the wavelet packet transform is devised to compress AVHRR images. The method is driven by the compression error (application dependent), so that different types of images have the same quality. The best basis wavelet packe...

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