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Mapping land surface emissivity from NDVI: Application to European, African, and South American areas

Valor, Enric ; Caselles, Vicente

Remote Sensing of Environment, 1996-09, Vol.57 (3), p.167-184 [Periódico revisado por pares]

New York, NY: Elsevier Inc

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Título:
Mapping land surface emissivity from NDVI: Application to European, African, and South American areas
Autor: Valor, Enric ; Caselles, Vicente
Assuntos: AFRICA ; AFRIQUE ; Agronomy. Soil science and plant productions ; AMBIENT TEMPERATURE ; AMERICA DEL SUR ; AMERIQUE DU SUD ; Animal, plant and microbial ecology ; Biological and medical sciences ; CARTOGRAFIA ; CARTOGRAPHIE ; CARTOGRAPHY ; CLIMATIC CHANGE ; DATA COVARIANCES ; Earth, ocean, space ; Ecosystems ; ENVIRONMENTAL SCIENCES ; EUROPA ; EUROPE ; Exact sciences and technology ; External geophysics ; FORECASTING ; FOTOGRAFIA ; Fundamental and applied biological sciences. Psychology ; General aspects. Techniques ; Geophysics. Techniques, methods, instrumentation and models ; INFRARED IMAGERY ; LAND ; Mapping ; MATHEMATICAL MODELS ; MEASUREMENT ; MEDICION ; MESURE ; MODEL ERRORS ; MODEL VALIDATION ; MODELE MATHEMATIQUE ; MODELOS MATEMATICOS ; NORMALIZED DIFFERENCE VEGETATION INDEX ; PHOTOGRAPHIE ; PHOTOGRAPHY ; Physical properties ; Physics, chemistry, biochemistry and biology of agricultural and forest soils ; PROPIEDADES FISICO-QUIMICAS SUELO ; PROPRIETE PHYSICOCHIMIQUE DU SOL ; Q1 ; REMOTE SENSING ; SATELITES ; SATELLITE ; SATELLITE IMAGERY ; SATELLITES ; Sensors ; SOIL CHEMICOPHYSICAL PROPERTIES ; Soil science ; SOIL THERMAL EMISSIVITY ; SOIL THERMAL PROPERTIES ; SOUTH AMERICA ; Structure, texture, density, mechanical behavior. Heat and gas exchanges ; TELEDETECCION ; TELEDETECTION ; Teledetection and vegetation maps ; TEMPERATURA ; TEMPERATURE ; TERRE ; TIERRAS ; VEGETACION ; VEGETATION ; VEGETATION THERMAL EMISSIVITY
É parte de: Remote Sensing of Environment, 1996-09, Vol.57 (3), p.167-184
Notas: P33
F60
U10
9703643
ObjectType-Article-2
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Descrição: Thermal infrared emissivity is an important parameter both for surface characterization and for atmospheric correction methods. Mapping the emissivity from satellite data is therefore a very important question to solve. The main problem is the coupling of the temperature and emissivity effects in the thermal radiances. Several methods have been developed to obtain surface emissivity from satellite data. In this way we propose a theoretical model that relates the emissivity to the NDVI (normalized difference vegetation index) of a given surface and explains the experimental behavior observed by van de Griend and Owe. We can use it to obtain the emissivity in any thermal channel, but in this work we have focused on the 10.5- to 12.5-μm region, where most thermal sensors on board satellites work at present. The model is applicable to areas with several soil and vegetation types and where the vegetation cover changes. From the theoretical model we have developed an operational methodology to obtain the effective emissivity combining satellite images and field measurements. The error of the methodology ranges from 0.5% (due to the experimental limitations of the field methods) to 2% (considering the case in which we have no information about the studied area). To check the general validity of the model, we have validated and applied it in different atmospheric environments and in areas with a different degree of roughness, i.e., from midlatitude (France, Argentina) to tropical (Sahel, Botswana) atmospheres, and from flat (La Mancha, Spain) to rough (Valencia, Spain) surfaces, and we have obtained an error of estimate of 0.6% on the emissivity.
Editor: New York, NY: Elsevier Inc
Idioma: Inglês

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Mapping land surface emissivity from NDVI: Application to European, African, and South American areas

Valor, Enric ; Caselles, Vicente

New York, NY: Elsevier Inc

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