کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
4460693 1621344 2007 10 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
A field experiment on microwave forest radiometry: L-band signal behaviour for varying conditions of surface wetness
موضوعات مرتبط
مهندسی و علوم پایه علوم زمین و سیارات کامپیوتر در علوم زمین
پیش نمایش صفحه اول مقاله
A field experiment on microwave forest radiometry: L-band signal behaviour for varying conditions of surface wetness
چکیده انگلیسی

From July–December 2004 the experimental campaign ‘Bray 2004’ was conducted in the coniferous forest of Les Landes near Bordeaux, France, using a multi-angle L-band (1.4 GHz) radiometer to measure from above the forest at horizontal polarization. At the same time, ground measurements were taken of soil and litter moisture content, while precipitation was also permanently monitored. This experiment was done in the context of the upcoming SMOS mission in order to improve our understanding of the behaviour of the L-band signal from forested areas for different wetness conditions and viewing angles. This is especially relevant for solving the problem of heterogeneity since a large fraction of SMOS pixels (∼ 30 × 30 km2) is partially covered by forest.This paper describes the objectives and the overall set-up of the Bray-2004 experiment and shows some first results. The greater part of the horizontally polarized L-band signal is found to be dominated by the influence of physical temperature. Variations in soil and/or litter moisture content are visible in the angular signal and in the above-canopy microwave emission, although the dynamic range of this last effect is very small. This, together with the fact that emissivity values are very high, is possibly due to the presence of a substantial litter layer. However, decoupling of soil and litter effects is difficult because of the strong correlation found between soil and litter moisture.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Remote Sensing of Environment - Volume 109, Issue 1, 12 July 2007, Pages 10–19
نویسندگان
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