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Passive microwave measurements of snow-covered forest areas in EMAC'95

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6 Author(s)
N. Kruopis ; Kaunas Univ. of Technol., Lithuania ; J. Praks ; A. Nadir Arslan ; H. M. Alasalmi
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Airborne passive microwave signatures collected in Northern Finland during EMAC-95 are analyzed with the emphasis on forested areas and dry snow conditions. The microwave signatures cover the 6.8-18.7-GHz frequency range and were acquired at both vertical and horizontal polarizations. The analysis is carried out with respect to the forest-stem volume data and comprises three different snow-depth situations. Emissivities approach saturation limit with the increasing stem volume. At 10.65 GHz, the saturation level was found to be linearly related to the snow-water equivalent. On the basis of passive-microwave measurements, an empirical forest transmissivity model is developed. The model is valid at vertical polarization 50° incidence angle, and it accounts for microwave frequency and forest-stem volume effects in the range of 6.8-94 GHz and 0-150 m3/ha, respectively

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IEEE Transactions on Geoscience and Remote Sensing  (Volume:37 ,  Issue: 6 )