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

• Main Authors: Kruopis, Nerijus, Praks, Jaan, Arslan, Ali Nadir, Alasalmi, Hanna M., Koskinen, Jarkko T., Hallikainen, Martti T.
• Format: Article in Journal/Newspaper
• Language: English
• Published: 1999
• Subjects: Northern Finland
• Online Access: http://ktu.lvb.lt/KTU:ELABAPDB2854097&prefLang=en_US

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.