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Timestamp: 2019-04-19 18:29:21+00:00

Document:
Determination of snow cover parameters by means of L-band radar differential interferometry. Abstract.
Abstract. An applicability of spaceborne radar interferometry for the measurements of snow layer thickness and snow water equivalent was studied. Experimental dataset in the measurements of thickness and snow water equivalent consisted of two datasets from ALOS PALSAR-2 observations made in snow free conditions and in the presence of snow cover. Theoretical relations between interferometric phase difference, snow layer thickness and snow water equivalent for a given observation geometry and radar signal wavelength are presented. An essential feature of the experiment was the deployment at the test field of the reference corner reflector having stable level of radar cross section and scattered signal phase center location. Its interferometric phase difference was used as reference in calculations of the phase differences induced by snow cover on the test field. The deployment of the corner reflector with 2 meters leg on the smooth surface of the test field provided high corner signal to surrounding clutter ratio, exceeding 34 dB, and respective accurate measurements of the corner signal phase difference. At the same time, overall accuracy is determined by signals of the test field covered with snow layer. Direct measurements of snow parameters are: snow thickness 20 � 30 cm, snow density 0.2 � 0.21 g/cm3. The calculations of snow depth made using theoretical relations, interferometric phase difference measurements, as well as direct measurements of snow layer thickness at the test field are in good agreement.
Key words: Spaceborne synthetic aperture radar, differential interferometry, ALOS PALSAR-2, snow cover, snow water equivalent.
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