COMPARISON OF SINGLE AND DUAL POLARIZED ENVISAT ASAR DATA WITH LASER SCANNNER DATA OF SEA ICE FREEBOARD IN FRAM STRAIT

In this project we have produced co-registered datasets of laser scanner and ENVISAT ASAR AP data. A comparison of ENVISAT ASAR Alternate Polarization (AP) mode (HH+VV) backscatter coefficient values and polarization ratios with ice freeboard height measured with the KMS laser scanner is made. The C...

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Bibliographic Details
Main Authors: Leif Toudal, Kjell Kloster, Sine Munk Hvidegaard, Kristian Keller, Rene Forsberg
Other Authors: The Pennsylvania State University CiteSeerX Archives
Format: Text
Language:English
Published: 2003
Subjects:
Asar
Bergen
Fram Strait
Sea ice
Online Access:http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.380.884
http://earth.esa.int/workshops/salzburg04/papers_posters/4C5_toudal_626.pdf
Description
Summary:In this project we have produced co-registered datasets of laser scanner and ENVISAT ASAR AP data. A comparison of ENVISAT ASAR Alternate Polarization (AP) mode (HH+VV) backscatter coefficient values and polarization ratios with ice freeboard height measured with the KMS laser scanner is made. The CRYOVEX-2003 dataset of 11 April 2003 was used here. The laser scanner data and the ASAR AP data were collected with a time difference of less than 1 hour. The dataset contains many wide and clear thin ice areas between large multi-year ice floes. The main result of the comparison is that a rough relation between the ASAR signal and the laser freeboard measurements is found. Sensing Center (NERSC) in Bergen and georeferenced quick-looks were transmitted to the field crews. The ESA EOLI server [1] was used as a supplemental source of low resolution near real time data. The data were geocoded using the given corner coordinates and some ground control points. The resolution of the EOLI quick-looks were rather coarse, but for transmission through low bandwidth satellite telephone connections they still provided useful information. The corner coordinates given for the scenes were found to be of very low quality, and the use of ground control points were found to be essential. The EOLI data were used as a substitute for ASAR Global Monitoring data that had not yet become available at the time. Coordinates given for the EOLI scenes as well as those for the real time WS data were found to be of very low quality. 1.

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