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Sökning: WFRF:(Hallberg Björn 1973)

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  • Eriksson, Leif, 1970, et al. (författare)
  • ALOS PALSAR Calibration and Validation Results from Sweden
  • 2007
  • Ingår i: IEEE Geoscience and Remote Sensing Symposium (IGARSS 2007), Barcelona, Spain, July 23-27, 2007. ; DOI: 10.1109/IGARSS.2007.4423115, s. 1589-1592
  • Konferensbidrag (övrigt vetenskapligt/konstnärligt)abstract
    • In 2006 calibration activities for ALOS PALSAR wereconducted in Sweden. Four five-metre trihedral corner reflectorsand three smaller dihedral reflectors were deployed and operatedduring eight months. 23 PALSAR scenes were acquired over thecalibration site allowing an evaluation of the quality and temporalstability of the data. Results show that the co-polarized datahave been stable during the whole calibration period with variationsin the trihedral responses lower than 0.7 dB. The measuredresolution in azimuth was 4.4 m and in slant range 4.7 m forsingle polarization images and 9.5 m for polarimetric data. Forthe cross-polarized data large variations in the dihedral responseswere found. It is assumed that this is caused by a larger sensitivityto pointing errors. For the polarimetric data, estimation ofFaraday rotation gave values ranging from 0.1º to 3º.
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  • Fransson, J.E.S., et al. (författare)
  • Mapping of Wind-Thrown Forests Using VHF/UHF SAR Images
  • 2007
  • Ingår i: IEEE 2007 International Geoscience and Remote Sensing Symposium (IGARSS 2007), Barcelona, Spain, July 23-27 2007. ; DOI: 10.1109/IGARSS.2007.4423313, s. 2350-2353
  • Konferensbidrag (övrigt vetenskapligt/konstnärligt)abstract
    • SAR images from the Swedish airborne CARABAS-II and LORA systems have been visually analyzed over simulated wind-thrown forest at both single tree and stand level. In ideal conditions, the results show that LORA is more accurate than CARABAS-II at detecting wind-thrown trees, regardless of tree size and direction of the fallen trees relative to flight heading. Furthermore, the visible single trees in the LORA images appeared more distinct than in the CARABAS-II images, which could be explained by the high resolution in the LORA images. Based on visual interpretation, it is likely that the detection of wind-thrown forests could be improved using VHF/UHF SAR images acquired both prior to and after a storm event.
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  • Hallberg, Björn, 1973, et al. (författare)
  • Measurements at tree level using CARABAS-II
  • 2005
  • Ingår i: Forestsat 2005 / Olsson, H.. - 1100-0295. ; A, s. 54-58
  • Konferensbidrag (övrigt vetenskapligt/konstnärligt)
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  • Resultat 1-10 av 22

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