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Sökning: AMNE:(TECHNOLOGY Other technology Space engineering) > Fransson J E S

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1.
  • Eriksson, Leif E.B., 1970-, et al. (författare)
  • Stem volume estimation for boreal forest using ALOS PALSAR
  • 2007
  • Ingår i: 5th International Symposium on Retrieval of Bio- and Geophysical Parameters from SAR Data for Land Applications, Bari, Italy, September 25-28, 2007, ESA, Istituto di Studi sui Sistemi Intelligenti per l´Automazione.
  • Konferensbidrag (övrigt vetenskapligt)
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2.
  • Eriksson, Leif E.B., 1970-, et al. (författare)
  • ALOS PALSAR calibration and validation activities in Sweden
  • 2008
  • Ingår i: Proceedings of The First Joint PI Symposium of ALOS Data Nodes for ALOS Science Program in Kyoto, Kyoto, Japan, 19 - 23 November, 2007. - 1349-113X. - 978-4-906653-04-1 ; JAXA-SP-07-012
  • Konferensbidrag (övrigt vetenskapligt)
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3.
  • Eriksson, Leif E.B., 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)
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  • Pantze, Andreas, et al. (författare)
  • Mapping and monitoring clear-cuts in Swedish forest using ALOS PALSAR satellite images
  • 2009
  • Ingår i: Proceedings of IGARSS 2009 Symposium, Earth Observation – Origins to Applications, Cape Town, South Africa, 13-17 July, 2009. - 978-1-4244-3395-7 ; III, s. 589-592
  • Konferensbidrag (övrigt vetenskapligt)abstract
    • This study presents results for observing forest changes in Sweden using multi-temporal L-band satellite data and is a part of the JAXA's ALOS Kyoto and Carbon Initiative. An extensive dataset of images acquired by the Advanced Land Observing Satellite Phased Array type L-band Synthetic Aperture Radar (ALOS PALSAR) is investigated for clear-cut detection in boreal forests in northern Sweden (Lat. 64 degrees 14' N, Long. 19 degrees 50' E). Strong forest/non-forest contrast and temporal consistency were found for the Fine Beam Dual HV-polarized backscatter during unfrozen conditions. Thus, a simple thresholding algorithm that exploits the temporal consistency of pair-wise HV-backscatter measurements has been developed for clear-cut detection. When applied to an image pair acquired during favorable weather conditions, the detection algorithm identified 76% of the clear-cut pixels within a reference layer, with zero erroneously detected pixels. With further refinement the developed methodology can be an option to present operational alternatives for clear-cut detection.
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  • Santoro, M, et al. (författare)
  • Signatures of ALOS PALSAR L-Band Backscatter in Swedish Forest
  • 2009
  • Ingår i: IEEE Transactions on Geoscience and Remote Sensing. - 0196-2892. ; 47:12, s. 4001-4019
  • Tidskriftsartikel (refereegranskat)abstract
    • The Phased Array type L-band Synthetic Aperture Radar onboard the Advanced Land Observing Satellite has, since its launch, been acquiring an extensive data set of images over two forest test sites in Sweden. The sites of Remningstorp (Lat. 58 degrees 30' N, Long. 13 degrees 40' E) in the south and Krycklan (Lat. 64 degrees 14' N, Long. 19 degrees 50' E) in the north of Sweden are characterized by hemiboreal and boreal forests, respectively. In this paper, we have investigated the signatures of standwise backscatter measurements from forests with different growth stages in relation to polarization, environmental conditions, image viewing geometry, and spatial resolution. The HV backscatter presented stronger sensitivity to the forest growth stage than the HH and VV backscatter. Under unfrozen conditions, the dynamic range of fine-beam data acquired at 34.3 degrees was 8-9 dB for the HV polarization and 6-7 dB for the HH polarization. At 21.5 degrees, in the polarimetric mode, the dynamic range was 6, 7, and 9 dB at VV, HH, and HV polarizations, respectively. Regardless of the specific polarization, the backscatter was temporally consistent under unfrozen conditions, with a small increase of backscatter in regrowing young forest for wet conditions. Under thawing and frozen conditions, repeated measurements were available only for the HH backscatter at 34.3 degrees. For thawing conditions, the backscatter level was similar to the unfrozen conditions even though the signatures differed depending on temperature dynamics, snow-cover properties, and precipitation. Under frozen conditions, the signatures varied depending on temperature. For images acquired when the temperature was well below the freezing point, the backscatter was low, and the dynamic range was small (2-4 dB); nonetheless, the measurements were consistent. Images acquired when temperature was close to the freezing point presented a behavior similar to unfrozen conditions. The sensitivity of the backscatter to the image viewing geometry for different growth stages was studied for data acquired under dry unfrozen conditions. The backscatter difference increased for increasing look angle because of the increase in volume scattering and the decrease of ground-surface backscatter. The largest difference was observed at 41.5 degrees with 2.5-4-dB difference for the HH and 4-5-dB difference for the HV case. Loss of spatial resolution (20-50 m) did not have any effect on the backscatter signatures in Krycklan, whereas in Remningstorp, the smallest stands were affected.
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