volume | PIER Journals

Abstract

Observations of L- and C-band backscatter from snow cover are presented at all polarizations. Airborne passive-microwave data was collected in Northern Finland during EMAC'95 (European Multi-sensor Airborne Campaign-95). The measurements cover the 6.8-18.7 GHz frequency range with both verticaland horizontal polarizations. The empirical SAR data were acquired by EMISAR of TechnicalUniv ersity of Denmark over the city of Oulu in Northern Finland during EMAC'95. Airborne measurements were conducted on 22-23 March, and on 2-3 May 1995. The land-use map of the test sites was obtained from the NationalLand Survey of Finland. This study combines the semi-empirical and empirical models that were developed. Applicability of the forest transmissivity formulas developed by using the different data sets of passive and active sensors is shown. Because of the effect of dry snow at C-band is more visible than at L-band. A C-band semi-empiricalbac kscattering modelis developed for the forest-snow-ground system.

1. Shi, J. and J. Dozier, "Estimation of snow water equivalence using SIR-C/X-SAR, Part I: Inferring snow density and subsurface properties," IEEE Trans. Geosci. Remote Sensing, Vol. 38, No. 6, 2465-2474, 2000.
doi:10.1109/36.885195 Google Scholar

2. Shi, J. and J. Dozier, "Estimation of snow water equivalence using SIR-C/X-SAR, Part II: Inferring snow depth and particle size," IEEE Trans. Geosci. Remote Sensing, Vol. 38, No. 6, 2475-2488, 2000.
doi:10.1109/36.885196 Google Scholar

3. Kendra, J. R., K. Sarabandi, and F. T. Ulaby, "Radar measurements of snow: experiment and analysis," IEEE Trans. Geosci. Remote Sensing, Vol. 36, No. 4, 864-879, 1998.
doi:10.1109/36.673679 Google Scholar

4. Bernier, M. and J. P. Fortin, "The potentialof time series of C-band SAR data to monitor dry and shallow snow cover," IEEE Trans. Geosci. Remote Sensing, Vol. 36, No. 1, 226-243, 1998.
doi:10.1109/36.655332 Google Scholar

5. Strozzi, T., A. Wiesmann, and C. Mätzler, "Active microwave signatures of snow covers at 5.3 and 35 GHz," Radio Science, Vol. 32, No. 2, 479-495, 1997.
doi:10.1029/96RS03777 Google Scholar

6. Koskinen, J., J. Pulliainen, and M. Hallikainen, "The use of ERS-1 SAR data in snow melt monitoring," IEEE Trans. Geosci. Remote Sensing, Vol. 35, No. 3, 601-610, 1997.
doi:10.1109/36.581975 Google Scholar

7. Shi, J. and J. Dozier, "Estimation of snow water equivalence using SIR-C/X-SAR," Proceedings of IGARSS'96, Vol. 4, 2002-2004, 1996. Google Scholar

8. Shi, J. and J. Dozier, "Inferring snow wetness using C-band data from SIR-C's polarimetric synthetic aperture radar," IEEE Trans. Geosci. Remote Sensing, Vol. 33, No. 4, 905-914, 1995.
doi:10.1109/36.406676 Google Scholar

9. Rott, H. and T. Nagler, "Capabilities of ERS1-SAR for snow and glacier monitoring in alpine region," Proceedings of the Second ERS-1 Symposium, 965-970, 1993. Google Scholar

10. Mätzler, C. and E. Schanda, "Snow mapping with active microwave sensors," International Journal of Remote Sensing, Vol. 15, No. 2, 409-422, 1983. Google Scholar

11. Stiles, W. H. and F. T. Ulaby, "The active and passive microwave response to snow parameters, 1, wetness," J. Geophys. Res., Vol. 85, 1037-1044, 1980. Google Scholar

12. Ulaby, F. T. and W. H. Stiles, "The active and passive microwave response to snow parameters, 1, water equivalent of dry snow," J. Geophys. Res., Vol. 85, 1045-1049, 1980. Google Scholar

13. Dobson, M. C., F. T. Ulaby, T. Le Toan, A. Beaudoin, E. S. Kasischke, and N. Christensen, "Dependence of radar backscatter on coniferous biomass," IEEE Trans. Geosci. Remote Sensing, Vol. 30, No. 2, 412-415, 1992.
doi:10.1109/36.134090 Google Scholar

14. Durden, S. L., J. J. Van Zyl, and H. A. Zebker, "Modeling and observation of the radar polarization signature of forested areas," IEEE Trans. Geosci. Remote Sensing, Vol. 27, No. 3, 290-301, 1989.
doi:10.1109/36.17670 Google Scholar

15. Le Toan, T., A. Beaudoin, J. Riom, and D. Guyon, "Relating forest biomass to SAR data," IEEE Trans. Geosci. Remote Sensing., Vol. 30, No. 2, 403-411, 1992.
doi:10.1109/36.134089 Google Scholar

16. Ulaby, F. T., K. Sarabandi, K. McDonald, M. Whitt, and M. C. Dobson, "Michigan microwave scattering model," Int. J. Remote Sensing, Vol. 11, No. 7, 1223-1253, 1990. Google Scholar

17. Pulliainen, J., "Investigation on the backscattering properties of finnish borealforests at C-and X-band: Semi-empirical modeling approach," Doctor of Technology Thesis, 1994. Google Scholar

18. Pulliainen, J., K. Heiska, J. Hyyppä, and M. Hallikainen, "Backscattering properties of borealforests at C- and X-band," IEEE Trans. Geosci. Remote Sensing, Vol. 32, No. 5, 1041-1050, 1994.
doi:10.1109/36.312892 Google Scholar

19. Hallikainen, M., J. Koskinen, J. Praks, A. N. Arslan, H. Alasalmi, and P. Makkonen, "Mapping of snow with airborne microwave sensors in EMAC'95," Proc. EMAC Final Workshop, 143-153, 1997. Google Scholar

20. Kruopis, N., J. Praks, A. N. Arslan, H. Alasalmi, J. Koskinen, and M. Hallikainen, "Passive microwave measurements of snowcovered forest areas in EMAC'95," IEEE Trans. Geosci. Remote Sensing, Vol. 37, No. 11, 2699-2705, 1999.
doi:10.1109/36.803417 Google Scholar

21. Christensen, E. L., N. Skou, J. Dall, K. W. Woelders, J. H. Jorgensen, J. Granholm, and S. N. Madsen, "MISAR: An absolutely calibrated polarimetric L- and C-band SAR," IEEE Trans. Geosci. Remote Sensing, Vol. 36, No. 6, 1852-1865, 1998.
doi:10.1109/36.729356 Google Scholar

22. Pulliainen, J., L. Kurvonen, and M. Hallikainen, "Multi-temporal behavior of L- and C-band SAR observations of borealforest," IEEE Trans. Geosci. Remote Sensing, Vol. 37, 927-937, 1999.
doi:10.1109/36.752211 Google Scholar

23. Pulliainen, J., P. Mikkelä, and M. Hallikainen, "Seasonal dynamics of C-band backscatter of borealforests with applications to biomass and soilmoisture estimation," IEEE Trans. Geosci. Remote Sensing, Vol. 34, No. 5, 758-770, 1996.
doi:10.1109/36.499781 Google Scholar

24. Pulliainen, J., M. Engdahl, and M. Hallikainen, "Feasibility of multi-temporal interferometric SAR data for stand-level estimation of borealforest stem volume," Remote Sensing of Environment, Vol. 85, 397-409, 2003.
doi:10.1016/S0034-4257(03)00016-6 Google Scholar

25. Arslan, A. N., J. Koskinen, J. Praks, H. Alasalmi, N. Kruopis, and M. Hallikainen, "Retrieving snow water equivalence on C-and Lband SAR data for dry snow," Proceedings of IGARSS'98, Vol. 4, 1870-1872, 1998. Google Scholar

26. Arslan, A. N., J. Praks, J. Koskinen, and M. Hallikainen, "An empiricalmo delfor retrieving water equivalent of dry snow from C-band SAR data," Proceedings of IGARSS'99, Vol. 3, 1789-1791, 1999. Google Scholar

27. Arslan, A. N., H. Wang, J. Pulliainen, and M. Hallikainen, "Effective permittivity of wet snow using strong fluctuation theory," Journal of Electromagnetic Waves and Applications, Vol. 15, 53-55, 2001. Google Scholar

28. Arslan, A. N., H. Wang, J. Pulliainen, and M. Hallikainen, "Scattering from wet snow by applying strong fluctuation theory," Journal of Electromagnetic Waves and Applications, Vol. 17, 1009-1024, 2003.
doi:10.1163/156939303322519081 Google Scholar

Dr. Ali Arslan

Professor Jouni Pulliainen

Dr. Martti Hallikainen