CLASSIFICATION OF TYPHOON-DESTROYED FORESTS BASED ON TREE HEIGHT CHANGE DETECTION USING INSAR TECHNOLOGY.ppt

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  • Pi-SAR was developed jointly by NICT (National Information & Communication Agency) and JAXA (Japan Aerospace Exploration Agency), consisting of two X-band radomes and a single L-band radome. the X-band main radome consists of two antennas. The first antenna is used for H-polarization and the second antenna for V-polarization. The sub-radome was not used for the Naruto data collection. The two antennas inside the first radome is separated by d=20cm, and therefore polarimetric interferometric analysis can be made. It is not, however, full Pol-InSAR, because we only have HH1, HV1, and VV2 data.

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  • 1. Classification of Typhoon-Destroyed Forests Based on Tree Height Change Detection Using InSAR Technology IGARSS 2011 Haipeng Wang 1 , Kazuo Ouchi 2 , and Ya-Qiu Jin 1 1. Key Laboratory of Wave Scattering and Remote Sensing Fudan University, P.R. China. 2. Department of Computer Science National Defense Academy of Japan, Japan.
  • 2.
    • The final goal is to establish methodology to estimate the parameters of
    • forests from high-resolution SAR data.
    • This first study we carried out is to quantify the relation between
    • high-resolution polarimetric SAR data and tree biomass of forests.
    • This second one is to extract the information of typhoon-damaged forests.
    • The methodology is to utilize the texture information, polarimetric analysis
    • and interferometric technique.
    • The test site is the Tomakomai forests in Hokkaido, Japan.
    • The SAR data were collected using the airborne Pi-SAR.
    Purpose of T his S tudy
  • 3. Tomakomai National Forests Shikotsu Lake Larch Todo Fir Red Pine Spruce
  • 4. Pi-SAR Pi-SAR ( P olarimetric i nterferometric - SAR ) is an airborne SAR developed jointly by NICT (National Institute of Information and Communications Technology) and JAXA (Japan Aerospace Exploration Agency). It is equipped with two X-band antennas (frequency 9.55 GHz, wavelength 3.14 cm) and a L-band antenna operating at frequency 1.27 GHz (wavelength 23.6 cm). The nominal resolution is 1.5 x 1.5 m at X-band, and 3 x 3 m at L-band for 4-look azimuth multilooking. L-band antenna X-band main antenna X-band sub-antenna
  • 5. Pi-SAR Data JAXA/NICT L-band colour composite polarimetric Pi-SAR image azimuth range study area Shikotsu Lake Tomakomai City Tarumae Mt. study area Data acquired:7 th , November, 2002 Data acquired:3rd, November, 2004 azimuth range
  • 6. Ground-Truth Biomass Data Collection Field measurements were made in 2002, 2003, 2005, and in 2006. Tree species, height, DBH (Diameter at Breast Height), basal area, soil moisture were measured within a 20 x 20 m sample area in each stands, and converted to above-ground biomass using the conversion formula provided by Project department (Stand volume table -East Japan-, Japan Forestry Investigation Committee. Tokyo: Forestry Agency, Oct. 1998)
  • 7. Typhoon Songda Typhoon Songda (Japanese No.18) Duration:August 28 – September 8 Typhoon Songda killed 20 people and injured 700 others in Japan. In addition, 15 crew members of a vessel were reported missing. Damages from the storm amounted to $7.17 billion (2004 USD) Time arrived at Tomakomai: September 7th, 2004
  • 8. Fallen Trees After Typhoon
  • 9. Ground-Truth Data
  • 10. Amplitude Analysis Test sites Whole image Image No. HH HV VV L6407 67.1119 64.3982 66.1515 L8104 66.6437 64.4475 66.7929 L6407-L8104 0.4682 -0.0493 -0.6414 Site No. HH subtraction HV subtraction VV subtraction 196 0.8403 0.6001 -0.2851 197 0.9535 0.5802 -0.2825 198 0.8714 0.3279 -0.5437 217&218 0.8619 0.4444 -0.2188 243 0.8975 0.4549 -0.2435 245 0.9827 0.3009 -0.2797 267 0.9856 0.4899 -0.0584 271 0.8962 0.4392 -0.5062 300 0.8269 0.4759 -0.0099 302 0.7889 0.3169 -0.2331 268 0.6641 0.0218 -0.4429 303 0.5009 -0.0223 -0.6568
  • 11. Amplitude Analysis Results Accuracy:64.1%
  • 12. Scattering Mechanisms From Forests sc attering from crown parts surface scattering from ground multiple reflection betw een ground and tree trunks/branches multiple/volume scattering from branches X/C-bands L/P-bands
  • 13. Three-Component Decomposition Analysis A. Freeman and S. L. Durden, “A three-component scattering model for polarimetric SAR data,” IEEE Trans. Geosci. Remote Sens. , vol. 36, no. 3, pp. 936–973, May 1998. Site No. Double subtraction Volume subtraction Surface subtraction 196 14.1248 1.1277 -22.1597 197 38.2798 1.0917 -39.4679 198 39.1910 0.4771 -34.9405 217&218 35.4332 0.7719 -32.1722 243 37.5858 0.7808 -34.0847 245 37.6906 0.4519 -25.9017 267 37.1895 0.9402 -32.4539 271 28.2527 0.8799 -27.4304 300 31.7851 0.8673 -31.1892 302 35.5875 0.4366 -27.3383 268 32.7751 -0.1122 -17.6746 303 33.6438 -0.2045 -27.5287 Double Volume Surface L6407 102.0232 138.2508 63.4812 L8104 74.4862 138.4537 83.7599 L6407-L8104 27.5449 -0.2026 -20.2847
  • 14. Scattering Mechanism Analysis Result Accuracy:77.7%
  • 15. Pi-SAR L-band antenna X-band main antenna X-band sub-antenna Pi-SAR on Gulf Stream II X-band and L-band radomes Two antennas within X-band main radome Partial Pol-InSAR by X-band main radome (Sub-antenna data not acquired this time)
  • 16. Pi-SAR Data for Interferometric Analysis X-band VM Pi-SAR image Data acquired:3 rd , August, 2004 Data acquired:3rd, November, 2004
  • 17. M , N —— Moving window size S —— Data Complex Interferogram Complex Degree of Coherence
  • 18. Phase Image
  • 19. Removal of Orbital Fringes Court esy of Dr. Moriyama X7904 X8104
  • 20. Phase Unwrapping(X7904)
  • 21. Phase Unwrapping(X8104)
  • 22. Height Change
  • 23. Conclusions and Future Work Research was carried out to extract information of typhoo-damaged forests. The accuracies of 64.1% and 77.7% were obtained for amplitude and decomposition data respectively. InSAR processing resutls show it’s potential, but there is no quantitative results yet. Phase unwrapping: other approaches rather than the branch cut. Difficult to see the difference of typhoon-damaged information from the coherence data before and after the typhoon. Next step is to exam the coherence before and after the typhoon Fusion of optical data and SAR data: QuickBird, IKONOS, Geoeye multispectrum optical data, Pi-SAR I&II data.