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Signatures of Forest Radar Images at VHF-band. BioGeoSAR07 Overview Airborne SAR system IMARK Simultaneous radar and ground-based forest measurements.

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Presentation on theme: "Signatures of Forest Radar Images at VHF-band. BioGeoSAR07 Overview Airborne SAR system IMARK Simultaneous radar and ground-based forest measurements."— Presentation transcript:

1 Signatures of Forest Radar Images at VHF-band

2 BioGeoSAR07 Overview Airborne SAR system IMARK Simultaneous radar and ground-based forest measurements GPR sensing Dependencies of backscattered signal on forest parameters Conclusions

3 BioGeoSAR07 Airborne SAR Complex IMARK

4 BioGeoSAR07 Disposition of the Antennas on the Plane

5 BioGeoSAR07 Main Features of the IMARK SAR Complex ParameterValue FrequencyXLPVHF Wavelength, cm PolarizationVV, HH, VH, HV Resolution, m Antennas: gain, dB Width in azimuth, deg Width in elevation, deg24 60

6 BioGeoSAR07 Images Obtained by SAR System IMARK L-bandP-bandVHF-band Spas-Klepiki, Ryazanskaya Region

7 BioGeoSAR07 The process of boring for the sampling of soil and the appearance of soil samples taken from different depths

8 BioGeoSAR07

9 Use of GPR for carrying out investigations on permittivity fluctuations in subsurface soil layers

10 BioGeoSAR07 The examples of GPR measurements in particular points

11 BioGeoSAR07 Theoretical estimation of backscattering from forest stand Typical scattering mechanisms Scattering from array of cylinders with height distribution

12 BioGeoSAR07 Scattering from layered medium with spatially inhomogeneous dielectric permittivity Case 1: Layer 2 without large inhomogeneities Case 2: Layer 2 with large inhomogeneities (root system) Three layers: layers 1, 2 are inhomogeneous, layer 3 is homogeneous. Correlation function of dielectric permittivity:

13 BioGeoSAR07 Experimental dependencies of backscattered signal on stem diameter and distance between trees

14 BioGeoSAR07 Experimental dependencies of backscattered signal on tree height and biomass

15 BioGeoSAR07 Conclusions Backscatter from forest at VHF band at HH polarization increases with the growth of biomass and tree diameter Measurements conducted by ground penetrating radar confirm spatial variation of dielectric constant of the upper subsurface soil layer of forest Large fluctuations of dielectric permittivity of the upper soil layer related with the presence of tree root system have significant importance in the formation of backscatter from forestland Measurements conducted in different periods of time indicate the seasonal variation of backscatter from coniferous forest


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