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UAV SAR

UAV SAR. L band (1.6 GHz) ~20cm In this frequency, insensitive to grain size (Shi & Dozier) Sensitive to density, liquid water content Need dielectric constants. Capacitec Probe. 16, 32, or 64kHz Claims to accurately measure snow density and liquid water content.

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UAV SAR

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  1. UAV SAR • L band (1.6 GHz) ~20cm • In this frequency, insensitive to grain size (Shi & Dozier) • Sensitive to density, liquid water content • Need dielectric constants

  2. Capacitec Probe • 16, 32, or 64kHz • Claims to accurately measure snow density and liquid water content.

  3. Permittivity of ice and water (Stacheder 2005) Capacitec probe UAV SAR (L-Band)

  4. Permittivity (real) vs density for dry snow (Matzler 1996) • Around 1GHz • So if we know density from the probe, can get permittivity

  5. Effect of water content • W is water content • So if we know water content and density, can get dielectric constants

  6. Permanent dataloggers at GPS stations • Use soil moisture probes to measure dielectric constants of snow and log for 2 weeks? • These are RF capacitance probes, but unclear if can get more than just moisture (need density also)

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