UAV SAR L band (1.6 GHz) ~20cm – In this frequency, insensitive to grain size (Shi & Dozier) –...
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Transcript of UAV SAR L band (1.6 GHz) ~20cm – In this frequency, insensitive to grain size (Shi & Dozier) –...
![Page 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.](https://reader035.fdocuments.in/reader035/viewer/2022062305/5697c0031a28abf838cc3afa/html5/thumbnails/1.jpg)
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
![Page 2: 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.](https://reader035.fdocuments.in/reader035/viewer/2022062305/5697c0031a28abf838cc3afa/html5/thumbnails/2.jpg)
Capacitec Probe
• 16, 32, or 64kHz• Claims to accurately measure snow density
and liquid water content.
![Page 3: 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.](https://reader035.fdocuments.in/reader035/viewer/2022062305/5697c0031a28abf838cc3afa/html5/thumbnails/3.jpg)
Permittivity of ice and water (Stacheder 2005)
Capacitec probe UAV SAR (L-Band)
![Page 4: 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.](https://reader035.fdocuments.in/reader035/viewer/2022062305/5697c0031a28abf838cc3afa/html5/thumbnails/4.jpg)
Permittivity (real) vs density for dry snow (Matzler 1996)
• Around 1GHz• So if we know density
from the probe, can get permittivity
![Page 5: 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.](https://reader035.fdocuments.in/reader035/viewer/2022062305/5697c0031a28abf838cc3afa/html5/thumbnails/5.jpg)
Effect of water content• W is water content• So if we know water content and density, can
get dielectric constants
![Page 6: 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.](https://reader035.fdocuments.in/reader035/viewer/2022062305/5697c0031a28abf838cc3afa/html5/thumbnails/6.jpg)
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)