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Airborne Doppler lidar measurements of the ocean and river surface return

Airborne Doppler lidar measurements of the ocean and river surface return Ch. Werner, J. Streicher, O.Reitebuch, E. Nagel DLR Institute of Atmospheric Physics T. Schneiderhan, T. König, S. Lehner DLR Remote Sensing A.Dabas Meteo France P. Delville INSU.

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Airborne Doppler lidar measurements of the ocean and river surface return

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  1. Airborne Doppler lidar measurements of the ocean and river surface return Ch. Werner, J. Streicher, O.Reitebuch, E. Nagel DLR Institute of Atmospheric Physics T. Schneiderhan, T. König, S. Lehner DLR Remote Sensing A.Dabas Meteo France P. Delville INSU

  2. WIND flight pattern and ERS-2 box 26 1

  3. SAR grey scale for 42.721 N/6.664 E July 4th, 2001, 10.20 UTC

  4. Wind velocity determined for the SAR scene

  5. ERS-SAR wind velocity along a line at 35 km

  6. Wind profile for point 1

  7. Wind speed along the flight track (surface layer)

  8. Density plot of wind speed versus the scan number

  9. Density plot of wind direction versus the scan number

  10. WIND Instrument Single LOS versus VAD Ch. Werner, I. Smalikho, J. Streicher, O. Reitebuch DLR Institute of Atmospheric Physics A. Dabas Meteo France P. Delville INSU

  11. Error of wind velocity estimate E versus the difference between the laser beam direction and true wind direction‘ = q- qv at U = 1 m/s (a); U = 10 m/s (b); U = 30 m/s; d = 5 deg (1);d= 10 deg (2); d = 20 deg; sLOS = 0.1 m/s (dashed curve) andsLOS = 1 m/s (solid curves)

  12. Position of the measurements

  13. Color plot of the LOS versus pulse number non-scanning (above) and VAD scan (below)

  14. LOS component 177° (above) versus wind profile (below)

  15. The estimated wind is about 6.5 m/s from 145 degree This gives about 3.4 m/s LOS for the Estimated 177 degree fixed LOS measurement It is proposed to perform a flight with 50 km LOS measurements and 150 km using VAD scans for an ADM data base

  16. Proposed WIND flight for ADM LOS (50 km) and VAD (150 km) ERS-SAR or Envisat SAR track suggested

  17. Map of the area around Marseille (France) and flight path for the Doppler lidar WIND with circles showing the laser ground position

  18. Density plot of the hetorodyne signal, two positions of the cursor are selected for land return (a) and river return (b)

  19. Two intensity profiles for the cursor positions a (land) and b (water) land river

  20. LOS velocity of the surface layer versus shot number

  21. Sensitive volume for a cw laser Doppler anemometer at 175 m focussed range from the platform (left) and mean signals (right) to explain the two wind contributions

  22. Computer printout of the continuous recording of the LOS wind component (4 seconds) at a range of 175 m and water surface height (against the wind)

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