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
description
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. - PowerPoint PPT Presentation
Transcript of Airborne Doppler lidar measurements of the ocean and river surface return
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Airborne Doppler lidar measurements of the ocean and river surface return
Ch. Werner, J. Streicher, O.Reitebuch, E. NagelDLR Institute of Atmospheric Physics
T. Schneiderhan, T. König, S. LehnerDLR Remote Sensing
A.Dabas Meteo France
P. Delville INSU
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WIND flight pattern and ERS-2 box
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SAR grey scale for 42.721 N/6.664 EJuly 4th, 2001, 10.20 UTC
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Wind velocity determined for the SAR scene
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ERS-SAR wind velocity along a line at 35 km
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20.00.0 5.0 10.0 15.0
Wind Speed[m/s] vs. Height
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360.00.0 100.0 200.0
Wind Direction[deg] vs. Height
Wind profile for point 1
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20.0
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Position vs Wind Speed
Wind speed along the flight track(surface layer)
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20.00
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Cursor 0 0.00 27.01 7.54
Horizontal Wind Speed [m/s]
Density plot of wind speed versus the scan number
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360.00
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150.00
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6505
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Wind Direction (Deg)
Density plot of wind direction versus the scan number
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WIND Instrument
Single LOS versus VAD
Ch. Werner, I. Smalikho, J. Streicher, O. ReitebuchDLR Institute of Atmospheric Physics
A. DabasMeteo France
P. DelvilleINSU
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Error of wind velocity estimate E versus the difference between the laser beamdirection and true wind direction ‘ = - v at
U = 1 m/s (a); U = 10 m/s (b); U = 30 m/s; = 5 deg (1); = 10 deg (2); = 20 deg; LOS = 0.1 m/s (dashed curve) and LOS = 1 m/s (solid curves)
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44.6
42.8
43.0
43.2
43.4
43.6
43.8
44.0
44.2
44.4
6.24.2 4.4 4.6 4.8 5.0 5.2 5.4 5.6 5.8 6.0
Flight Path: Latitude vs Longitude
Position of the measurements
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Color plot of the LOS versus pulse number non-scanning (above) and VAD scan (below)
20.0
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LOS [m/s] Height [m]
shot number
30.0
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LOS [m/s]
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20-20 -10 0 10
LOS [m/s] vs. Height [m]
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20.00.0 5.0 10.0 15.0
Wind Speed[m/s] vs. Height
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360.00.0 100.0 200.0
Wind Direction[deg] vs. Height
LOS component 177° (above) versus wind profile (below)
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The estimated wind is about6.5 m/s from 145 degree
This gives about 3.4 m/s LOS for theEstimated 177 degree fixed
LOS measurement
It is proposed to perform a flight with50 km LOS measurements and 150 kmusing VAD scans for an ADM data base
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Proposed WIND flight for ADM LOS (50 km) and VAD (150 km) ERS-SAR or Envisat SAR
track suggested
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Map of the area around Marseille (France) and flight path for the Doppler lidar WIND
with circles showing the laser ground position
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Density plot of the hetorodyne signal, two positions of the cursor are selected
for land return (a) and river return (b)
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50-20 0 20 40
Intensity [dB] vs. Height [m]
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Intensity [dB] vs. Height [m]
Two intensity profiles for the cursor positions a (land) and b (water)
land river
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LOS velocity of the surface layer versus shot number
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Sensitive volume for a cw laser Doppler anemometerat 175 m focussed range from the platform (left)
and mean signals (right) to explain thetwo wind contributions
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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)
