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DLR Oberpfaffenhofen, Remote Sensing Technology Institute
Peter Gege and Stefan PlattnerPeter Gege and Stefan Plattner
MERIS validation activitiesat Lake Constance
MERIS validation activitiesat Lake Constance
MERIS user workshopSession 3: MERIS water products validaton
Frascati, 11.11.2003
MERIS user workshopSession 3: MERIS water products validaton
Frascati, 11.11.2003
DLR Oberpfaffenhofen, Remote Sensing Technology Institute
Lake Constance (Bodensee)Lake Constance (Bodensee)
DLR Oberpfaffenhofen, Remote Sensing Technology Institute
CHRIS-PROBACHRIS-PROBA
DLR Oberpfaffenhofen, Remote Sensing Technology Institute
MERISMERIS
DLR Oberpfaffenhofen, Remote Sensing Technology Institute
Available DataAvailable Data
Parameter Sensor July 11 July 19 Sept. 19Lu (TOA ) MERIS x x xLu (TOA) CHRIS-PROBA x - xLu (1.8, 4.0, 5.4 km) ROSIS - x -Lu (1.8, 4.0 km) HYMAP - x -Ship coordinates GPS x x xLu+, Ed+ ZEISS x x xLu-, Eu-, Ed- RAMSES x x xOD Atmosphere MICROTOPS x x xSPM(x,z) ADCP - - xChl-a, Phao Photometer 2x 2x 1xSPM org., inorg. Balance 2x 2x 1xGelbstoff absorption Dual-beam photom. 2x 2x 1xDetritus absorption Integrating sphere x x xa*(�) Phytoplankton Integrating sphere x x xSecchi depth Secchi disk x x xCTD Multisonde - x xPhoto Digital camera x x x
DLR Oberpfaffenhofen, Remote Sensing Technology Institute
Conditions at MERIS overflightsConditions at MERIS overflights
Rhine station, Sept. 19, 2003, 12:37 h
July 11 July 19 Sept. 19Overflight time (local) 12:25 11:34 12:25Data quality sunglint no L2 dataSun zenith angle (°) 28 35 47MERIS viewing angle (°) 35 34 35Aerosol-OD at 870 nm 0.064 0.054 0.082Angström exponent(Fit for 380, 440, 500, 675, 870 nm)
1.63 1.71 1.52
DLR Oberpfaffenhofen, Remote Sensing Technology Institute
Variability of water constituentsVariability of water constituents
July 11 July 19 Sept. 19Number of stations (2 depths) 8 8 6Secchi depth (m) 2.9 - 4.5 2.0 - 4.7 3.1 - 3.9Chl-a + Phaeo (µg/l) 2.0 - 4.1 2.3 - 3.9 3.2 - 5.3SPM (mg/l) 1.1 - 2.0 1.2 - 3.1 1.4 - 2.0Gelbstoff (m-1 at 440 nm) 0.18 - 0.23 0.22 - 0.27 0.22 - 0.26Gelbstoff S (nm-1) 0.011-0.013 0.011-0.012 0.010-0.012
DLR Oberpfaffenhofen, Remote Sensing Technology Institute
Suspended matterSuspended matter
MERIS L2 FR - Suspended Matter [g/m³]2003/09/19
DLR Oberpfaffenhofen, Remote Sensing Technology Institute
Suspended matterSuspended matter
MERIS L2 FR - Suspended Matter [g/m³]
STATION TSM [g/m³]A 1.83
B1 1.67B2 1.83C 1.67
D1 1.42E 1.83
IN SITU DATA (Depth: 0.5m)
AVG TSM (ROI) SDEV (ROI)1.77 g/m³ 1.56 g/m³
MERIS FR L2
(considered Range: 0.5 - 20 g/m³)
2003/09/19
DLR Oberpfaffenhofen, Remote Sensing Technology Institute
ChlorophyllChlorophyll
MERIS L2 FR - Chlorophyll a [mg/m³]2003/09/19
DLR Oberpfaffenhofen, Remote Sensing Technology Institute
ChlorophyllChlorophyll
MERIS L2 FR - Chlorophyll a [mg/m³]2003/09/19
STATION CLa [mg/m³]A 3.87
B1 3.74B2 4.40C 3.47
D1 2.60E 3.69
IN SITU DATA (Depth: 0.5m)
AVG CLa (ROI) SDEV (ROI)3.64 mg/m³ 1.75 mg/m³
MERIS FR L2
(considered Range: 0.8 - 15 mg/m³)
DLR Oberpfaffenhofen, Remote Sensing Technology Institute
GelbstoffGelbstoff
MERIS L2 FR - Yellow Substance [1/m]2003/09/19
DLR Oberpfaffenhofen, Remote Sensing Technology Institute
GelbstoffGelbstoff
MERIS L2 FR - Yellow Substance [1/m]2003/09/19
STATION YS [1/m]A 0.353
B1 0.241B2 0.234C 0.240
D1 0.241E 0.264
IN SITU DATA (Depth: 1m)
AVG YS (ROI) SDEV (ROI)0.099 /m 0.038 /m
(considered Range: 0.01 - 0.3 /m)
MERIS FR L2
DLR Oberpfaffenhofen, Remote Sensing Technology Institute
Pixel noisePixel noise
MERIS L2 FR - Suspended Matter [g/m³]
MERIS L2 FR - Chlorophyll a [mg/m³]
2003/07/15
DLR Oberpfaffenhofen, Remote Sensing Technology Institute
SPM errorsSPM errors
Aerosol Optical Thickness
Suspended Matter [g/m³]
MERIS L2 FR2003/09/19
Aerosol Epsilon
DLR Oberpfaffenhofen, Remote Sensing Technology Institute
SPM errorsSPM errors
MERIS L2 FR - Suspended Matter [g/m³]2003/04/17
Aerosol Optical Thickness Aerosol Epsilon
DLR Oberpfaffenhofen, Remote Sensing Technology Institute
SPM errorsSPM errors
MERIS L2 FR - Suspended Matter [g/m³]2003/06/14
Aerosol Optical Thickness Aerosol Epsilon
DLR Oberpfaffenhofen, Remote Sensing Technology Institute
Comparison of reflectance spectraComparison of reflectance spectra
400 500 600 700 800Wavelength (nm)
0.00
0.01
0.02
0.03
0.04
Refle
ctan
ce �
Lw /
E d
MERISMERISZEISS above surfaceZEISS above surfaceRAMSES below surfaceRAMSES below surfaceModel fitted to RAMSESModel fitted to RAMSESModel with in-situ dataModel with in-situ data
19.9.2003Station E
ZEISS
RAMSES
DLR Oberpfaffenhofen, Remote Sensing Technology Institute
Comparison of reflectance spectraComparison of reflectance spectra
400 500 600 700 800Wavelength (nm)
0.00
0.01
0.02
0.03
0.04
Refle
ctan
ce �
Lu /
Ed
RAMSES below surfaceRAMSES below surfaceMERISMERIS
400 500 600 700 800Wavelength (nm)
0.00
0.01
0.02
0.03
0.04
Refle
ctan
ce �
Lu /
Ed
ZEISS above surfaceZEISS above surfaceMERISMERIS
19.9.2003, all stations
DLR Oberpfaffenhofen, Remote Sensing Technology Institute
Availability of MERIS-FR dataAvailability of MERIS-FR data
MERIS-FR imagettesESA L1b L2ordered 37 37received 27 30Lake Constance covered 15 13- " - with corrupt bitmasks 14 0- " - water product missing 0 4free of errors 1 9DLR Neustrelitz L1b L2downloaded from ftp site 8 8free of errors 8 8Total L1b L2with corrupt bitmasks 14 0free of errors 9 17
Viewing opportunitiesPeriod 1.1. - 30.9.2003 273full coverage of Lake Constance 164- " - and FR data available 114- " - and good weather conditions 45
DLR Oberpfaffenhofen, Remote Sensing Technology Institute
AcknowledgementAcknowledgement
Andreas Albert, DLR Roland Doerffer, GKSS Kerstin Ebert, DLR Thomas Heege, DLR Danielle Hoja, DLR Stefanie Holzwarth, DLR Harald Krawczyk, DLR Daniela Lipowski, Univ. Konstanz Sabine Miksa, DLR Till Lipowski, Univ. Konstanz Martin Mörtl, Univ. Konstanz Andreas Neumann, DLR Bringfried Pflug, DLR Kurt Sarembe, LfU Paul Schötz, DLR Alfred Sulger, Univ. Konstanz Sabine Thiemann, DLR Michael Weyhmüller, BBW Thomas Wolf, LfU
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