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Development ocean color remote sensing in China in 2002
Pan Delu He Xinqing etc.
(潘德炉、何贤强等)(Second Institute of Oceanography, SOA)
Hangzhou, 310012, [email protected]
1 、 SZ-3 spaceship2 、 HY-1/COCTS3 、 What plan in 20034 、 Conclusion
Development ocean color remote sensing in China in 2002
2
Satellite programs for marine remote sensing in China
1988 1990 1999 2002 2004 2005
FY-1A FY-1B FY-1C FY-1D FY- 3
HY-1A HY-1B FY- 2
SZ-3
Visitable and near inf
erred
Sort inferred
Far inferred
WavelengthRange
(um)
0.403~0.803
0.843~1.028
2.15~ 2.25 8.4~ 8.910.3~ 11.311.5~ 12.5
Channels 20+ 10 1 1 2
Wavelength 20nm 0.1m 0.5m 1m
S/N ≥250 ≥200 ≤0.4 ≤0.3
Spatial res. 500m
FOV 44( 400km)
Data rate 7.2 Mbps
机械制冷机工作温度 : 85K
Main characters of CMODIS
Test area 1 Yellow Sea 黄海测区
共完成 24个站位的表面、水中光学特性,场区上空大气光学特性,以及气象与其它海洋物理观测量等很有价值的数据。
滩涂测区
嵊泗花乌测区1
2
34
5
东海地面配合试验测区分布
海洋二所卫星中心
海洋三所
Test area 2
East China Sea
Test area 3 South China Sea ( 南海测区 )
Jun,2-7
40 station
54M data
在 6 月 2 日 -7 月 2 日期间共进行 40 站位测量, 54M 数据量
Satellite data to be used for comparing and crossing calibration 用于比较的卫星资料
SeaWiFS
MODIS
AVHRR
FY-1D
星与星对比测量SeaWiFS
FOV
交叉定标法( Cross-Calibration )
利用 SeaWiFS 进行 921CMODIS 评价和定标的图径
星 - 星对比的过程图交叉定标法( Cross-
Calibration )SeaWiFS received radiance
Water leaving radiance
Type of aerosol, optic
al thinkness ththickness
Atmospheric transmittance
CMODIS geometry in stead of SeaWiFS geometry
Water leaving radiance
Aerosol radiance
Atmospheric transmittanc
CMODIS simulated radiance
SeaWiFSGeometry
CMODISGeomery
CMODIS received radiance
CMODIS calibration coefficient
四个定标区域 CMODIS 接收的原始辐亮度和利用 SeaWiFS 反推得到的 CMODIS
Atmospheric correction
Rayleighradiance
CMODS
6\2 14:17
SeaWiFS
6/2 12:00
Comparing the top radiance of CMODIS to SeaWiFS 接收总能量的比较
FOV
CMODISSeaWiFS
FOV
Comparing the top radiance of CMODIS to SeaWiFS 接收总能量的比较
area SeaWiFS 数据时间 CMODIS 数据时间 Longitude Latitude
1 2002/06/02/T12 : 00 2002/06/02/T14 : 17 :00
123.15o 38.85o
2 2002/06/03/T12 : 00 2002/06/03/T14 : 17 :00
128.25o 31.50o
3 2002/06/07/T12 : 00 2002/06/07/T12 : 03 :55
123.94o 27.43o
4 2002/06/07/T12 : 00 2002/06/07/T12 : 03 :55
120.13o 31.21o
Crossing-calibration data
星 - 星定标采用的数据
400 450 500 550 600 650 700 750 8000
1
2
3
4
5
6
7
8
9ÇøÓò1
CMODISÔ Ê¼·øÁÁ¶È CMODIS·́ ÍÆ·øÁÁ¶È
·øÁ
Á¶È
(mW
/cm2 um
Sr)
²¨³¤(nm)
400 450 500 550 600 650 700 750 8000
2
4
6
8
10
12ÇøÓò2
·øÁ
Á¶È
(mW
/cm2 um
Sr)
²¨³¤(nm)
CMODISÔ Ê¼·øÁÁ¶È CMODIS·́ ÍÆ·øÁÁ¶È
400 450 500 550 600 650 700 750 8000
2
4
6
8
10
12
·øÁ
Á¶È
(mW
/cm2 um
Sr)
²¨³¤(nm)
ÇøÓò3 CMODISÔ Ê¼·øÁÁ¶È CMODIS·́ ÍÆ·øÁÁ¶È
400 450 500 550 600 650 700 750 800
6
8
10
12
14
16
18
²¨³¤(nm)
·øÁ
Á¶È
(mW
/cm2 um
Sr)
ÇøÓò4 CMODISÔ Ê¼·øÁÁ¶È CMODIS·́ ÍÆ·øÁÁ¶È
Comparing water radiance of SEAWIFS and CMODIS 离水辐射率对比
8 9 10 11 12 13 14 15
6
7
8
9
10
11
12
13
Band 413
CM
OD
IS·´
ÍÆ·ø
ÁÁ
¶È(m
W/c
m2 umS
r)
CMODISÔ Ê¼·øÁÁ¶È(mW/cm2umSr)
7 8 9 10 11 12 13 145
6
7
8
9
10
11
12
13Band 433
CM
OD
IS·́
ÍÆ·ø
ÁÁ
¶È(m
W/c
m2 umS
r)
CMODISÔ Ê¼·øÁÁ¶È(mW/cm2umSr)
6 8 10 12 14 16
5
6
7
8
9
10
11
12
13
14
CMODISÔ Ê¼·øÁÁ¶È(mW/cm2umSr)
CM
OD
IS·´
ÍÆ·ø
ÁÁ
¶È(m
W/c
m2 um
Sr)
Band 453
8 10 12 14 16 184
6
8
10
12
14
CM
OD
IS·´
ÍÆ·ø
ÁÁ
¶È(m
W/c
m2 umS
r)
CMODISÔ Ê¼·øÁÁ¶È(mW/cm2umSr)
Band 473
6 8 10 12 14 16
4
6
8
10
12
14
CMODISÔ Ê¼·øÁÁ¶È(mW/cm2umSr)
CM
OD
IS·́
ÍÆ·ø
ÁÁ
¶È(m
W/c
m2 umS
r)
Band 493
6 8 10 12 14 162
4
6
8
10
12
14
CMODISÔ Ê¼·øÁÁ¶È(mW/cm2umSr)
CM
OD
IS·́
ÍÆ·ø
ÁÁ
¶È(m
W/c
m2 umS
r)
Band 513
4 6 8 10 12 142
4
6
8
10
12
CM
OD
IS·´
ÍÆ·ø
ÁÁ
¶È(m
W/c
m2 um
Sr)
CMODISÔ Ê¼·øÁÁ¶È(mW/cm2umSr)
Band 533
4 6 8 10 12 14
2
4
6
8
10
12
CMODISÔ Ê¼·øÁÁ¶È(mW/cm2umSr)
CM
OD
IS·´
ÍÆ·ø
ÁÁ
¶È(m
W/c
m2 umS
r)
Band 553
4 6 8 10 12
2
4
6
8
10
12
CMODISÔ Ê¼·øÁÁ¶È(mW/cm2umSr)
CM
OD
IS·́
ÍÆ·ø
ÁÁ
¶È(m
W/c
m2 umS
r)
Band 593
交叉定标系数的确定 L©=a+b.L(s)+c.L2(s)
CMODIS data atmospheric correction 数据大气校正技术
Lt = Lr + (La + Lra) + tLwc + TLg + t Lw
CMODIS 总辐亮度 Lt 大气参数(气压、臭氧浓度、海面风速,湿度等)
瑞利散射计算
气溶胶散射计算
大气透过率计算
离水辐亮度
归一化离水辐亮度
图 2 CMODIS 大气校正流程
Water leaving radiance 大气校正后的结果
CMODIS 493 SEAWIS 490
Comparing the water leaving radiance of MODIS and SeaWiFS after atmospheric correction
大气校正后的结果比较
与实测的结果比较
400 450 500 550 600 650 700 7500
1
2
3
4
5
6
7 ʵ²â ¶¨±êºó Ô Ê¼
¹éÒ
»»
¯À
ëË
®·ø
ÁÁ
¶È(m
W/c
m2 /u
m/S
r)
²¨³¤(nm)
400 500 600 700 800 900 10000.0
0.5
1.0
1.5
2.0
2.5
3.0
3.5
4.0
4.5
5.0
5.5
6.0
6.5
L平均实测wn
CMODI S L反 演wn
¹éÒ
»»¯À
ëË®
·øÁ
Á¶È
(mW
/cm
2 umS
r)
²¨³¤(nm)
由 CMODIS 得到的连续光谱与实测光谱的比较
信息提取和应用 - 像谱合一光谱
400 500 600 700 800 900 10000.0
0.5
1.0
1.5
2.0
2.5
3.0
3.5
4.0
4.5
5.0
5.5
6.0
6.5
L平均实测wn
CMODI S L反 演wn
¹éÒ
»»¯À
ëË®
·øÁ
Á¶È
(mW
/cm
2 umS
r)
²¨³¤(nm)
400 500 600 700 800 900 10000.0
0.5
1.0
1.5
2.0
2.5
3.0
3.5
4.0
4.5
5.0
5.5
6.0
6.5 1站位
2站位
3站位
4站位
5站位
6站位
(mW/cm
归一
化离
水辐
亮度
2 umSr)
²¨³¤(nm)
Chlorophyll a on April,20 2002
CMODIS
Suspended material on April,20 2002
CMODIS
1 、 SZ-3 spaceship
2 、 HY-1/COCTS
3 、 Conclusion
Development ocean color remote sensing in China in 2002
Satellite and orbit characteristics
Orbit type Near Circular and near sun-synchronous
Equator crossing local time
8:35-10:50am (descending node)
Altitude 798km Inclination 98.8 deg Period 100.8 minute Repeat observation period 3days for COCTS, 7days for CZI Mass 350kg Payload COCTS and CZI Attitude control 3 axis stabilized Downlink frequency X-band TT&C link S-band Designed life time 2 years Launch 2002 by using Long March 4 Manufacturer CAST
HY-1
HY-1 Payload 1. COCTS- Chinese Ocean
Color and Temperature Scannerby SITP
2. CZI- Coastal Zone Imager
(CCD Cameral) by CAST
Areas
SeaWiFS data 数据过境时间
COCTS data 数据过境时间
1 2002/06/21/T12 :00
2002/06/21/T09 :40
2 2002/06/21/T12 :00
2002/06/21/T09 :40
3 2002/06/21/T12 :00
2002/06/21/T09 :40
Comparing data and area
Cross-calibration area of COCTS and SeaWiFS on June 21,2002
COCTS
SeaWiFS
Comparing top radiance of COCTS and SeaWiFS
WaveLennth
(nm)
area1 Area 2 Area 3
SIPT NSOAS SIO SIPT NSOAS SIO SIPT NSOAS SIO
412 2.5072 6.74437 6.39404 2.3616 6.3527 5.89709 2.368 6.36992 5.95517
443 4.5968 6.25165 6.0617 4.0192 5.46611 5.27994 3.9984 5.43782 5.18225
490 5.384 5.33016 5.32091 4.0736 4.03286 4.02641 3.7168 3.67963 3.69219
520 5.3632 4.37423 4.65587 3.6912 3.01054 3.14347 3.2784 2.67386 2.7467
565 4.4752 3.87373 3.97712 2.6336 2.27964 2.27026 2.1568 1.86693 1.88696
670 1.5376 1.5376 1.50782 1.0176 1.0176 1.0118 0.7856 0.7856 0.80732
765 0.7968 0.7968 0.76303 0.6144 0.6144 0.58788 0.4224 0.4224 0.44152
865 0.5408 0.5408 0.42399 0.432 0.432 0.34686 0.2656 0.2656 0.22913
Comparing the calibration coefficient
400 500 600 700 800 9000
1
2
3
4
5
6
7 ʵÑéÊÒ¶¨±ê½á¹û µØÃ泡¶¨±ê½á¹û ½»²æ¶¨±ê½á¹û
L t(mW
/cm
2 /um
/Sr)
²¨³¤(nm)
Channel 1
Comparing the three different results of calibration method
400 500 600 700 800 9000
1
2
3
4
5
6
7
²¨³¤(nm)
L t(mW
/cm
2 /um
/Sr)
ʵÑéÊÒ¶¨±ê½á¹û µØÃ泡¶¨±ê½á¹û ½»²æ¶¨±ê½á¹û
Channel 2
Comparing the three different results of calibration method
400 500 600 700 800 9000
1
2
3
4
5
6
7L t(m
W/c
m2 /u
m/S
r)
²¨³¤(nm)
ʵÑéÊÒ¶¨±ê½á¹û µØÃ泡¶¨±ê½á¹û ½»²æ¶¨±ê½á¹û
Comparing the three different results of calibration method
Channel 3
Chlorophyll a from COCTS and SeaWiFS
By COCTS
By SeaWiFS
Suspended material from COCTS and SeaWiFS
By COCTS
By SeaWiFS
1 、 SZ-3 spaceship2 、 HY-1/COCTS3 、 What plan in 20034 、 Conclusion
Development ocean color remote sensing in China in 2002
2003 validation areas (March 20-Aple 30; Sep. 20-Oct. 30)
1 、 SZ-3 spaceship2 、 HY-1/COCTS3 、 What plan in 20034 、 Conclusion
Development ocean color remote sensing in China in 2002
Conclusion 11. The methodology of satellite to
satellite crossing calibration has been applied for CMODIS/SZ-3 and COCTS/HY-1. The results show this method is economical and practical way, especially for developing countries.
Conclusion 2
2. The CMODIS/SZ-3 and COCTS/HY-1 data are reasonable to map the chlorophyll, suspended material and temperature oceanography. The algorithm of processing above data are needed to improve in order to integrate with other space RS data.