development ocean color remote sensing in china in 2002 pan delu he xinqing etc....

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


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)


6 8 10 12 14 16

5

6

7

8

9

10

11

12

13

14


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)


Band 473

6 8 10 12 14 16

4

6

8

10

12

14


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


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)


Band 533

4 6 8 10 12 14

2

4

6

8

10

12


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


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 Êµ²â ¶¨±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


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 ÊµÑéÊÒ¶¨±ê½á¹û µØÃæ³¡¶¨±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)

ÊµÑéÊÒ¶¨±ê½á¹û µØÃæ³¡¶¨±ê½á¹û ½»²æ¶¨±ê½á¹û

Channel 2


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)

ÊµÑéÊÒ¶¨±ê½á¹û µØÃæ³¡¶¨±ê½á¹û ½»²æ¶¨±ê½á¹û


Channel 3

Chlorophyll a from COCTS and SeaWiFS

By COCTS

By SeaWiFS

Suspended material from COCTS and SeaWiFS

By COCTS

By SeaWiFS

2003 validation areas (March 20-Aple 30; Sep. 20-Oct. 30)

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.

development ocean color remote sensing in china in 2002 pan delu he xinqing etc....

Documents