FIG Regional Conference, Jakarta, Indonesia, …...L4 551.949 12.878 L3 530.713 11.492 L2 490.983...
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1 1 3 rd FIG Regional Conference, Jakarta, Indonesia, October 3-7, 2004 SUGIANTO, Ray MERTON, and Shawn LAFFAN (Australia) An overview of the CHRIS/PROBA Mission: A new generation of multi-angle hyperspectral remote sensing and its potential application to agriculture 2 CHRIS/Proba Mission Objective and Platform Characteristic Data Quality Assessment of test sites CHRIS DATA Quality at test sites Spatial and Spectral Comparison Classification Result..example Potential use for agriculture Current issue of CHRIS acquisition at Australia test sites Summary What the Presentation About…. 3 CHRIS : Compact High Resolution Imaging Spectrometer PROBA: Project for On-Board Autonomy Mission Objectives Provide Earth Surface Reflectance at 400-1050 nm (VIS/NIR), ‘high spatial’ & spectral resolution using ‘lite’ satellite Used for atmospheric, land, water and vegetation studies Capability to acquire data at different viewing angle configuration in short time interval CHRIS/PROBA CHRIS Multi-angular Viewing and Observation Time During Acquisition Start Imaging End Imaging - Five different angles acquisition for each target site - Interval angle (Fly Zenith Angle) 20-35 o - Average time observation 00.03’20” 5 CHRIS Acquisition Time at Colly site 55° Tobs C1 C2 C3 C4 C5 h ϕ 55° Tobs C1 C2 C3 C4 C5 h ϕ 00.03’20’’ 10.40.29 10.39.39 10.38.49 10.37.59 10.37.09 May-04 00.03’21’’ 11.42.22 11.41.31 11.40.41 11.39.51 11.39.01’ Mar-04 00.03’21’’ 11.35.22 11.34.31 11.33.49 11.32.51 11.32.01 Feb-04 00.03’20’’ 11.38.22 11.37.32 11.36.42 11.35.52 11.35.02 Nov-03 Tobs -55(C5) -36(C4) 0(C3) +36(C2) +55 (C1) Date Tobs = Tsc+Tmar+ Tsl+Tmar+Tsc+Tmar+ Tsl+Tmar+Tsc+Tmar+ Tsl+Tmar+Tsc+Tmar+ Tsl+Tmar+Tsc 1 st Acquisition (C1) 2nd acquisition (C2) 3 rd Acquisition (C3) 4 th Acquisition (C4) 5 th Acquisition (C5) Tobs = Tsc+Tmar+ Tsl+Tmar+Tsc+Tmar+ Tsl+Tmar+Tsc+Tmar+ Tsl+Tmar+Tsc+Tmar+ Tsl+Tmar+Tsc 1 st 3 rd 4 th 5 th 6 CHRIS/PROBA Key Characteristics & Sensor Modes Land Chlorophyll Land Water Atm / agri Bands Application < 2 degrees per year Orbit Drift Approximately 16 days Repeat cycles 0.01 Eccentricity 97.898 degrees Inclination 96.95 minutes Orbital Period 10.30 Equator Crossing time Sun Synchronous Type of Orbit 615 (560-670)km Mean Altitude Range 17 17 17 17 34 Resolution at nadir 6-33 6-11 6-33 6-33 6-20 Band With (nm) 438-1003 486-788 438-1035 406-1003 406- 992 Band Range (nm) 37 18 18 18 62 Band Number. Mode 5 Mode 4 Mode 3 Mode 2 Mode 1 Test sites (Australia)
Transcript of FIG Regional Conference, Jakarta, Indonesia, …...L4 551.949 12.878 L3 530.713 11.492 L2 490.983...
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3rd FIG Regional Conference, Jakarta, Indonesia, October 3-7, 2004
SUGIANTO, Ray MERTON, and Shawn LAFFAN (Australia)
An overview of the CHRIS/PROBA Mission: A new generation of multi-angle hyperspectral remote sensing and its potential application to
agriculture
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�CHRIS/Proba Mission Objective and Platform Characteristic
�Data Quality Assessment of test sites�CHRIS DATA Quality at test sites �Spatial and Spectral Comparison�Classification Result..example
�Potential use for agriculture�Current issue of CHRIS acquisition at
Australia test sites �Summary
What the Presentation About….
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CHRIS : Compact High Resolution Imaging Spectrometer
PROBA: Project for On-Board Autonomy
Mission Objectives� Provide Earth Surface Reflectance at 400-1050 nm
(VIS/NIR), ‘high spatial’ & spectral resolution using ‘lite’ satellite
� Used for atmospheric, land, water and vegetation studies
� Capability to acquire data at different viewing angle configuration in short time interval
CHRIS/PROBA
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CHRIS Multi-angular Viewing and Observation Time During Acquisition
Start Imaging End Imaging
- Five different angles acquisition for each target site- Interval angle (Fly Zenith Angle) 20-35o
- Average time observation 00.03’20”
55
CHRIS Acquisition Time at Colly site
55°
Tobs
C1 C2C3
C4 C5
h
ϕ
55°
Tobs
C1 C2C3
C4 C5
h
ϕ
00.03’20’’10.40.2910.39.3910.38.4910.37.5910.37.09May-04
00.03’21’’11.42.2211.41.3111.40.4111.39.5111.39.01’Mar-04
00.03’21’’11.35.2211.34.3111.33.4911.32.5111.32.01Feb-04
00.03’20’’11.38.2211.37.3211.36.4211.35.5211.35.02Nov-03
Tobs-55(C5)-36(C4)0(C3)+36(C2)+55 (C1)Date
Tobs = Tsc+Tmar+Tsl+Tmar+Tsc+Tmar+Tsl+Tmar+Tsc+Tmar+Tsl+Tmar+Tsc+Tmar+Tsl+Tmar+Tsc
1st Acquisition (C1)2nd acquisition (C2)3rd Acquisition (C3)4th Acquisition (C4)
5th Acquisition (C5)
Tobs = Tsc+Tmar+Tsl+Tmar+Tsc+Tmar+Tsl+Tmar+Tsc+Tmar+Tsl+Tmar+Tsc+Tmar+Tsl+Tmar+Tsc
1st
3rd
4th
5th
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CHRIS/PROBA Key Characteristics & Sensor Modes
Land Chlorophyll Land WaterAtm / agriBands Application< 2 degrees per yearOrbit Drift
Approximately 16 daysRepeat cycles 0.01Eccentricity
97.898 degreesInclination 96.95 minutesOrbital Period
10.30Equator Crossing timeSun SynchronousType of Orbit615 (560-670)kmMean Altitude Range
1717171734Resolution at nadir 6-336-116-336-336-20Band With (nm)
438-1003486-788438-1035406-1003406- 992Band Range (nm)3718181862Band Number.
Mode 5Mode 4Mode 3Mode 2Mode 1
Test sites (Australia)
2
77
43.4911016.591L18
9.6018908.298L17
18.856894.079L16
27.154870.936L15
22.342780.421L14
6.9621751.694L13
13.452741.471L12
6.1816712.509L11
6.0845706.333L10
11.777697.428L9
10.933674.730L8
15.681661.351L7
14.046631.732L6
10.663570.543L5
12.878551.949L4
11.492530.713L3
11.577490.983L2
12.150442.347L1
widthMidBand
400
500
600
700
800
900
1000
L1 L2 L3 L4 L5 L6 L7 L8 L9 L10
L11
L12
L13
L14
L15
L16
L17
L18
Min
Max
Mid
18-band CHRIS Datasets (Mode3 )..an example
nm
Mode information for each channel:� Minimum wavelength � Maximum wavelength� Middle wavelength� Band Width� Gain� Row Number for Minimum wavelength� Row number for Maximum wavelength
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Iffly (Colly cotton)
AusCott
TEST SITES
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CHRIS Data transferred
Initial Statistical cal.
Atm. correction
Calc./Subset, e.g. SNRData conversion process
registrationsmoothing
reflectance/Geo-corrected data
Initial Data Quality Assessment Method
CHRIS DataCorrected
Users
CHRIS Datastorages
�� Negative radiance valueNegative radiance value�� low quality, “bad low quality, “bad
bands”bands”�� Positive radiance valuePositive radiance value
�� good quality," good good quality," good bands” bands”
ELIARRACORNMODTRAN4
Relative
Absolute
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1. ‘Raw’ Radiance Quality
2:110 (55.55%)
1-10 8 (44.44%)
11-1818(3)
09-4-04
5:150 (80.65%)
12-15, 17-62
12 (19.35%)
1-11, 16,
62(1)
25-3-04Aus-Cott
17:11794.45%
1-171 (5.55%)
1818(3)
29-5-04
7:153 (85.48%)
2-4, 13-62
9 (14.52%)
1,5-1262(1)
21-2-04Colly
Total Band position
TotalBand position
Good/Bad Band Ratio
Good BandBad BandNo. of Bands/Mode
DateAcqu.Sites
“Bad” = negative radiance
“Good” = positive radiance
A. CHRIS DATA QUALITY
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2. SNR of CHRIS raw radiance values
11.72.815.83.78.82.710.43.59.03.01809/04/04
8.62.48.62.77.41.98.62.78.02.46225/03/04AusCot
3.61.116.93.75.01.98.32.98.12.21829/5/04
11.44.818.35.210.33.112.63.410.63.3 6221-2-04Colly
MaxMinMaxMinMaxMinMaxMiMaxMin
-55deg55deg-36deg36deg0degTotal Bands
DateSites
i
ii
DNSNR
σ=
Mean in Channel i
Standard Deviation in Channel i
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Soil Spectra
1.0
1.2
1.4
1.6
1.8
2.0
2.2
400 500 600 700 800 900 1000
Wavelenght(nm )
Ras
io
Ras io55/-55
Ras io36/-36
Vegetation Spectra
-5
-3
-1
1
3
5
7
9
500 600 700 800 900 1000
Wavelenght(nm)
Ras
io
Ras i955.-55
Ras io36/-36
- Ratio of corresponding view directions and wavelength
3
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3. CHRIS Radiance Image Sequence (Uncorrected)
+55º (N-S) +36º (N-S)
0
5
10
15
20
25
30
400 500 600 700 800 900 1000 1100
Wavelength
Rad
ian
ce (
DN
) x1
000
0deg
36deg
-36deg
55deg
-55deg
18-bands
0
5
10
15
20
420 520 620 720 820 920
Wavelength (nm)
Ra
dian
ce
(DN
)x1
000
0deg
36deg
-36deg
55deg
-55deg
62-band data62-bands
0o(Nadir) -36º (S-N) -55º (S-N)
18-band, 17 m
62-band, 34 m
1414
4. CHRIS Image Sequence (corrected)
18-band, 17 m
62-band,34 m
+55deg+36deg
0o(Nadir) -36deg
-55deg
Reference points
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CHRIS Surface Reflectance Data
0.0
0.5
1.0
1.5
2.0
2.5
3.0
3.5
400 500 600 700 800 900 1000
Wavelength (nm)
Ref
lect
ance
x100
0
0deg
36deg
min36deg
55deg
min55deg
18-band Spectra
ROI
0
1
2
3
4
5
440 540 640 740 840 940
Wavelength (nm)
Ref
lect
ance
(D
N)X
1000
0deg
36deg
min36deg
55deg
min55deg
62-band Spectra
1616
RGB & Sampling Spectra (selected land covers)
HyMap(Airborne)
CHRIS (Space borne)
B. Spatial and Spectral Comparison
1717
CHRIS, Hyperion and HyMap on Selected Target Spectra
5. Comparison…continued
1818
Spectral Angle Mapper6. Classification Results.. an example 18 band datset
K-Means
Classification can be applied for CHRIS-Unsupervised-Supervised
And…more detail spectral mapping is possible
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Potential Use of CHRIS dataset for Agriculture
� Selectable band modes�Spectral Resolution (18, 37, 62 channels)�Spatial resolution (17, 34 m)�High percentage of “good” bands
� Multi-angle viewing capability
� CHRIS dataset can be used for:
�Image Classification (spatial analysis)�Spectral Analysis for Vegetation/Crop & Soil�BRDF/Vegetation retrieval models
2020
Current Issues of CHRIS Applicationat Colly and AusCott
�Multi-date data setCHRIS / PROBA as unique opportunityBefore, during and after growing seasonData assimilation (crop growth models)�Noise correction
Drop outs (horizontal lines) Vertical striping.
�Atmospheric correction
�CHRIS Modes Selection
�Validation
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SUMMARY
CHRIS imagery of test site indicates� Useful for mapping spatial variation of land
surface�Multi-angle images, possibility better
classification. �Inversion of canopy BRDF models possible. �Available image analysis techniques could be
used to derive better products, eg. red-edge, BRDF retrieval, spectral mapping etc.
Website : http://www.rsal.co.uk/chris
