eo-1 hyperion spectral time series - nasa...eo-1 hyperion spectral time series for assessment of...
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EO-1 Hyperion Spectral Time Series for assessment of ecosystem function
Petya K. E. Campbell1, 2
K. Fred Huemmrich1, 2 , Elizabeth M. Middleton1
and Sarah Voorhies 2
1 NASA/Goddard Space Flight Center, USA2 University of Maryland Baltimore County
Hotspots of bio-diversityhttp://www.plants2020.net/about-the-gspc
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EO-1 Acquisitions Since Launch
>85,000 (2000 through May 2016)
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Repeated Collections at: CEOS calibration sites (blue triangles), FLUX sites (green
triangles), NEON (white circles) and Volcanoes (purple diamonds)
EO-1 Hyperion Spectral Time Series
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FLUX site locations and number of
Hyperion cloud free images
EO-1 Spectral Time Series at FLUX Sites
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Seasonal Spectral Changes
0
0.05
0.1
0.15
0.2
0.25
0.3
0.35
0.4
0.45
0.5
42
7
51
8
61
0
70
2
79
3
88
5
98
3
10
74
11
65
12
55
13
46
14
37
15
28
16
19
17
10
18
00
18
91
19
82
20
73
21
63
22
54
23
45
Re
fle
cta
nc
e
Wavelength (nm)
Harvard Forest, Deciduous2001248
2002251
2002260
2002363
2003014
2008128
2008146
2008192
2008120
2008338
2013094
2013136
00.05
0.10.15
0.20.25
0.30.35
0.40.45
0.5R
efl
ec
tan
ce
Acquisition date (YearDOY)
Stable - Sand Pith
641 549 651 844
1003 1679 2204
Changes in the chemical and physical configuration of vegetation canopies are expressed as changes in the contiguous spectral signatures.
Green et al. 2012
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Data and Processing
• Gross Primary Production (GPP = GEP, µmol m-2 s-1) • Ecosystem Respiration (Re) -calculated from relationships between
nighttime Net Ecosystem Exchange (NEE) and air temperature• Net Ecosystem Production -> from the observed GEE and Re
GEE = gross ecosystems exchangeNEP = GEE – ReNEE = -NEP
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FLUX Site, Location Harvard Forest, MA, USA Park Falls, WI, USA Skukuza, South Africa
Climate Temperate Temperate Arid, Steppe, Hot
Vegetation type
Northern Hardwoods: EMS
Evergreen: Eastern
hemlock
Deciduous Broadleaf
MixedGrassland Savannah
Tower height (m)US-Ha1 and US-Ha2
30 m
US-Pfa
30 m, 122 m, 396 m
ZA-Kru
30 m
Hyperion images 12 (2001-2013) 47 (2008-2014) 72 (2008-2014)
Sites
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GEE
maps
Date (mm/dd/yy)
GEE
, Te
mp
era
ture
& H
um
idit
y
OSA
VI
Hyperion Time Series at Skukuza
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Midday GEP estimated using a partial least squares regression
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Average Hyperion spectral reflectance for Skukuza (black) and the coefficients derived
from PLSR vs. GEP (red)
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FD
FWHM
FA
Changes in Vegetation Reflectance and Spectral Features, Skukuza
Chlorophyll
Water absorption
2008-2014 (76) Wavelength (nm)
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Chlorophyll Feature (PRISM) and GEE
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Narrow-band VIs and GEE
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Seasonal Variation in GEE and Spectral VIs (G31), Skukuza
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-15 5(μmol m-2 s-1, estimates based on FD)
GEE at Skukuza, Based on FD
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Skukuza, Hyperion VIs, Regression Coefficients (R2)
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-5
0
5
10
15
20
25
0
1
2
3
4
5
6
0 50 100 150 200 250 300 350
NEP
(CO
2μ
mo
lm-2
s-1),
Pre
cip
itat
ion
(cm
)
G3
2 =
(R
75
0-R
44
5)/
((R
70
0-R
44
5)
G32 CO2 flux Precipitation
Spectral bio-indicator associated with chlorophyll content best captured the CO2
dynamics related to vegetation phenology. Required multitemporal data set.
Corresponding Spectral and NEP Phenology
Day of Year
A. Dry season (DOY 214)B. Wet season (DOY 22)
Mongu : Campbell et al. 2013
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• The results indicate a strong correlation between CO2 flux
parameters and Hyperion's spectral parameters associated with
chlorophyll and photosynthetic function.
• The spectral parameters associated with photosynthetic
dynamics across all sites require continuous spectra.
– In the conifer forests chlorophyll levels do not change as significantly as in
the deciduous forest. In the hemlock forest (Ha 2: HL) phenology was
traceable with the PRI3 SBI, when in the deciduous canopies (Ha1: EMS,
Park Falls and Skukuza) derivative and feature depth SBIs performed
better.
• The approach requires a diverse spectral coverage
representative of the seasonal dynamics in vegetation function.
This study provides a step toward a common (global) hyperspectral
strategy to monitor the vegetation ability to uptake CO2.
Conclusions
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Locations with >10 Hyperion Acquisitions
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Spectral Parameters and LUE, Skukuza