Transcript NRL09/21/2004_Davis.1 GOES-R HES-CW Requirements Curtiss Davis COAS, Oregon State university Visible Infrared Imaging Radiometer Suite (VIIRS) • Being built by Raytheon SBRS – SeaWiFS and MODIS heritage Channel Name M1 M2 M3 M4 M5 M6 M7 M15 M16 channel Center 412 nm 445

NRL09/21/2004_Davis.1
GOES-R HES-CW Requirements
Curtiss Davis
COAS, Oregon State university
Visible Infrared Imaging Radiometer Suite
(VIIRS)
• Being built by Raytheon
SBRS
– SeaWiFS and MODIS
heritage
Channel
Name
M1
M2
M3
M4
M5
M6
M7
M15
M16
channel
Center
412 nm
445 nm
488 nm
555 nm
672 nm
751 nm
865 nm
10.8 m
12.0 m
Channel
Width
20 nm
18 nm
20 nm
20 nm
20 nm
15 nm
39 nm
1.0 m
1.0 m
Ltypical
ocean
44.9
40
32
21
10
9.6
6.4
300K
300K
Required
VIIRS
SNR/NET SNR/NET
352
380
415
361
242
199
215
.070
.072
670
506
515
446
~ 400
~ 400
314
.041
.041
• First flight on NPOESS
Preparatory Project (NPP)
in 2008 then NPOESS
satellites starting in 2010
• Seven ocean color
channels and 2 SST
channels
•Approximately 1 km GSD ocean color
–742 m GSD and Nadir, 1092 m at +/- 850 km, 1597m at End of Scan
(+/- 1500 km)
–Designed to meet global ocean imaging requirements at 1 km GSD
–Maximum revisit frequency of twice a day at 1030 and 1530
NRL09/21/2004_Davis.2
M
Why HES-CW given VIIRS?
• Tides, diel winds (such as the land/sea breeze),
river runoff, upwelling and storm winds drive
coastal currents that can reach several knots.
Furthermore, currents driven by diurnal and
semi-diurnal tides reverse approximately every 6
hours.
• VIIRS daily sampling at the same time cannot
resolve tides, diurnal winds, etc.
• HES-CW will provide the capability to view
coastal waters from a geostationary platform
that will provide the management and science
community with a unique capability to observe
the dynamic coastal ocean environment.
• HES-CW will provide higher spatial resolution
(300 m vs. 1000 m)
• HES-CW will provide additional channels to
measure solar stimulated fluorescence,
suspended sediments, CDOM and improved
Example tidal cycle from
atmospheric correction.
Charleston, OR. Black
arrows VIIRS sampling,
red arrows HES-CW
These improvements are critical for the
sampling.
analyses of coastal waters.
NRL09/21/2004_Davis.3
HES-PORD Channel Specifications
HES-CW Channel Specifications
Nominal Threshold
Channel Center
Wavelength (um)
Nominal
Threshold
Resolution (um)
Nominal
Nominal GOAL Channel Nominal GOAL
Threshold Signal Center Wavelength (um) Resolution (um)
to Noise
0.412
0.02
0.407 through 0.987
0.01
0.443
0.477
0.49
0.51
0.53
0.02
0.02
0.02
0.02
0.02
0.57
1.38
1.61
2.26
11.2
0.01
0.03
0.06
0.05
0.8
0.55
0.02
12.3
1
NRL09/21/2004_Davis.4
300 to 1 all
channels
0.645
0.02
Nominal
Threshold Horiz.
Resolution
0.667
0.678
0.75
0.763
0.865
0.905
0.01
0.01
0.02
0.02
0.02
0.035
300-meters all
channels
(at Equator)
Nominal Goal
Signal to Noise
900 to 1 all
channels
Nominal Goal
Horiz. Resolution
150-meters all
channels
(at Equator)
NRL09/21/2004_Davis.5
COAST proposed new HES-CW Channel
Specifications
COAST Proposed HES-CW Channel Specifications
Nominal
Threshold
Channel Center
0.412
0.443
0.49
0.51
0.53
0.55
0.58
0.61
0.645
0.667
0.678
Nominal
Threshold
Resolution
0.02
0.02
0.02
0.02
0.02
0.02
0.02
0.02
0.01
0.01
0.01
0.75
0.02
0.865
0.02
1.000 (0.72
backup)
0.04 (0.02)
Nominal
Threshold
Signal to Noise
300 to 1 all
channels
Nominal GOAL
Channel Center
Wavelength (um)
0.345
0.38
0.407 through 0.987
0.57
0.72
1.24
1.38
1.61
2.26
11.2 (2 km)
12.3 (2 km)
Nominal
GOAL
Resolution
0.02
0.02
0.01
0.01
0.02
0.04
0.03
0.06
0.05
0.8
1
Nominal Goal
Signal to Noise
900 to 1 all
channels
Nominal
Threshold
Horiz.
Resolution
Nominal Goal
Horiz.
Resolution
300-meters
(at Equator)
150-meters
(at Equator)
except for LW
IR channels
Wavelength (m)
Application
0.412 (THRESHOLD)
Colored dissolved organic Matter (CDOM)
0.443 (THRESHOLD)
Chlorophyll a, CDOM Particulate Organic Carbon (POC)
0.477 (THRESHOLD) XXX
Chlorophyll a and Chlorophyll b, O2:O2 dimmer
0.490 (THRESHOLD)
Chlorophyll a and accessory pigments
0.510 (THRESHOLD)
Accessory Pigments
0.530 (THRESHOLD)
Accessory pigments, Suspended sediment
0.550 (THRESHOLD)
Chlorophyll a, accessory pigments, suspended sediments, (POC)
0.580 new threshold
Accessory pigments, suspended sediments, water clarity
0.610 new threshold
Suspended sediments, water clarity
0.645 (THRESHOLD)
Suspended sediments, coccolith concentration
0.667 (THRESHOLD)
Chlorophyll a, Fluorescence
0.678 (THRESHOLD)
Chlorophyll a fluorescence
0.720 new threshold if no 1.00
Atmospheric correction, chlorophyll fluorescence
0.750 (THRESHOLD)
Atmospheric correction
0.763 (THRESHOLD) XXX
O2 A band
0.865 (THRESHOLD)
Atmospheric correction, cloud clearing
0.905 (THRESHOLD) XXX
Column water
1.000 new threshold (40 nm)
Atmospheric Correction
0.407 to .987 in 10 nm channels (GOAL)
Hyperspectral imaging for discrimination of in-water and bottom features
0.345 new goal (20 nm)
Atmospheric correction in coastal waters
0.380 new goal (20 nm)
CDOM, Atmospheric correction in coastal waters
1.240 GOAL (40 nm)
Atmospheric Correction
1.38 (GOAL)
Daytime cirrus cloud
1.61 (GOAL)
Daytime cloud water
2.26 (GOAL)
Daytime cloud properties
11.2 (GOAL)
Total water for Sea Surface Temperature (SST)1
12.3 (GOAL)
Sea Surface Temperature (SST)1
NRL09/21/2004_Davis.6
Frequency of Sampling and Prioritizing Goal
Requirements
• Threshold requirement is to sample all
Hawaii and Continental U. S. coastal waters
once every three hours during daylight
– Plus additional hourly sampling of
selected areas
• Goal requirement is hourly sampling of all
U.S. coastal waters is strongly
recommended, for cloud clearing and to
better resolve coastal ocean dynamics.
• Goal requirements compete with each other,
e.g. higher spatial resolution makes it harder
to increase sampling frequency or SNR.
• COAST top priority goals are:
– Higher frequency of sampling
– Goal channels for atmospheric correction
– Hyperspectral instead of multispectral
NRL09/21/2004_Davis.7
HES-CW built to the threshold requirements will be a dramatic
improvement over present capabilities for coastal imaging.