Satellite image data are replacing most applications of aerial photographs in nearly all Pacific Island Countries now. This is due to its lower cost and easier use compared with the classical aerial photograph.
To capture aerial photography a special plane has to be brought to a Pacific island, satellite imagery on the other hand are captured by satellites already in space and can record an area whenever it flies over it. To record imagery for Pacific Island Countries a satellite needs an onboard storage device to upload image data. This data is then downloaded ground antennas/receiving station in Kiruna, Sweden as the satellites passes over it. defined the scene centres for The older satellites such as Landsat, record strictly in nadir (directly below) view which meant that the orbit defined the centre of the satellite scene. Fortunately, modern satellites can now either turn themselves or their sensors sideways allowing for a faster coverage of any target area and also at the same time create a mosaic of image patches with different view angles and atmospheric conditions.
TRIVIA: Satellites have a life expectancy of about 5 years. Unlike aeroplanes satellites orbit at a very high altitude and are thus more stable.
The sensors of the old generation satellites such as Landsat and SPOT recorded in 8bit data range on the other hand modern satellites such as IKONOS and QuickBird? record in 11bit data range, allowing for a more detailed recording but requires a conversion back to 8bit data for use as GIS backdrops.
The price of satellite data always varies thus it is important to get a new quotation for each area. Often companies also have special offers for archived data. The prices listed in this paper include a discount offered by MDA (former RadarSat? International) to SOPAC. Customers ordering directly from the company and not through SOPAC will not be entitled for this discount.
ADEOS
MISSION
The objective of ADEOS-1 was to acquire data on worldwide environmental changes such as the greenhouse effect, ozone layer depletion, tropical rain deforestation, and abnormal climatic conditions.
SATELLITE SPECIFICATIONS
Launch Date
Operating
Orbit
Flying Height
Orbit Inclination
Operator
14 December 2002
YES
Polar Orbiting
803 km, circular
98.7°
Japan Aerospace Exploration Agency
SENSORS OF THE ADEOS SATELLITE
AVNIR: Advanced Visible and Near-Infrared? Radiometer
OCTS: Ocean Colour Temperature Scanner
NSCAT: NASA Scatterometer from NASA
TOMS: Total Ozone Mapping Spectrometer from NASA
POLDER: Polarization and Directionality of the Earth's Reflectances a geosurface reflection measuring device from CNES.
IMG: Interferometric Monitor for Greenhouse Gases a sensor for measuring the greenhouse effect from the Ministry of International Trade and Industry.
ILAS: Improved Limb Atmospheric Spectrometer), an improved spectrometer for measuring infrared radiation on the edge of the atmosphere
RIS: Retroreflector In-Space?, a retroreflector for measuring laser long light-path absorption between the earth and satellites.
SPECTRAL COVERAGE
AVNIR
420 nm – 890 nm
8 m
ADEOS 2
MISSION
The ADEOS-II is expected to acquire the date necessary to understand the circulation of water and energy, and the circulation of carbon in order to contribute to study the global environment changes including seizing the mechanism of global environmental changes.
SATELLITE SPECIFICATIONS
Launch Date
Operating
Orbit
Flying Height
Orbit Inclination
Operator
14 December 2002
YES
Polar Orbiting
803 km, circular
98.7°
Japan Aerospace Exploration Agency
SENSORS OF THE ADEOS 2 SATELLITE
AMSR: Advanced Visible and Near-Infrared? Radiometer
GLI: Ocean Colour Temperature Scanner
POLDER: Polarization and Directionality of the Earth's Reflectances a geosurface reflection measuring device from CNES.
ILAS: Improved Limb Atmospheric Spectrometer), an improved spectrometer for measuring infrared radiation on the edge of the atmosphere
SPECTRAL COVERAGE
AVNIR
420 nm – 890 nm
8 m
ALOS
MISSION
The mapping of land areas (without the need for ground control points) for cartographic applications.
The monitoring of disasters on a global scale (as a complement to the capabilities of other spacecraft).
Satellite has two state-of-the-art Panchromatic (PAN) cameras that take black and white stereoscopic pictures of the earth in the visible region of the electromagnetic spectrum.
SPECTRAL COVERAGE
PAN CAMERA
Black and White
500 nm – 850 nm
2.5 m
COST OF IMAGE DATA
$US 1,800 per scene of 27.5 km by 27.5 km. It is possible to order by area of interest, which will cost $US 2.75 per square km
Cartosat-2
MISSION
For detailed mapping and other cartographic applications at cadastral level, urban and rural infrastructure development and management, as well as applications in Land Information System (LIS) and Geographical Information System (GIS).
Satellite has two state-of-the-art Panchromatic (PAN) cameras that take black and white stereoscopic pictures of the earth in the visible region of the electromagnetic spectrum.
SPECTRAL COVERAGE
PAN CAMERA
Black and White
500 nm – 850 nm
2.5 m
COST OF IMAGE DATA
$US 1,800 per scene of 27.5 km by 27.5 km. It is possible to order by area of interest, which will cost $US 2.75 per square km
COSMO-SkyMed
MISSION
The COSMO-SkyMed system is a constellation of four satellites using high-resolution radar to observe the Earth day or night, regardless of weather conditions, for dual (civil and military) use.
Its purpose is to monitor the globe for the sake of emergency prevention (management of environmental risks), strategy (defence and national security), and scientific and commercial purposes
Synthetic aperture radar (SAR) sensors with global coverage of the planet
GeoEye-1
MISSION
Satellite provides highly accurate, extremely detailed Earth imagery for broad area coverage and updating geospatial foundational layers and mapping databases.
The GOCE (Gravity Field and steady-state Ocean Circulation Explorer) mission is dedicated to measuring the Earth's gravity field and modelling the geoid with unprecedented accuracy and spatial resolution.
SATELLITE SPECIFICATIONS
Launch Date
Operating
Orbit
Orbit Inclination
Operator
17th March,2009
YES
near-Sun-synchronous polar orbit
96.7º
Italian Space Agency
SENSORS
Electrostatic Gravity Gradiometer (EGG) to measure the gravity field of Earth.
GPS receiver to be used as a Satellite-to-Satellite? Tracking Instrument (SSTI) to supplement the gradiometer measurements
Laser Retroreflector to allow its precise orbit to be tracked by a global network of ground stations through the Satellite Laser Ranging Service. This provides accurate positioning for orbit determination and data products.
SPECTRAL COVERAGE
PAN CAMERA
Black and White
500 nm – 850 nm
2.5 m
RapidEye
MISSION
RapidEye is a constellation of five Identical Satellites whereby each satellite contains identical sensors and is equally calibrated and travel on the same orbital plane. Therefore, an image from one satellite will be equivalent to an image from any of the other four, allowing for a large amount of imagery to be collected. The constellation is designed to provide customised information products and services.
SATELLITE SPECIFICATIONS
Launch Date
Operating
Orbit
Orbit Inclination
Operator
17th March,2009
YES
near-Sun-synchronous polar orbit
96.7º
Italian Space Agency
SENSORS
Multi-spectral pushbroom style imager.
SPECTRAL COVERAGE
PAN CAMERA
Black and White
500 nm – 850 nm
2.5 m
QuickBird-1
MISSION
Satellite provides environmental data useful for analyses of changes in land usage, agricultural and forest climates.
SATELLITE SPECIFICATIONS
Launch Date
Operating
Orbit
Orbit Inclination
Flying Height
Storage Space
Operator
17th March,2009
YES
near-Sun-synchronous polar orbit
98º
450km
128 Gb
DigitalGlobe
SENSORS
BGIS 2000
SPECTRAL COVERAGE
Panchromatic
Black &White:
450 nm - 900 nm
61 cm
Multispectral
Blue
450 nm- 520 nm
2.44 m
Green
520 nm -600 nm
2.44 m
Red
630 nm -690 nm
2.44 m
Near-IR
760 nm - 900 nm
2.44 m
Ground Coverage
Nominal swath width: 16.5-kilometers at nadir
Accessible ground swath: 544 km centered on the satellite ground track
Areas of interest:
Single Area - 16.5 km x 16.5 km
Strip - 16.5 km x 165 km
COST OF IMAGE DATA
Pan-sharpened data 11bit ~ $US 20 per square km for new collection and ~ $US 15 per square km for archive data. The minimum area for which a customer can order image data is 64 square km
IKONOS-2
SATELLITE SPECIFICATIONS
Launch Date
Operating
Orbit
Orbit Inclination
Flying Height
Storage Space
Operator
Price List
24.09.99 YES
near-Sun-synchronous polar orbit
98.1º
681km
64 GB
GeoEye
Multi-spectral image data were ordered for ~ $US 13.50 per square km for new collection. The minimum area for data purchase is 100 square km
1.26° Off-Nadir? 1.0 meter panchromatic 4.0 meters multispectral
Ground Coverage===__
11.3 km at nadir0 13.8 km at 26° off-nadir
EROS-B
MISSION
Earth Observation
SATELLITE SPECIFICATIONS
Launch Date
Operating
Orbit
Ground Coverage
Operator
25.04.06
YES
500km
7km
ImageSat International
SENSORS
CCD - Charge Coupled Device
TDI - Time Delay Integration
SPECTRAL COVERAGE
PAN
500 nm - 900 nm
0.7 m
ENVISAT
MISSION
The Envisat data supports Earth science research and allows monitoring of the evolution of environmental and climatic changes. Furthermore, the data facilitates the development of operational and commercial applications
SATELLITE SPECIFICATIONS
Launch Date
Operating
Orbit
Ground Coverage
Orbit Inclination
Flying Height
Storage Space
Operator
01 March 2002
YES
Sun-synchronous
swath width of 1,150 km
98.55º
450km
30 Gb
European Space Agency
SENSORS
Envisat carries an array of nine Earth-observation instruments that gather information about the earth (land, water, ice, and atmosphere) using a variety of measurement principles.
ASAR (Advanced Synthetic Aperture Radar) operating in C band can detect changes in surface heights with sub-millimeter precision.
MERIS (MEdium Resolution Imaging Spectrometer) measures the reflectance of the Earth (surface and atmosphere) in the solar spectral range (390 to 1040 nm) and transmits 15 spectral bands back to the ground segment.
AATSR (Advanced Along Track Scanning Radiometer) can measure the temperature of the sea surface
RA-2 (Radar Altimeter 2) is a dual-frequency Nadir pointing Radar operating in the Ku band and S bands, it is used to define ocean topography, map/monitor sea ice and measure land heights.
MWR (Microwave Radiometer) for measuring water vapour in the atmosphere and estimate the tropospheric delay for the Altimeter
DORIS (Doppler Orbitography and Radiopositioning Integrated by Satellite) for orbit determination to within 10 cm or less
GOMOS (Global Ozone Monitoring by Occultation of Stars) looks to stars as they descend through the Earth's atmosphere and change color, which also tells a lot about the presence of gases such as O3 (ozone), and allows for the first time a space-based measurement of the vertical distribution of these trace gases.
MIPAS (Michelson Interferometer for Passive Atmospheric Sounding) is a spectrometer
SCIAMACHY (SCanning Imaging Absorption spectroMeter for Atmospheric CHartographY) compares light coming from the sun to light reflected by the Earth, which provides information on the atmosphere through which the earth-reflected light has passed.
SPECTRAL COVERAGE
MERIS-EV1-01
407.5 nm-417.5 nm
300 m
MERIS-EV1-02
437.5 nm-447.5 nm
300 m
MERIS-EV1-03
485 nm-495 nm
300 m
MERIS-EV1-04
505 nm-515 nm
300 m
MERIS-EV1-05
555 nm-565 nm
300 m
MERIS-EV1-06
615 nm-625 nm
300 m
MERIS-EV1-07
660 nm-670 nm
300 m
MERIS-EV1-08
677.5 nm-685 nm
300 m
MERIS-EV1-09
703.75 nm-713.75 nm
300 m
MERIS-EV1-10
750 nm-757.5 nm
300 m
MERIS-EV1-11
758.75 nm-762.5 nm
300 m
MERIS-EV1-12
771.25 nm-786.25 nm
300 m
MERIS-EV1-13
855 nm-875 nm
300 m
MERIS-EV1-14
880 nm-890 nm
300 m
MERIS-EV1-15
895 nm-905 nm
300 m
Formsat-2
MISSION
Earth observation
SATELLITE SPECIFICATIONS
Launch Date
Operating
Orbit
Orbit Inclination
Flying Height
Storage Space
Operator
20.05.04
YES
Polar Sun Synchronous
99.14°
891km
41 Gb
National Space Organisation
SENSORS
RSI: Remote Sensing Equipment
SPECTRAL COVERAGE
Panchromatic
Black/White
450 nm – 900 nm
2 m (near vertical observation)
Multi-Spectral
blue
450 nm – 520 nm
8 m
green
520 nm – 600 nm
8 m
red
630 nm – 690 nm
8 m
near infrared
760 nm – 900 nm
8 m
IRS-1C
MISSION
Crop acreage and yield estimation, forest resources survey, urban mapping, flood mapping, wasteland mapping and drought monitoring and assessment.
SATELLITE SPECIFICATIONS
Launch Date
Operating
Orbit
Flying Height
Operator
Price List
December 28, 1995
No
polar sun synchronous
817km
Department of Space, Govt of India.
Panchromatic $US 900 for 23km x 23km Panchromatic $US 2,500 for 70km x 70km LISS-III $US 1,900 for 70km x 70 km
SENSORS
Panchromatic Camera
Linear Imaging Self Scanner-3 (LISS)
Wide Field Sensor (WIFS)
SPECTRAL COVERAGE
PAN Camera
Black and White
500 nm - 750 nm
5.8 m
LISS
Green
520 nm - 590 nm
23.5 m
Red
620 nm - 680 nm
23.5 m
NIR
770 nm - 860 nm
23.5 m
SWIR
1550 nm - 1700 nm
23.5 m
WIFS
Red
620 nm - 680nm
188
NIR
770 nm - 860 nm
188 m
Ground Coverage
LISS-III
141 km (visible and near IR region)
148 km (shortwave IR region)
WiFS Camera
770 km
--
IRS-1D
SATELLITE SPECIFICATIONS
Launch Date
Operating
Orbit
Flying Height
Operator
29th September, 1997
No
polar sun synchronous
817km
Department of Space, Govt of India
SENSORS
Panchromatic Camera
Linear Imaging Self Scanner-3 (LISS)
Wide Field Sensor (WIFS)
SPECTRAL COVERAGE
LISS III
Green
520 nm - 590 nm
23.7 m
Red
620 nm - 680 nm
23.7 m
NIR
770 nm - 860 nm
23.7 m
SWIR
1550 nm - 1700 nm
23.7 m
WIFS
Red
620 nm - 680nm
188
NIR
770 nm - 860 nm
188 m
PAN Camera
Black and White
500 nm - 750 nm
5.8 m
Ground Coverage
LISS-III
127 km (bands 2, 3, 4)
134 km (band 5 -MIR)
WiFS Camera
692 km
--
PAN CAMERA
65 -80 km
--
KOMPSat-1
MISSION
Main mission is to provide cartography to provide the images from a remote earth view for the production of 1/25000-scale maps of Korean territory.
SATELLITE SPECIFICATIONS
Launch Date
Operating
Orbit
Flying Height
Storage Space
Operator
27th October, 2008
YES
Sun-Synchronous
685km
2.5 Gbit
Korea Aerospace Research Institute
SENSORS
Electro-Optical Camera (EOC),
Ocean Scanning Multispectral Imager (OSMI),
Space Physics Sensor (SPS) and SPS consists of High Energy Particle Detector (HEPD) and
Ionosphere Measurement Sensor (IMS)
SPECTRAL COVERAGE
Visible spectral band of 510 nm ~ 730 nm
OSMI is a multi-spectral imager generating 6 colour ocean images. OSMI is designed to provide on-orbit spectral band selectability in the spectral range from 400nm to 900nm for flexible ocean observation. The colour images are collected through 6 primary spectral bands centered at 412, 443, 490, 555, 765, 865nm or 6 spectral bands selected in the spectral range via ground commands after launch.
GROUND COVERAGE
EOC has a swath width of 17 km at Nadir.
OSMI has an 800 km swath width and less than 1km GSD by whisk-broom scanning method
KOMPSat-2
MISSION
For the production of maps and digital elevation models, applications for which include land use planning and disaster and risk management.
The Landsat TM sensor is able to gather seven bands of data as opposed to the four bands of data collected from the MSS (Multispectral Scanner.) In addition to having three more bands of data to work with, scientists are able to view the TM data at a much higher resolution than with MSS. Bands 1-5 and 7 each have a spectral resolution of 30m while the MSS is only offered in 79m and 82m resolutions. Band 6 (which is a Thermal infrared band) has a maximum spatial resolution of 120m.
GROUND COVERAGE
TM provided 7 bands of coverage and the MSS had 4 bands. MSS covers 0.5 to 12.6 µm with 80 m resolution and a 185 km swath width.
TM covers 0.45 to 12.5 µm with resolution of 30 m in the VIS/IR bands and 120 m in the thermal/IR bands.
TM provided 7 bands of coverage and the MSS had 4 bands. MSS covers 0.5 to 12.6 µm with 80 m resolution and a 185 km swath width.
TM covers 0.45 to 12.5 µm with resolution of 30 m in the VIS/IR bands and 120 m in the thermal/IR bands.
Landsat-7
MISSION
To obtain continuous high-resolution imagery of the earth's surface for environmental monitoring, disaster assessment, land use and regional planning, cartography, range management, oil and mineral exploration.
Two high resolution geometrical (HRG) instruments.
A HRS imaging instrument which operates in panchromatic mode.
SPECTRAL COVERAGE
Panchromatic
Black &White:
520 nm-900 nm
30 m
Multispectral
Green
500 nm-590 nm
10 m
Red
610 nm-680 nm
10 m
Near Infrared
780 nm-890 nm
10 m
Short Wave infrared
1580 nm-1750 nm
20 m
SPOT 5
MISSION
The SPOT 5 satellite was designed to ensure SPOT data user’s continuity of service, with greater capacity, enhanced image quality and improved services.
A HRS imaging instrument which operates in panchromatic mode
SPECTRAL COVERAGE
Panchromatic
Black &White:
520 nm-900 nm
30 m
Multispectral
Green
500 nm-590 nm
10 m
Red
610 nm-680 nm
10 m
Near Infrared
780 nm-890 nm
10 m
Short Wave infrared
1580 nm-1750 nm
20 m
SPOT-4
SATELLITE SPECIFICATIONS
Launch Date
Operating
Orbit
Flying Height
Orbit Inclination
Operator
March 24, 1998
YES
Polar, Sun-Synchronous
822km
98°
822 km
Astrium and Spot Image
SENSORS
High-resolution visible and infrared (HRVIR) instrument
SPECTRAL COVERAGE
Panchromatic
Black and White
610 nm-680 nm
10 m
Multispectral
Green
500 nm-590 nm
20 m
Red
610 nm-680 nm
20 m
NIR
780 nm-890 nm
20 m
SWIR
1580 nm-1750 nm
20 m
SPOT 2
MISSION
The SPOT 5 satellite was designed to ensure SPOT data user’s continuity of service, with greater capacity, enhanced image quality and improved services.
Spotlight: up to 1m resolution, 10 km (width) x 5 km (length)
StripMap: up to 3m resolution, 30 km (width) x 50 km (length)
ScanSAR: up to 18 m resolution, 100 km (width) x 150 km (length)
WorldView-1
SATELLITE SPECIFICATIONS
Features
Specifications
Highest resolution available commercially 1. 50 cm panchromatic at nadir 2. 55 cm out to 20° off-nadir
Provides highly detailed imagery for precise map creation, change detection and in-depth image analysis (note that imagery must be re-sampled to 50-cm for non-US Government customers)
Allows the creation of accurate maps in remote areas, maximizing the utility of whatever resources are available: 1. Geolocation Accuracy specification of 12.2m CE90, with predicted performance in the range of 3.0 to 7.6 meters (10 to 25 feet) CE90,excluding terrain and off-nadir effects 2. With registration to GCPs in image: 2.0 meters (6.6 feet) CE90
Highest capacity over the broadest range of collection types 1. 17.6 km width imaging swath (wider than any competitor) 2. Bi-directional scanning 3. Rapid retargeting using Control Moment Gyros (>2x faster than any competitor) 4. 2199 gigabits on-board storage 5. 800 Mbps X-band data downlink
Collects, stores and downlinks a greater supply of frequently updated global imagery products than competitive systems 1. DigitalGlobe? ImageLibrary? filled with unrivaled speed 2. Broadest range of collection sizes, without sacrificing capacity from small points to long strips and large areas 3. Stereoscopic areas on a single pass, ensuring image continuity and consistency of quality
Direct downlink to customer sites available using same high-speed 800 Mbps X-band downlink
Expedites image processing and delivery to customers where speed is a driving factor
World-class telescope 1. High contrast (MTF) and signal to noise ratio 2. Selectable Time Delay Integration (TDI) levels 3. 11-bit dynamic range
Extends the range of suitable imaging collection targets and enhances image interpretability, because images can be acquired at even the lowest light levels
Frequent revisits at high resolution 1. 1.7 days at 1 m GSD or less 2. 5.4 days at 20° off-nadir or less (51 cm GSD)
Frequent revisits increase image collection opportunities, enhance change detection applications and enable accurate map updates
Design
Launch Information
Date:18th September, 2007 Launch Vehicle:Delta 7920 (9 strap-ons) Launch Site:Vandenberg Air Force Base
Orbit
Altitude:496 kilometers Type: Sun synchronous, 10:30 am descending node Period: 94.6 minutes
Mission Life
7.25 years, including all consumables and degradables (e.g. propellant)
Spacecraft Size, Mass & Power
3.6 meters (12 feet) tall x 2.5 meters (8 feet) across, 7.1 meters (23 feet) across the deployed solar arrays 2500 kilograms (5500 pounds) 3.2 kW solar array, 100 Ahr battery
Sensor Bands
Panchromatic
Sensor Resolution (GSD = Ground Sample Distance)
0.50 meters GSD at nadir 0.55 meters GSD at 20° off-nadir (note that imagery must be re-sampled to 0.5 meters for non-US Government customers)
Dynamic Range
11-bits per pixel
Time Delay Integration (TDI)
6 selectable levels from 8 to 64
Swath Width
17.6 kilometers at nadir
Attitude Determination and Control
3-axis stabilized Actuators: Control Moment Gyros (CMGs) Sensors: Star trackers, solid state IRU, GPS
Pointing Accuracy & Knowledge
Accuracy: <500 meters at image start and stop Knowledge: Supports geolocation accuracy below
Retargeting Agility
Acceleration: 2.5 deg/s/s Rate: 4.5 deg/s Time to slew 300 kilometers: 9 seconds
Onboard Storage
2199 gigabits solid state with EDAC
Communications
Image and Ancillary Data: 800 Mbps X-band Housekeeping: 4, 16 or 32 kbps real-time,524 kbps stored, X-band Command: 2 or 64 kbps S-band
Max Viewing Angle / Accessible Ground Swath
Nominally +/-40° off-nadir = 858 km wide swath Higher angles selectively available
Per Orbit Collection
331 gigabits
Max Contiguous Area Collected in a Single Pass
60 x 110 km mono 30 x 110 km stereo
Revisit Frequency
1.7 days at 1 meter GSD or less 5.9 days at 20° off-nadir or less (0.51 meter GSD)
Geolocation Accuracy (CE 90)
1.Specification of 12.2m CE90, with predicted performance in the range of 3.0 to 7.6 meters (10 to 25 feet) CE90, excluding terrain and off-nadir effects 2. With registration to GCPs in image : 2.0 meters (6.6 feet)
WorldView-2
SATELLITE SPECIFICATIONS
Features
Benefits
Highest resolution available commercially 1.46 cm panchromatic at nadir 2.52 cm out to 20° off-nadir
Provides highly detailed imagery for precise map creation, change detection and in-depth image analysis (note that imagery must be re-sampled to 50-cm for non-US Government customers)
The most spectral diversity commercially available 1.184 cm resolution at nadir 2.4 standard colors: red, blue, green,near-IR 3. 4 additional colors: red edge, coastal,yellow, near-IR2
Provides the ability to perform precise change detection and mapping at unprecedented resolutions in multispectral imagery, and opens door to creation of numerous new products
High geolocation accuracy 1. Ultra-stable platform, high-precision
Allows the creation of accurate maps in remote areas, maximizing the utility of whatever resources are available: 1.Geolocation Accuracy specification of 6.5m CE90, with predicted performance in the range of 4.6 to 10.7 meters (15 to 35 feet) CE90, excluding terrain and off-nadir effects 2. With registration to GCPs in image: 2.0 meters (6.6 feet) CE90
High capacity over a broad range of collection types 1. 16.4 km width imaging swath (wider than any competitor, slightly narrower than WV-1) 2.Bi-directional scanning 3.Rapid retargeting using Control Moment Gyros (>2x faster than any competitor) 4.2199 gigabits on-board storage 5.800 Mbps X-band data downlink
Collects, stores and downlinks a greater supply of frequently updated global imagery products than competitive systems 1.DigitalGlobe ImageLibrary? filled with unrivaled speed 2.Broadest range of collection sizes,without sacrificing capacity from small points to long strips and large areas 3. Stereoscopic areas on a single pass, ensuring image continuity and consistency of quality
Direct downlink to customer sites available using same high-speed 800 Mbps X-band downlink
Expedites image processing and delivery to customers where speed is a driving factor
World-class telescope 1. High contrast (MTF) and signal to noise ratio 2. Selectable Time Delay Integration (TDI) levels, both panchromatic and mutlispectral bands 3.11-bit dynamic range
Extends the range of suitable imaging collection targets and enhances image interpretability
Frequent revisits at high resolution; improved performance over WV-I enabled by higher altitude (770 vs. 450 km) 1. 1.1 days at 1 m GSD or less 2. 3.7 days at 20° off-nadir or less (52 cm GSD)
Frequent revisits increase image collection opportunities, enhance change detection applications and enable accurate map updates
Design
Launch Information
Date:October 2009 Launch Vehicle:Delta 7920 (9 strap-ons) Launch Site:Vandenberg Air Force Base
Orbit
Altitude:770 kilometers kilometers Type: Sun synchronous, 10:30 am descending node Period: 100 minutes
Mission Life
7.25 years, including all consumables and degradables (e.g. propellant)
Spacecraft Size, Mass & Power
4.3 meters (14 feet) tall x 2.5 meters (8 feet) across, 7.1 meters (23 feet) across the deployed solar arrays 2800 kilograms (6200 pounds) 3.2 kW solar array, 100 Ahr battery
Sensor Bands
Panchromatic + 8 Multispectral: 4 standard? colors:red, blue, green, near-IR 4 new colors: red edge, coastal, yellow, near-IR2
Sensor Resolution (GSD = Ground Sample Distance)
Panchromatic: 0.46 meters GSD at nadir 0.52 meters GSD at 20° off-nadir Multispectral: 1.84 meters GSD at nadir 2.08 meters GSD at 20° off-nadir (note that imagery must be re-sampled to 0.5 meters for non-US Government customers)
Dynamic Range
11-bits per pixel
Swath Width
16.4 kilometers at nadir
Attitude Determination and Control
3-axis stabilized Actuators: Control Moment Gyros (CMGs) Sensors: Star trackers, solid state IRU, GPS
Pointing Accuracy & Knowledge
Accuracy: <500 meters at image start and stop Knowledge: Supports geolocation accuracy below
Retargeting Agility
Acceleration: 1.5 deg/s/s Rate: 3.5 deg/s Time to slew 300 kilometers: 9 seconds
Onboard Storage
2199 gigabits solid state with EDAC
Communications
Image and Ancillary Data: 800 Mbps X-band Housekeeping: 4, 16 or 32 kbps real-time,524 kbps stored, X-band Command: 2 or 64 kbps S-band
Max Viewing Angle / Accessible Ground Swath
Nominally +/-45° off-nadir = 1355 km wide swath Higher angles selectively available
Per Orbit Collection
524 gigabits
Max Contiguous Area Collected in a Single Pass
96 x 110 km mono 48 x 110 km stereo
Revisit Frequency
1.1 days at 1 meter GSD or less 3.7 days at 20° off-nadir or less (0.52 meter GSD)
Geolocation Accuracy (CE 90)
1.Specification of 6.5m CE90, with predicted performance in the range of 4.6to 10.7 meters (15 to 35 feet) CE90, excluding terrain and off-nadir effects 2. With registration to GCPs in image : 2.0 meters (6.6 feet)
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