WorldView-2 Satellite Sensor (0.46m)

DigitalGlobe's WorldView-2 satellite sensor, launched October 8, 2009, provides 0.46m panchromatic (B&W) mono and stereo satellite image data.

The WorldView-2 sensor provides a high resolution panchromatic band and eight (8) multispectral bands; four (4) standard colors (red, green, blue, and near-infrared 1) and four (4) new bands (coastal, yellow, red edge, and near-infrared 2), full-color images for enhanced spectral analysis, mapping and monitoring applications, land-use planning, disaster relief, exploration, defense and intelligence, and visualization and simulation environments.

With its improved agility, WorldView-2 is able to act like a paintbrush, sweeping back and forth to collect very large areas of multispectral imagery in a single pass. WorldView-2 alone is able to collect nearly 1 million km2 every day, doubling the collection capacity of our constellation to nearly 2 million km2 per day. The combination of WorldView-2’s increased agility and high altitude enables it to typically revisit any place on earth in 1.1 days, revisit time drops below one day and never exceeds two days, providing the most same-day passes of any commercial high resolution satellite.

The WorldView-2 imaging payload is the second such system engineered and manufactured by ITT Space Systems Division for DigitalGlobe. WorldView-2 operates at an altitude of 770 kilometers, and the advanced on-board imaging system can capture pan-sharpened, multispectral images (with better than 0.46-meter resolution) from almost 500 miles above the earth. These images supply unprecedented detail and geospatial accuracy, further expanding the applications for satellite imagery in both commercial and government markets. Added spectral diversity provides the ability to perform precise change detection and mapping.

In addition to numerous other technical improvements, WorldView-2 also has the ability to accommodate direct tasking, which will allow select customers around the world to load imaging profiles directly up to the spacecraft and execute delivery of the data directly down to their own ground stations.

WorldView-2 Satellite Sensor Specifications

Launch Date October 8, 2009
Launch Vehicle Delta 7920 (9 strap-ons)
Launch Site Vandenberg Air Force Base
Orbit Altitude 770 kilometers
Orbit Type Sun synchronous, 10:30 am (LT) descending Node
Orbit Period 100 minutes; 7.25 year mission life, 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, 2.4 meters GSD at 20° Off-Nadir
Dynamic Range 11-bits per pixel
Time Delay Integration (TDI) Panchromatic - 6 selectable levels from 8 to 64
Multispectral - 7 selectable levels from 3 to 24
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 Position Accuracy & Knowledge < 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 +/-40° 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 Demonstrated <3.5 m CE90 without ground control

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