WorldView II Specifications
WV2

Features

Benefits
Highest resolution available commercially
  • 46 cm panchromatic at nadir
  • 52 cm out to 20º 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
  • 184 cm resolution at nadir
  • 4 “standard” colors: red, blue, green, near-IR
  • 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
Industry-leading geolocation accuracy
  • Ultra-stable platform, high-precision attitude sensors and GPS
  • Accuracy Transfer Service (ATS) uses Ground Control Points (GCPs) near, but not in the image
Allows the creation of accurate maps in remote areas, maximizing the utility of whatever resources are available:
  • Without GCPs: 8.5 to 10.7 meters (27.9 to 35.1 feet) CE90
  • With GCPs: 2 meters (6.6 feet) CE90
  • With ATS: 4.6 to 5.5 meters (15.1 to 18 feet) CE90
Highest capacity over the broadest range of collection types
  • 16.4 km width imaging swath (wider than any competitor, slightly wider than WV-I)
  • Bi-directional scanning
  • Rapid retargeting using Control Moment Gyros (>2x faster than any competitor)
  • 2199 gigabits on-board storage
  • 800 Mbps X-band data downlink
Collects, stores and downlinks a greater supply of frequently updated global imagery products than competitive systems
  • DigitalGlobe ImageLibrary filled with unrivaled speed
  • Broadest range of collection sizes, without sacrificing capacity – from small points to long strips and large areas
  • 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
  • High contrast (MTF) and signal to noise ratio
  • Selectable Time Delay Integration (TDI) levels, both panchromatic and mutlispectral bands
  • 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; improved performance over WV-I enabled by higher altitude (770 vs. 450 km)
  • 1.1 days at 1 m GSD or less
  • 3.7 days at 20º off-nadir or less (52 cm GSD)
Frequent revisits increase image collection opportunities, enhance change detection applications and enable accurate map updates

Design and Specifications

Launch Information

 Date: Launched October 8, 2009
Launch Vehicle: Delta 7920 (9 strap-ons)
Launch Site: Vandenberg Air Force Base

Orbit

 Altitude: 770 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 20º off-nadir
Multispectral:   1.84 meters GSD at nadir
                        2.08 meters GSD at 20º 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)

 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

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 +/-45º off-nadir = 1355 km wide swath
Higher angles selectively available

Per Orbit Collection

 524 gigabits

Max Contiguous Area
Collected in a Single Pass

 64 x 64 km (equivalent to 4 x 4 square images)
32 x 32 km (equivalent to 4 x 4 square images)

Revisit Frequency

 1.1 days at 1 meter GSD or less
3.7 days at 20º off-nadir or less (0.52 meter GSD)

Geolocation Accuracy
(CE 90)

 Without GCPs: 8.5 to 10.7 meters (27.9 to 35.1 feet)
With GCPs: 2 meters (6.6 feet)
With ATS: 4.6 to 5.5 meters (15.1 to 18 feet)


ImStrat Corporation Toll Free number in Canada or the United States:
1-877-269-5940
imstrat@imstrat.on.ca