Written by Jason Karl. Edited and updated by Leandro Gonzalez
Agency/Company Operating the Sensor
Worldview 2 is operated by DigitalGlobe – https://www.digitalglobe.com/downloads/WorldView2-DS-WV2-Web.pdf
Worldview 2 was launched on October 8th 2009. This commercial satellite offers eight spectral bands of image information. Panchromatic imagery is collected at half-meter resolution, and multi-spectral information is collected at a ground resolution of 1.8 meters. This satellite offers several additional bands of image information that may be very useful for rangeland applications. These include bands tuned to yellow-edge and red-edge regions of the electromagnetic spectrum and an additional near-infrared band. This is a scheduled-acquisition satellite capable of re-imaging the same spot on the earth approximately every day.
Worldview-2 has a panchromatic band and eight bands to its multispectral sensor. In addition to the standard 4 multispectral bands found in sensors like Quickbird or Ikonos, Worldview-2 has four new bands. The “coastal band” captures wavelengths shorter than standard blue bands. Because it penetrates water better than longer wavelengths, it is designed to assist in mapping aquatic vegetation or bathymetric studies. The yellow-edge band is tuned to the region between the typical green and red bands and is designed to aid in mapping of senescent vegetation. The red-edge band is tuned to the region between red and near-infrared wavelengths and is designed to aid in analysis of vegetation types and plant condition. An additional near-infrared band that is less sensitive to atmospheric conditions will also aid in vegetation mapping.
|7||1.8m||0.77-0.895||Near infrared 1|
|8||1.8m||0.86-1.04||Near infrared 2|
Image footprint or swath width
Worldview 2 has a swath width of 16.4km. Regions wider than this will need to be collected in successive swaths.
Worldview 2 has a positionable sensor that allows the same spot on the earth to be re-imaged every 1.1 days. To do this requires that the sensor collect images at extreme angles off nadir. This can cause problems with shadowing. At off-nadir angles of 20 degrees, Worldview can re-image the same location every 3.7 days.
Worldview 2 was launched on October 8th 2009. Imagery is acquired on demand.
Cost, Acquisition, Licensing
The minimum order amount for any WorldView imagery is $350 USD. Once you submit the area of interest on Digital Globe’s website, you will receive a price estimate online and a member of Digital Globe’s team will contact you to confirm the details and deliver final pricing for the imagery you need. You can contact Digital Globe at 303-759-5050 x 2 with any questions.
Because WorldView-2 is commercially operated, there are some licensing restrictions regarding image usage and sharing. Please consult with DigitalGlobe to get the level of licensing that is appropriate for your research or project.
WorldView-2 Imagery can be acquired in the following formats: Geo TIFF, JPEG, NTIF
Examples of Rangeland Uses
Laliberte et al. (2011) describe challenges and solutions associated with efficient processing of multispectral imagery to obtain orthorectified, radiometrically calibrated image mosaics for the purpose of rangeland vegetation classification.
Geotiff images often come as one band per file. For the purposes of making it easier to handle, manipulate, and display the imagery, most people combine all of the separate image bands into a single, multi-band image file using an image-processing package. The size of the files will depend on the extent of the scene, but because of its fine resolution WorldView-2 data can be very large (2.5 GB or more).
- https://www.digitalglobe.com/downloads/WorldView2-DS-WV2-Web.pdf – general information on the Worldview 2 satellite
Laliberte A, Goforth MA, Steele CM, and Rango A. 2011. Multispectral Remote Sensing from Unmanned Aircraft: Image Processing Workflows and Applications for Rangeland Environments. Remote Sensing 3:2529-2551.