Abstract
WorldView-3 (WV-3) is a newly launched (August 2014) high-spatial resolution commercial multispectral satellite sensor with eight visible to near-infrared bands (0.42 to 1.04 μ m ) and eight shortwave infrared (SWIR) bands (1.2 to 2.33 μ m ). Previous analyses using hyperspectral imagery (HSI) data of Cuprite, Nevada, to simulate WV-3’s eight SWIR bands demonstrated identification and mapping of a wide variety of minerals, including kaolinite, alunite, buddingtonite, muscovite, calcite, and hydrothermal silica. These results, using partial unmixing, showed mineral occurrences similar to those mapped using full resolution HSI data and established WV-3’s potential as a valuable new mineral mapping tool. Confusion matrix analyses using the HSI data as ground truth did indicate, however, some difficulties with mapping spectrally similar minerals using the multispectral data. Follow-up mineral mapping, using on-orbit WV-3 data acquired September 19, 2014, for Cuprite, Nevada, and the same algorithms and methods used for WV-3 simulation, indicates that the WV-3 sensor is performing as expected. WV-3 SWIR data analyses closely match expectations for mineral mapping as predicted by the simulation. While not as capable as an HSI sensor, WV-3’s carefully selected eight SWIR bands provide new remote mineral mapping capabilities not available from any other spaceborne multispectral system.
Highlights
WorldView-3 (WV-3), launched August 13, 2014, is the latest in a constellation of commercial high-spatial resolution Earth imaging satellites developed by DigitalGlobe Inc. (Longmont, Colorado, USA)
airborne visible/infrared imaging spectrometer (AVIRIS) radiance data collected by the Jet Propulsion Laboratory (JPL) on October 14, 2010, at 3-m spatial resolution for the Cuprite, Nevada, site were used as the starting point for the previously reported WV-3 shortwave infrared (SWIR) simulation and mineral mapping.[12]
Previous simulation using AVIRIS data of Cuprite, Nevada, demonstrated that WV-3 should be able to identify and map selected minerals based on their SWIR spectral properties utilizing spectral matching approaches
Summary
WorldView-3 (WV-3), launched August 13, 2014, is the latest in a constellation of commercial high-spatial resolution Earth imaging satellites developed by DigitalGlobe Inc. (Longmont, Colorado, USA). WorldView-1 (WV-1) was launched in 2007 with a panchromatic (PAN) imaging system capable of 0.5-m spatial resolution.[1] WorldView-2 (WV-2), launched in 2009, provides high-spatial resolution PAN data at a 0.46-m pixel size, plus visible and near-infrared (VNIR) imagery (0.4 to 1.04 μm) at a 1.85-m spatial resolution in eight multispectral bands.[2] WV-3 is an incremental improvement to the previous sensors, delivering essentially the same PAN and VNIR multispectral capabilities (albeit at 0.31- and 1.24-m spatial resolution, respectively).[3] These are supplemented on WV-3 by an additional eight shortwave infrared (SWIR) bands (referred to here as bands S1 to S8) ranging from approximately 1.2 to 2.33 μm at 3.7-m spatial resolution (though currently released only at 7.5-m spatial resolution).[3] The system includes an additional 12 bands “Clouds, Aerosols, Water Vapor, Ice, and Snow” (CAVIS) at 30m resolution for atmospheric compensation Combined, these give WV-3 the distinction of having a total of 29 spectral bands, spanning the VNIR-SWIR range, and being the only commercial high-spatial resolution SWIR multispectral Earth imaging satellite currently in orbit. On-orbit WV-3 SWIR data generally match mineral mapping as predicted by simulation and provide unprecedented high-spatial resolution and multispectral capabilities
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