Identifying Man-Made Materials
Due to the unique way that man-made materials reflect light in the SWIR wavelength, it is possible to tell the difference between materials that look similar to the naked eye in the visible light spectrum. There are many reasons to understand the different types of man-made materials that are present in a particular area. In the images below an oil refinery in Algeria (shown in visible imagery on the left) imaged in SWIR reveals the materials used to construct it (center image) and that there are active flare stacks (right image).
Fighting Fires
Whether called a forest fire, bush fire, or wildfire, uncontrolled fires have a devastating impact on communities and natural resources. Fast and effective detection is key to protecting infrastructure and ensuring communities’ safety. While it seems that fires should be easy to see, there are often obstacles that get in the way. First, smoke obscures what the firefighters can see – both on the ground and from the air. Also, aerial imagery can see only the tops of trees and can give a false impression of how large a fire is on the ground. In the image below on the left, it is easy to see where the smoke is coming from, but can you pick out the ground fire along the fence line? The SWIR image on the right goes through the smoke and highlights the hot spots to show the firefighters which areas they needed to watch.
Minerals and Mining
WorldView-3’s spectral bands allow for precise mineral identification and chemical measurements. Energy from light is either transferred to molecules of matter or reflected away from them. Based on the mineral content, different materials absorb specific wavelengths of light and reflect others. In the images below, visible imagery (left) shows a mining region but does not provide meaningful information about the geology and mineralogy. In the SWIR image (right) geology and mineralogy are clearly distinguishable and enables geologic interpretation.