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Download rain world lush mire9/17/2023 ![]() ![]() Assess the vegetation distribution in Abidjan You first viewed the imagery with the Natural Color with DRA rendering, then switched to the Color Infrared with DRA rendering to visualize the vegetation distribution across the continent. You learned that multispectral imagery is composed of several spectral bands, and that the spectral bands can be combined to obtain various renderings and highlight different features on the ground. In this section, you became familiar with the Digital Earth Africa Explorer app, which allows you to browse satellite multispectral imagery seamlessly over the entire African continent. Learn more about how the GeoMAD layer is created in the DE Africa documentation. Note:Currently, the Sentinel-2 Annual GeoMAD layer in the app contains the year-by-year summary images for the years 2016 to 2019. If necessary, click the Zoom Out button once, to see the entire continent.You'll now learn about the current band combination displayed in the app. Three spectral bands (left) combined into a composite image (right). Some combinations can be particularly good at highlighting specific types of landscape features or properties. There are many possible band combinations and each one shows the imagery differently. One way to use the bands is to choose three of them and to combine them to produce a composite image. Multispectral imagery can provide many interesting insights on the landscape observed. Band 10-Shortwave infrared (SWIR) - Cirrus. ![]() The 13 Sentinel-2 spectral bands are shown on the electromagnetic spectrum.Īnd here is the list of bands with their numbers and names: The following diagram shows where the 13 bands fall on the electromagnetic spectrum. Each of these ranges is called a spectral band, and Sentinel-2 imagery contains 13 such bands. ![]() Some of these wavelength ranges are visible to the human eye, such as blue, green, and red, and some are not, such as near infrared, shortwave infrared, and coastal aerosol. Sentinel-2 produces multispectral imagery, which means that it captures information for several wavelength ranges. Sentinel-2 is an earth observation satellite program from the European Space Agency, which was launched in 2015 and produces high-quality imagery for the entire earth. ![]()
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