Selecting the Actual Channels

Now we're ready to select the channels for our product. Of the combinations below, which would produce the 'best natural' RGB product, one that emphasizes features such as topography, vegetation, and snow cover? (Choose the best answer.)

Note that for readability, we've removed the micrometer symbols following each channel's wavelength.

The correct answer is D.

The 0.6 µm Vis, 0.8 µm Vis, and 1.6 µm NIR (Near InfraRed) channels represent solar wavelengths that are effective for characterizing terrain and land cover features. Most of the other channels sense at shortwave, midwave, and longwave infrared wavelengths, only some of which can be used to detect surface features.