This exercise allows you to identify a few known surface features and see their spectral reflectance curves. Two image windows should have appeared on your screen. The background image is a portion of a TM scene from the Los Angeles area. Image area within the green rectangle in the Overview Window is enlarged to its full resolution in the large window. You can move the green rectangle to view different part of the image.
Surface features like water, green vegetation, pavement and others have unique spectral reflectance.
You are asked to locate a few of these features in the image and study their reflectance characteristics.