This week's lab focused on learning how to read and understand histograms, and understanding how to identify spectral characteristics of various features.. We also explored various band combinations that would highlight certain features within an image. Below are three examples.
The first feature we were to identify had a spike in Layer 4 between pixel value 12 and 18. These low numbers indicate that the feature absorbs rather than reflects EMR, and this image clearly shows that characteristic, especially when the colors are manipulated so that the water is especially dark, contrasted with the light green vegetation and pink/red ground.
The second feature we were looking for had to satisfy two different criteria - a spike in pixel values around 200 in Layers 1-4, indicating high reflectivity, and a spike in pixel values between 9 - 11 in Layers 5 & 6. The snow-capped mountains have this pattern. A bright, nearly electric blue makes this feature stand out.
Variations in this water feature are highlighted by using a band pattern that allows the vegetation to remain muted. Attention is then focused on the variations in the water, showing sediment buildup and a clear channel leading out to a larger body of water.
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