Multispectral Analysis

This week in Remote Sensing we experimented with multispectral analysis.  Using a LandSat image of western Washington state (my home state!), we attempted to determine what features were causing various spikes on histogram representations of the image.  In the first image, there was a prominent spike at the dark side of Band 4, indicating to me that this must represent all the water in the arms of Puget Sound.  I used TM False Natural Color to best present the water feature.

In the second image, we had smaller spikes in the bright end of the histogram.  This appears to be the snow on the peaks of the Olympic range.  True Color seemed the best representation for white snow.

Finally, some bodies of water appeared lighter and brighter than others. I captured this in the bottom map of Grays Harbor.  We can see that either a lot of sediment or algae is making this image appear lighter.  TM False Color IR really helps this brighter feature stand out in this image.