Lab 7 - Multispectral Analysis

GIS 4035

In this weeks lab we looked at image histograms, how to operate the inquire cursor, interpreting images, utilizing the help function, and interpreting digital data.  When then utilized the skills that we learned in the exercises to properly locate and accentuate a specific location within an image that was provided.  In this case, an image of forest surrounding the Olympic Mountains in Washington State.

The first Figure located was a dark waterbody.  Utilizing near infrared RGB settings to make the water darker, the reader can easily identify the dark waterbodies.  As described in the map the pixel values ranged from 12 and 18 in band 4.  This was observed utilizing the inquire cursor in ERDAS.

The next Figure that I located was the snowcapped mountains.  These features produced pixel values of 200 in the 1-4 band layers.  These features also had a large spike between pixel values 9 and 11 in Bands 5 and 6.  These features can be observed in the image above as yellow.

My final figure was an area of water that layers 1-3 seemed much brighter than normal, with layer 4 become slightly more brighter. Layers 5 and 6 stayed unchanged.  I utilized the band selection to set up 1-3 and then changed the blue band between 5 and 6 to identify the location that the description was illustrating.  In this case the description identified shallow waterbodies that could be seen as a greenish color.