Module 7 Lab Assignment: Multispectral Analysis

Learning goals of this lab are as follows:

• Explore Image Histograms
• Operate the Inquire Cursor
• Interpret histogram data in images
• Utilize the “Help” menu effectively to locate ERDAS functions
• Identify features by interpreting digital data

Three maps were produced for the exercise - a good tip was to use the same map tempate and then swap out the .img file each time.  I did finally seem to figure out a way to deal with the text boxes.  I'm not particularly happy with the legends; I don't think they add much except the bands that I used. 

Although the legend might be confusing on it, the one I'm particularly happy with is the image of the glaciers in Map 2. It's really interesting to me that thermal imaging would show a glacier so well.  

Map 1: This shows a heavily forested, protected area adjacent to less heavily forested, unprotected lands.

Map 2: My intuition was these dark areas were glaciers - sure enough, Google Maps told me this was "Glacier Pass."

Map 3: A bay on coastal Washington - I am unsure if the coloration is from phytoplankton or from sediment coloration.

Module 6 - Image Preprocessing 1: Spatial Enhancement and Radiometric Correction

Learning objectives for this lab include:

• Spatial Enhancements
• Pan-sharpening
• Spatial filtering
• Skills demonstrated in this lab include:

• Download and import satellite imagery
• Perform spatial enhancements in ArcMap and ERDAS
• Utilize the Fourier Transformation function

For this lab we used ERDAS Imagine to modify data. There is a file called l7_striping.img.

I'm not aware of metadata explaining exactly what it is depicting, but it's in UTM zone 16N. Datum is WGS 84.  Usually it is related to West Florida - this makes sense since Tennessee is in zone 17N, and West Florida is West of (Eastern) Tennessee.

I want to include a "before" photo - in ERDAS I saved the file as a "JP2" and then opened the JP2 in Corel Draw that happened to be the one suggested program that could handle a "JPEG 2000" file.

"Before" Image of Landsat 4-5 TM data with swaths

Map 1: "After" image enhancement.  I had wanted to put a text box describing this but ended up having formatting problems. Will need to explore this further!

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