Spectral Analysis for Fire Demo

For this tutorial, we'll use Maplicity's band analysis tool, and use
an NDVI style analysis to highlight the burn region (please review
the Spectral Analysis page to see what information this analysis
yields, and what bands actually make up an NDVI analysis).

First select the true color and false color composites for
10/19/2002 (either when launching the Change Bands tool
from the menu, or when loading different images
from the Load menu item, and then selecting Change
Bands from the Maplicity Extension window menu):

* Top: Date: 20021019, Band b457
* Bottom: Date: 20021019, Band b321

Then adjust the combo boxes at the bottom to select a 5-4-3 band
combination, assigned to the Red, Green, and Blue channels,
respectively, to perform the NDVI analysis. But what does this mean
exactly?

For this example, to obtain band 5, we see that band 5 is included in
the top image, at the second position. So, for the Red channel, use
Top, Band 2.

Likewise, to obtain band 4, we see that band 4 is also
included in the top image, but at the first position. So, for the
Green channel, use Top, Band 1.

However, to obtain band 3, this particular band is now found in the
bottom image, at the first position. So for the Blue channel, use Top, Band 1.

In summary, the combo boxes should be adjusted the following way:

Red Channel: Top, Band 2
Green Channel: Top, Band 1
Blue Channel: Bottom, Band 1

The burn region shows up fairly well in magenta. Go ahead and try the
same analysis for the true and false color composites on
8/16/2002. The same region doesn't show up as magenta, which makes
sense, since the scene was acquired before the Cone fire.

Feel free to try different combinations of images and bands. To
interpret what the variations in colors mean, refer back to the
Band Applications page.


Click the following link for some concluding remarks.
Concluding Remarks