Public Lab Wiki documentation

Image Analysis

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Infrared compositing

If you have near-infrared imagery you can composite that imagery with the visible-light imagery to see how healthy the vegetation is.

Contrast adjustments

Stretch the contrast and saturation of your images to see more detail, especially underwater. Read more here:

Decorrelation stretching

Nathan Craig writes: Decorrelation stretching may be a method to consider. Various flavors of the transformation are easily run using the DStretch Plugin for Image J. Several that seemed to represent variability relevant to the case study are included. I use DStretch to help bring out detail in rock art scenes that are highly eroded. However, the method has utility outside of rock art studies. It may be an additional approach to consider when trying to identify pollution or other contaminants.

Here is information on DStretch

Here is a paper that describes the transformation

Fwd: contrast enhancement to view underwater features in aerial photos

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Using the ratios of Red, Green, and Blue (and possibly Near-infrared), spectral classification attempts to categorize regions of an image by land type.

Read more on the classification page »

how much oil hit the coast ?

Image Analysis

Activities should include a materials list, costs and a step-by-step guide to construction with photos. Learn what makes a good activity here.