Re: NDVI analysis

Posted by dllewellyn on Sep 01, 2009; 1:10am
URL: http://imagej.273.s1.nabble.com/NDVI-analysis-tp3691320p3691322.html

<quote author="Angus Jackson">
Hi Christian,

If you can get access to
Murphy RJ, Underwood AJ, Pinkerton MH (2006) Quantitative imaging to measure photosynthetic biomass on an intertidal rock-platform. Mar Ecol Prog Ser 312:45-55
you may find it interesting/useful.

There is also a MS about doing similar measurements with more conventional digital cameras but this is still in review.  Hopefully available soon.

I am a bit uncertain because I am not very familiar with image  
analysis. What is the unit of the brightness value in ImageJ? Is the  
value between 0 and 255 an official brightness value that I can use?  
If yes, I would be set and could do my NDVI calculations.

Thanks to the community for your input.
Christian
******************
Christian,

This is Dan from MaxMax.com.  We have a new camera designed just for vegetation studies.  The camera takes a picture in the infrared and visible band with the differnt bands going to different color channels.  We wrote a quick macro for ImageJ to calculate the NDVI.  Please let me know if you are interested.