NDVI Calculation
Good example in GDAL/Python: http://www.gis.usu.edu/~chrisg/python/2009/lectures/ospy_slides5.pdf
Script for GDAL: http://www.jeremymsmith.us/davidson/NDVI.py
Remember, NDVI is:
Infrared - Visible / Infrared + Visible
GDAL commands
splice out a single band and save as independent geotiff:
gdal_translate -of GTiff -b 2 morflex-freeflight-geo.tif morflex-freeflight-green.tif