Remote sensing and RVI calculation for Donana
....................................................................................................................................................


     Satellite images from Landsat were provided to calculate the RVI index of Donana Situated
     in the Spanish south west.

     The RVI is a vegetation index and is defined as: RVI = NIR/RED and simply divides
     the nearinfrared reflectance values by the visible red reflectance values ; GIS
    combined with Envi softwares were used for processing & analyzing geospatial imagery.

     The pigments in plant leaves, chlorophyll, strongly absorbs visible light (from 0.4 to
     0.7 Ám) for use in photosynthesis. The cell structure of the leaves, on the other hand,
     strongly reflects near-infrared light (from 0.7 to 1.1 Ám).

     The more leaves a plant has, the more these wavelengths of light are affected,
     respectively. This allows to infrared wavelengths and quantify the photosynthetic
     capacity of the vegetation in a given pixel of land to measure the intensity of light
     coming off the Earth in visible and near- surface.

     As a result some important inputs are highly important for the Envi software:
     float(b4)/float(b3) =NIR/RED.




2012 Maamari. All rights reserved.
HOME    |       EDUCATION    |        PROJECTS     |        CONTACTS     |      WHERE AM I?|        LINKS
Halim Richard Maamari
Water and Landscapes
Image with Pixel on water: Because clear water does not reflect NIR :Pixel on water: float(b4)/float(b3)=0/(something)=0(lowest value) Which is why RGB IS=0 And the clear water area is Dark .
Image with Pixel on Land: Because dense Green fields reflect all NIR and absorb most Red :float(b4)/float(3)=(Maximum)/(Minimum)=Highest value Which is why RGB IS=255 (Highest Value) And the green fields are bright.
Reflectance graph by land cover type.
Irrigation mainline installation.