From the DARWin SP screen, the 19 vegetation indices including NDVI are
accessed via a pull down menu.
Broadband and narrowband greenness
based vegetation indices
 First in Full Range PDA Spectrometer, Spectroradiometer and Spectrophotometer Systems
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Broadband greenness measures the health of vegetation by
comparing strong reflective properties in NIR wavelengths (700-
1300nm) with the strong absorption features in the red wavelengths.
These vegetation indices include NDVI (Normalized Difference
Vegetation Index), EVI (Enhanced Vegetation Index), and ARVI
(Atmospherically Resistant Vegetation Index). NDVI normalizes green
leaf scattering in the NIR and chlorophyll absorption in the red. EVI
uses information in the blue wavelength to improve NDVI in areas of
dense canopy by correcting background noise and atmospheric
influence. ARVI is resistant to atmospheric influences.

Narrowband greenness measures the overall amount and quality of
photosynthetic material in vegetation. The vegetation indices in this
group use reflectance bands in the red and NIR to sample the red
edge portion of the spectra. The red edge is the steep slope
between 690nm and 740nm caused by the transition from chlorophyll
absorption to NIR leaf scattering (increased reflectance). Indices
include GRVI (Green Ratio Vegetation Index), Red/Green Ratio,
Green NDVI (Green Normalized Difference Vegetation Index), and
NDVI705 (Red Edge Normalized Vegetation Index). These indices
incorporate red edge data with a leaf specular correction.

Spectral Evolution field portable spectroradiometers run DARWin SP
Data Acquisition software with  access to more than 19 vegetation
indices through pop-up menus. Researchers can select those
indices that will work best for the measurements they want to take
and the vegetation characteristics they need to identify and monitor.

Spectral Evolution field spectroradiometers for remote sensing
applications include:
  • PSR + full range (350-2500nm) high reslution/high sensitivity
    spectroradiometer with swappable direct attach lenses or fiber
    optic cable for use with FOV lenses, leaf clip, contact probe,
    diffuser and other accessories
  • RS-3500 remote sensing bundle with fiber optic cable
    connection for leaf clip, FOV lenses, contact probe and  other
  • PSR-1100F lightweight portable spectroradiometer with 320-
    1100nm range
 First in Full Range PDA Spectrometer, Spectroradiometer and Spectrophotometer Systems
The PSR+ 3500  is a field portable spectroradiometer for
remote sensing applications including vegetation studies. With
DARWin SP Data Acquisition Software included, it provides
instant access to 19 vegetation indices for your research.
PSR-Series spectroradiometers provide access to 19 vegetation indices
PSR+ field spectroradiometer for vegetation studies
From the DARWin SP screen, a scan showing the distinctive red
edge in vegetation spectra. The size, shape and wavelengths
where the red edge is positioned can provide important
information on plant species identification and plant health.