PolyPen RP 410 Leaf Analyzer for calculating commonly used reflectance indexes (NDVI, NDGI, PRI, etc.)

PolyPen RP 410 features a complete system for measurement of spectral reflectance from leaves. The device is equipped with an internal light source (Xenon incandescent lamp 380 - 1050 nm) and with one type of detector (UVIS or NIR, read more in Versions).

Polypen RP 410 incorporates formulas of commonly used reflectance indices (e.g. NDVI, NDGI, PRI etc.) and enables programming customized indices. Measured data are instantly displayed in graphs or data sheets on the device screen display. They are also stored as full spectrum in the device memory for later re-collection or transfer onto a PC. Li-Ion rechargeable battery, splash-proof case and integrated GPS module make PolyPen RP 410 an ideal tool for field experiments.

POLYPEN MEASURES

Absorbance - calculated data using the following formula
A=log(I0/I), where I0 is reference light intensity and I is measured light intensity
Transmittance - calculated data using the following formula
T= I/ I0, where I0 is reference light intensity and I is measured light intensity

LIST OF CALCULATED VEGETATION INDICES
· Normalized Difference Vegetation Index (NDVI)▪
Reference: Rouse et al. (1974) Equation: NDVI = (RNIR - RRED ) / (RNIR + RRED )
· Simple Ratio Index (SR)▪
Reference: Jordan (1969); Rouse et al. (1974) Equation: SR = RNIR / RRED
· Modified Chlorophyll Absorption in Reflectance Index (MCARI1)
Reference: Haboudane et al. (2004) Equation: MCARI1 = 1.2 * [2.5 * (R790- R670) - 1.3 * (R790- R550)]
· Optimized Soil-Adjusted Vegetation Index (OSAVI)▪
Reference: Rondeaux et al. (1996) ) Equation: OSAVI = (1 + 0.16) * (R790- R670) / (R790- R670 + 0.16)
· Greenness Index (G)
Equation: G = R554 / R677
· Modified Chlorophyll Absorption in Reflectance Index (MCARI)
Reference: Daughtry et al. (2000) Equation: MCARI = [(R700- R670) - 0.2 * (R700- R550)] * (R700/ R670)
· Transformed CAR Index (TCARI)
Reference: Haboudane et al. (2002) Equation: TSARI = 3 * [(R700- R670) - 0.2 * (R700- R550) * (R700/ R670)]
· Triangular Vegetation Index (TVI)
Reference:Broge and Leblanc (2000) Equation: TVI = 0.5 * [120 * (R750- R550) - 200 * (R670- R550)]
· Zarco-Tejada & Miller Index (ZMI)▪
Reference: Zarco-Tejada et al. (2001) Equation: ZMI = R750 / R710
· Simple Ratio Pigment Index (SRPI)
Reference: Peñuelas et al. (1995) Equation: SRPI = R430 / R680
· Normalized Phaeophytinization Index (NPQI)
Reference: Barnes et al. (1992) Equation: NPQI = (R415- R435) / (R415+ R435)
· Photochemical Reflectance Index (PRI)
Reference: Gamon et al. (1992) Equation: PRI = (R531- R570) / (R531+ R570)
· Normalized Pigment Chlorophyll Index (NPCI)
Reference: Peñuelas et al. (1994) Equation: NPCI = (R680- R430) / (R680+ R430)
· Carter Indices
Reference: Carter (1994), Carter et al. (1996) Equation: Ctr1 = R695 / R420; Ctr2▪ = R695 / R760
· Lichtenthaler Indices
Reference: Lichtenthaler et al. (1996) Equation: Lic1▪ = (R790 - R680) / (R790 + R680); Lic2 = R440 / R690
· Structure Intensive Pigment Index (SIPI)
Reference: Peñuelas et al. (1995) Equation: SIPI = (R790- R450) / (R790+ R650)
· Gitelson and Merzlyak Indices
Reference: Gitelson&Merzlyak (1997) Equation: GM1 = R750/ R550; GM2 ▪= R750/ R700

▪Indices measured also by PolyPen NIR