From 0e6663d8a508aec97ab2d771169dd5dccae15eeb Mon Sep 17 00:00:00 2001
From: "Oh, Sungchan" <oh231@purdue.edu>
Date: Thu, 27 Jun 2024 17:57:28 -0400
Subject: [PATCH] Create VI.md

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 resources/VI.md | 145 ++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 145 insertions(+)
 create mode 100644 resources/VI.md

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+- NDVI (normalized difference vegetation index)
+  NDVI = (R800-R670) / (R800+R670)
+  (R800 means reflectance at 800 nm)
+- SRI (simple ratio index)
+  R800 / R670
+- EVI (enhanced vegetation index)
+  2.5 * (R800-R670) / (R800+6*R670-7.5*R490+1)
+- ARVI (atmospherically resistant vegetation index)
+  (R800-2*R670) / (R800+6*R670-7.5*R490+1)
+- SG (sum green index)
+  average reflectance between 500-599 nm
+- reNDVI (red edge normalized difference vegetation index)
+  (R750-R705) / (R750+R705)
+- mRESR (modified red edge simple ratio index)
+  (R750-R445) / (R750+R445)
+- mRENDVI (modifoed red edge NDVI)
+  (R750-R705) / (R750+R705-2*R445);
+* VOG1
+  Vogelmann red edge index 1
+  R740 / R720
+* VOG2
+  Vogelmann red edge index 2
+  (R734-R747) / (R715+R726)
+* VOG3
+  Vogelmann red edge index 3
+  (R734-R747) / (R715+R720)
+* REP
+  Red edge position index
+  Wavelengh in 690-740 nm with highest reflectance
+* PRI
+  Photochemical reflectance index
+  (R531-R570) / (R531+R570)
+* SIPI
+  Structure insensitive pigment index
+  (R800-R445) / (R800+R680)
+* RGRI
+  Red greeen ratio index
+  (Average reflectance between 500-600 nm) / (average reflectance between 600-700 nm)
+* PSRI
+  Plant senescence reflectance index
+  (R680-R500) / R750
+* CAR1
+  Carotenoid reflectance index 1
+  (1/R510) - (1/R550)
+* CAR2
+  Carotenoid reflectance index 2
+  (1/R510) - (1/R700)
+* ANTH1
+  Anthocyanin reflectance index 1
+  (1/R550) - (1/R700)
+* ANTH2
+  Anthocyanin reflectance index 2
+  R800 * (1/R550-1/R700)
+* NBNDVI
+  Narrowband normalized difference vegetation index
+  (R850-R680) / (R850+R680)
+* NRI
+  Nitrogen reflectance index
+  (R570-R670) / (R570+R670)
+* TCARI
+  Transformed chlorophyll absorption and reflectance index
+  3 * (R700-R600-(R700-R550) * (R700/(R850+R670)))
+* PhRI
+  Physiological reflectance index
+  (R550-R531) / (R550+R531)
+* NPCI
+  Normalized pigment chlorophyll ratio index
+  (R680-R450) / (R680+R450)
+* HI
+  Health index
+  (R534-R698) / (R534+R698) - 0.5*R704
+* CLS
+  Cercospora leaf spot index
+  (R698-R570) / (R698+R570) - R734
+* SBRI
+  Sugar beet rust index
+  (R570-R513) / (R570+R513) + 0.5*R704
+* PMI
+  Powdery mildew index
+  (R520-R584) / (R520+R584) + R724
+* IGI
+  Image guided index
+  R1529 / R1416
+* SRC
+  Simple ratio contrast
+  R1459 / R1129
+* WC
+  Weber contrast
+  (R1459-R1129) / R1129 
+* MC
+  Michelson contrast
+  (R1460-R1421) / (R1460+R1421)
+* WBI
+  Water band index
+  R900 / R970
+* MSI
+  Moisture stress index
+  R1599 / R819
+* NDWI
+  Normalized difference water index
+  (R857-R1241) / (R857+R1421)
+* swirNDVI1
+  Shortwave infrared normalized difference vegetation index
+  (R1080-R1460) / (R1080+R1460)
+* swirNDVI2
+  Shortwave infrared normalized difference vegetation index 2
+  (R1080-R1570) / (R1080+R1570)
+* swirNDVI3
+  Shortwave infrared normalized difference vegetation index 3
+  (R1080-R1660) / (R1080+R1660)
+* swirNDVI4
+  Shortwave infrared normalized difference vegetation index 4
+  (R1080-R2180) / (R1080+R2180)
+* TVI
+  Transformed vegetation index
+  abs(NDVI+0.5) / abs(NDVI+0.5) * sqrt(abs(NDVI+0.5))
+* NDGI
+  Normalized difference greenness index
+  (AvgReflectance(500:600)-AvgReflectance(600:700)) / (AvgReflectance(500:600)+AvgReflectance(600:700))
+* RI
+  Redness index
+  (AvgReflectance(600:700)-AvgReflectance(500:600)) / (AvgReflectance(600:700)+AvgReflectance(500:600))
+* MSAVI
+  Modified soil adjusted vegetaion index
+  0.5 * (2*R800 + 1 - sqrt((2*(R800+1)^2)-8*(R800-R670)))
+* VDVI
+  Visible band difference vegetation index
+  Red   = AvgReflectance(600:700)
+  Green = AvgReflectance(500:600)
+  Blue  = AvgReflectance(400:500)
+  VDVI  = (2*Green-Red-Blue) / (2*Green+Red+Blue);
+* NDNI
+  Normalized difference nitrogen index
+  (log10(1/R1510)-log10(1/R1680)) / (log10(1/R1510)+log10(1/R1680))
+* NDLI
+  Normalized difference lignin index
+  (log10(1/R1754)-log10(1/R1680)) / (log10(1/R1754)+log10(1/R1680))
+* NMDI
+  Normalized multiband drought index
+  (R860-(R1640-R2130)) / (R860+(R1640-R2130))
+* NLI
+  Nonlinear index
+  Red = AvgReflectance(600:700)
+  NIR = AvgReflectance(800:1000)
+  NLI = (NIR^2-Red) / (NIR^2+Red)