False Color to NDVI Conversion Precision NDVI Single Sensor
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1 False Color to NDVI Conversion Precision NDVI Single Sensor Contents 1 Sensor Properties Isolating Bands Calculating NDVI from Original Image Pixel DN Calculating NDVI from AgVault s Exported Grayscale NDVI Data... 5 Page 1
2 1 Sensor Properties Figure 1: Spectral Response of Sentera Narrow NDVI The plot above shows the quantum efficiency of Sentera's Precision NDVI Single Sensor. The colors shown in the plot correspond to the colors in the Raw NIR imagery. The "blue" channel contains no blue light, but only NIR light. The "red" channel contains both red and NIR light. The "green" channel is typically unused. Look closely at the plot above and note that Channel 1 is almost exactly aligned with Channel 3 in the nm range. While Sentera sensors are sometimes referred to as NIR sensors or NDVI sensors, the device is measuring the bands shown above, from which it is possible to derive NIR, NDVI, and other values. 2 Isolating Bands The most common use of Sentera s NIR and NDVI sensors is to compute NDVI. In order to do so, it is necessary to isolate the red and NIR bands. The isolation equations account for the difference in sensitivity between bands, and account for crosstalk between bands. In particular, channel 1 contains both RED and NIR light, so the NIR light must be removed to isolate for red. Equation 2-1 RED = 1.0 DN ch DN ch3 Equation 2-2 NIR = DN ch DN ch1 Page 2
3 Where DN ch1 is the Digital Number (pixel value) of channel one, typically assumed to be the red channel by image software, and DN ch3 is the Digital Number (pixel value) of channel three, typically assumed to be the blue channel by image software 3 Accounting for Light Composition The sun and sky provide unequal irradiance in the RED and NIR bands. In general, at the earth s surface, the irradiance of RED varies between 1.3x to 1.7x the irradiance of NIR. Using the average value of 1.5x, it is necessary to normalize the NIR band to the power of the RED band by multiplying the NIR band by 1.5. Which reduces to: NIR = 1.5 (6.403 DN ch DN ch1 ) Equation 3-1 Equation 3-2 NIR = DN ch DN ch1 4 Calculating NDVI from Original Image Pixel DN The standard NDVI equation: Equation 4-1 NIR RED NIR + RED Substitute for RED and NIR, using Equation 2-1 and Equation 3-2: Equation 4-2 (9.605 DN ch DN ch1 ) (1.0 DN ch DN ch3 ) (9.605 DN ch DN ch1 ) + (1.0 DN ch DN ch3 ) Group the terms: Equation 4-3 ( ) DN ch3 ( ) DN ch1 ( ) DN ch3 + ( ) DN ch1 Page 3
4 Reduce: Equation DN ch DN ch DN ch DN ch1 Divide through by to make equation more intuitive: Equation DN ch DN ch DN ch DN ch Which reduces to: Equation DN ch DN ch DN ch DN ch1 The final equation above is the equation used for generating NDVI Data from the Raw NIR images. If original imagery is stitched, the equation above can be applied using any GIS tool s band math calculator to produce NDVI. Page 4
5 5 Calculating NDVI from AgVault s Exported Grayscale NDVI Data AgVault exports three sets of imagery when processing NIR sensor imagery: NIR imagery, NDVI Data, and NDVI Color Mapped. The NDVI value in the NDVI Data files is computed as shown above, but must be converted to an 8 bit integer to be stored as an image for further processing. NDVI values of [-1.0:+1.0] are mapped to [0:255] for storage as an image file, which can be viewed as a grayscale image, but is really intended for quantitative analysis by software. The equation used to produce the DN is: DN = ( NDVI) To compute the NDVI value from pixel DN of NDVI Data files, use the following equation: DN 128 For example DN Equation NDVI * * Note that an NDVI value of is impossible, but may be encountered due to rounding error in integer math used to produce the ND when saving the data image. The coefficient of was chosen to ensure that a value of +1.0 could be represented. Page 5
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