The NDVI-G was designed on the primary focus of the popular blue filter processing. With the enhancement of green and low NIR makes this filter a great start for NDVI study. This vegetation-sensing filter glass filters out all red light and instead allows the normally blocked near infrared band to be collected. This allows an off-the-shelf camera to be used to collect NIR, Green and Blue light (NGB). With this data, the vegetation index BNDVI can be calculated. This is our #1 selling single filter lens with triple bandpass, sharp curve filter for NDVI professionals.
BNDVI = (NIR - Blue) / (NIR + Blue)
This dual narrow bandpass lens has been designed primarily for NDVI imaging applications. When using a single camera, incorporation of this filter allows reflected red light to be captured in the camera sensor’s red channel and reflected near- infrared light to be captured in the sensor’s blue channel (the green channel is not used). Even when using an inexpensive consumer camera (that has first had its IR blocking filter removed), this easy separation then makes it possible to post-process the red and blue channels for NDVI by performing the calculation: NDVI = (blue – red) / (blue + red). Healthy vegetation will absorb (not reflect) red light and strongly reflect near-infrared light. Thus this information can then be used to apply a false color gradient to images to better highlight the contrast between regions of healthy vegetation vs. areas with stressed/diseased or no vegetation.
This triple narrow bandpass Blue+Green+NIR Filter similar to NDVI-G but with a higher NIR in the 800nm range. Employing three or more cameras or sensors. Blue-Green-Near IR Extended Normalized Difference Vegetation Index (ENDVI) data gathered for vegetative health monitoring can be used to provide similar, but spectrally different information as compared to traditional NDVI data. Soil background, differing atmospheric conditions and various types of vegetation can all influence the reflection of visible light somewhat differently. ENDVI analysis may, at times, be able to impart more accurate or reliable information regarding plant or crop health by additional leveraging of information in the blue portion of the spectrum.
The formula used is: ENDVI = [(NIR + Green) – (2 * Blue)] / [(NIR + Green) + (2 * Blue)]
This triple narrow bandpass lens are primarily designed for aerial agriculture mapping and surveying purposes. Green-Red-Near IR data is used for applications where Chlorophyll Vegetation Index (CVI) and other vegetative index monitoring is preferred. The CVI-6 lens, when mounted in converted consumer RGB cameras, can help in achieving a more affordable, lightweight alternative to systems using three or more cameras or sensors. Some of the formulas that are employed in these cases include: Chlorophyll Vegetation Index CVI = (NIR * Red) / (Green ^ 2) Normalized Green NG = Green / (NIR + Red + Green) Normalized Near Infrared NNIR = NIR / (NIR + Red + Green) Normalised Red NR = Red / (NIR + Red + Green) Triangular Vegetation Index TVI =0.5 * (120 * (NIR – Green) – 200 * (Red – Green)