An Imaging Vegetation Status Monitoring System
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Why use Red and NIR wavelengths?: PowerPoint PPT Presentation


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An Imaging Vegetation Status Monitoring System Mini Senior Design Project Submitted by Hector Erives August 31, 2005.

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Why use Red and NIR wavelengths?:

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Why use red and nir wavelengths

An Imaging Vegetation Status Monitoring SystemMini Senior Design ProjectSubmitted byHector ErivesAugust 31, 2005


Why use red and nir wavelengths

Objectives:Use of a small computer-camera with color filters arrangement to take images of vegetation.Development of a system that will be unattended for weeks. The system could be powered by a battery or PV cells.The product will be ratio images (2D maps) of a field, of the NIR to Red bands.


Why use red and nir wavelengths

Tools and Methods:A monochrome CCD camera with Red and IR filters (or a wheel filter). Standard CCD cameras: 1024x1024 pixels, 12-bit resolution (4096 DNs). Standard CCD camera lenses. Red filter (650 nm CW), NIR filter (850 nm CW).A PC, Laptop, or a Single Board Computer (SBC) with enough memory to save the images, i.e. Image=(1024x1024 pixels)x12 bits/pixel/8 bits/Byte=1.5 MB. Required: 2 images (Red,NIR) of the scene x 3 images/day. Could save only the Ratio to save memory. i.e. Ratio=NIR/Red


Why use red and nir wavelengths

Tools and Methods:Use MATLAB to manipulate the images, i.e. compute the ratioin a pixel-by-pixel basis, i.e. The product will be ratio images of 1024x1024 pixels.Can also write a program in “C”, Visual Fortran, or IDL to manipulate the images.Save the ratio images to a file with a name so that it differentiates from the rest of the images (from other times and dates), i.e.ratio_9:40_9105, ratio_1:30_9105, …Could use a standard Nickel-Cadmium battery (economic solution) 12 V @ 100 mA – 4A. Can also use Photo-Voltaic (PV) cells but have low efficiency (< 15%).


Why use red and nir wavelengths

Healthy vegetation

Why use Red and NIR wavelengths?:

High DNs

(Reflectivity 1)

Vegetation with lack of

Nutrients (water, fertilizer)

DNs or

Reflectivity

Soil

Low DNs

(Reflectivity 0)

UV(400nm) Red (650nm) NIR(850 nm)

Wavelengths (nm)


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