Reflectance and Sensor Basics

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Presentation transcript:

Reflectance and Sensor Basics

Light and Plant Relationships

Plant Tissue and Reflectance

Plant Tissue and Reflectance VISIBLE NEAR-INFRARED Reflectance Controlled by Leaf Pigments Cell Structure Bare Soil

Active Sensor Basics

Sensor Field of View (FOV)

Data-Plant Relationship GreenSeeker NDVI is measurement of how “green” and how much plant material. Note how size of plant takes up larger percentage of the field of view of the GreenSeeker. Even the same “green-ness” will have effect on NDVI value. Could also be combinations of size and “green-ness”.

Amount of Plant In Field of View 0.40 0.50 0.60 0.70

Vigor of Plant In Field of View 0.40 0.50 0.60 0.70

Data-Plant Relationship GreenSeeker Similar effect with broad acre crop like wheat. Higher plant density/less soil in the FOV of the sensor affects NDVI value.

Hand Held Data Collection Exercise