Update #1 NDVI Data Collection
We met with Jnaneshwar Das (JD), our customer for Barn Owl, to discuss the state of the greenhouse and previous progress. JD suggested we use NDVI (https://en.wikipedia.org/wiki/Normalized_Difference_Vegetation_Index) to measure whether our plants were stressed or healthy, and so we’ve spent some time collecting data on healthy and unhealthy leaves to determine if NDVI will work for our project. Below you’ll see the leaves we used for our data collection:
From left to right, the samples are two leaves from a citrus tree with fruit, two leaves from a citrus tree without fruit, and two leaves that had fallen off the plant (assumed to be a good analog for “unhealthy”). Below is a sample of the spectrometer data we collected:
The spectrum shown is for healthy leaf from a tree with fruit. We are in the process of purchasing camera filters and doing an NDVI calculation using cameras as well. We plan to use a two camera setup for our final implementation, but this initial data collection will serve as a proof of concept.
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