What is NDVI?
NDVI stands for, Normalized Difference Vegetation Index. It is a simple graphical indicator that can be used to analyze remote sensing measurements, typically but not necessarily from a space platform, and assess whether the target being observed contains live green vegetation or not. Of course, with the wonderful changes in technology these days, these measurements can also be gotten with the use of an Unmanned Aerial System, or drone.
As the drone flies over the prescribed area it travels on a very specific path and at a specific altitude, all the while taking a photograph every 2 seconds. The result is a large, very high resolution 2D image that is stitched together to create a very useful overview of the entire property. At that point we can generate the NDVI so the farmers can see what is happening with their crops so they can determine what to do to increase their yield, and their profits!
Below, the enlarged photo on the left is the actual photo taken by the drone. The photo on the right is the same photo after it has been run through our software program. As you can see by the red vs. green areas, it has not only picked up the spot where no seed was dropped, but it also shows the inconsistency of the height of the corn rows, which in this case is being blamed on the ground being too wet when the farmer planted.
Depending on the size of the fields, we can normally have the results back to the farmer the very next day.
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