The NDVI Toolbox® allows you to customize the way you visualize your NDVI data. You can use it to eliminate portions of the NDVI index range that aren't used within the data or to increase the dynamic range of the data you care about. You can also view a histogram of your field's data, which offers you a quick snapshot of field health as a function of acreage.
By default, the NDVI Toolbox displays your NDVI data with an equal area color map made up of 5 "bins". With these settings, your field data is broken into 5 nominally equal-acreage buckets and the index is color-mapped from red to green. This mode enhances NDVI contrast across your field and makes it easy to spot differences.
Inevitably, your drone will capture images of roads, buildings, and equipment that does not need to be considered in your field's NDVI analysis. Conversely, you may also capture imagery of extremely vigorous vegetation adjacent to your fields, such as sloughs, ditches, and buffer areas. You may use the NDVI Toolbox to omit this data from the analysis by adjusting the positions of the left and right sliders.
For example, move the slider on the left until roads disappear, or turn black. The roads will no longer be counted as acreage, or in your overall crop health calculations and statistics. Move the slider on the right until no crops other than your own are green. You've now omitted neighboring vegetation that may be more advanced than your own. What remains is a narrow, zoomed-in view of your field's data, colored from red to green.
Getting more specific, here's another example of things you can do with the NDVI Toolbox. Generally, water measures an NDVI value around -1. For this reason, it can be easily detected and measured. Simply move the right-hand slider to -.75 and leave the left-hand slider at -1. Then, set the bin count to 1. This generally represents the water in your field. Of course, this is simply an estimate and can be affected by other objects in the field. You can tune the position of the righthand slider based on your knowledge of the field, its low spots, and its current condition to refine the estimate.
In the NDVI Toolbox gives the ability to set up Management Zones for building out precision prescriptions. Checking the box for Zone management turns on the functionality. The slide bar will allow the user to determine the level of detail to use in for the zones. If this is your first time, try running the zones at a couple of different levels of detail to understand how this works. Click on the gear icon next to the slide bar to start building management zone polygons. These polygons can then be exported to a folder on your PC, and from there, imported into a number of farm management tools.
Additionally, you can click on the "Rx" icon to build out simple prescriptions and easily export them into your farm management tools.