How To Use The TerrAvion NDVI Zone Creation Tool
The TerrAvion NDVI zone creation tool allows users to turn an NDVI map into a management zone shapefile that can be imported into most precision ag programs. Customize your zoning maps by choosing the number of zones in your map and the grid size for your zones. While TerrAvion is integrated with a growing number of precision ag platforms, TerrAvion users have found the option to create their zoning maps in the OverView platform as a convenient intermediate step to making variable rate prescriptions in their precision ag platforms. Please note that the TerrAvion zone creation tool is only a preparatory step for the variable rate treatment process, and users must work in a third-party precision ag platform to build their prescriptions.
How to Create a TerrAvion NDVI Zoning Map In OverView
1. Choose the NDVI image for which you would like to base your variable rate treatment off of. In most cases, you will use the most recent NDVI image for in-season treatments. If you wish to make a zoning map for variable rate seeding or preplant nutrient/chemical applications, refer to your most recent NDIV imagery from the previous year.
2. Once you have selected the NDVI image for which you would like to create a zoning map, click the Zone Creation button.
3. In the zone creation window, chose the number of zones and grid size for your zoning map. (Note: zoning maps for images that have a high percentage of outlier values, such as soil values, may not populate into the number of zones you wished to see. In these cases, try adding another zone or two to allow you to isolate the outlier values.)
4. Click on the down arrow next to Basic Mode to turn on the Advanced Mode. In the Advanced Mode, you have the ability to turn on the Filter Minimum Region and include the filed buffer. Turn on the Filter Minimum Region toggle to exclude small, outlier zones in your zoning map. You can change the size of zones you wish to exclude.
5. The NDVI Zoning tool will automatically exclude the vigor values around the edges of your field so that they do not contaminate the calculation of your NDVI management zones. You can turn this feature off by checking the box next to Include Buffer.
6. Click Calculate Zone and wait for the zoning map to load.
7. After the zoning map loads, in the zone creation window, you can make notes about how you plan to act on each NDVI zone and can also turn off each zone if you wish to not see them.
8. To download a shapefile of your zoning map, click Next
9. On the next page, you can change the export file name and also choose to include vigor values for your NDVI zone shapefile. Click export to download the shapefile.
10. Save the file with a name that’s easy to remember and a location that’s easy to find.
11. Upload shapefile into your precision ag program to make a variable rate treatment prescription.