Here is an upgrade for the DJI Mavic that turns it into an agricultural drone. The Sentera NDVI integrated with this pocket-sized flying machine provides you with “visual-band RGB, near-infrared (NIR) and normalized difference vegetation index” data.
The 1.2 MP Sentera NDVI Single Sensor allows you to produce crop maps but doesn’t interfere with your drone’s camera. It lets you find problem areas to respond faster. More info is available here.