What We Provide
We supply aerial measurements for crops to create field health reports containing elevation, NDVI and NDRE maps that can then be used by farm management as follows:
How It Works
Vegetation analysis using the NDVI measure was first formulated as part of the NASA Landsat program back in 1972. Using a multispectral scanner mounted on a satellite, researchers found a correlation between the received signals and the biophysical characteristics of the vegetation. In particular Red Edge (RE) and Near Infra-Red (NIR) light were found to be reflected more dominantly in healthy vegetation. These light frequencies are not visible by the human eye and the perception of a green crop as healthy is not always true.
Today technology has evolved far enough that multispectral cameras can be mounted on board small drones. These can be flown in an automated grid formation while capturing imagery to create a layered orthomosaic map of different light frequencies.
A drone mapping mission results in several hundred images that must then be matched and combined to create a georeferened orthomosaic map. To do this operation we use industry leading software Pix4D Mapper Pro. This creates four map layers of interest to agriculture. The orthomosaic layer is the stitched visible layer taken during the survey. This is used to create a digital terrain model to show elevation changes. The multispectral ‘index’ layers can be combined mathematically in different ways to create NDVI and NDRE index maps representative of crop health.