The NDRE (Normalized Difference Red Edge Index) is used to measure the light waves (approximately the 715 nm range of the spectrum) that are collected from multispectral image sensors. The images are processed and analyzed to determine how healthy the target crop and field is. It is very similar to the NDVI vegetation index it
ENDVI uses blue and green visible light instead of solely using red light. This index singles out plant health indicators better because it shows how the plant’s surface absorbs the blue light in contrast to the reflected green light and the NIR light, thus it generates a more reliable sign of the crop’s health. The
GRVI is another one of the vegetation indices that uses information from visible light range of the spectrum to determine the phenology present in a crop field. This index is calculated from the green and red light reflectance. The method involves a time series of GRVI readings to show the timing of greening-up to autumn-coloring.
VARI was originally designed for satellite imagery. It is a vegetation index the uses only light waves from the visible light section of the spectrum (Red, Green, Blue). It puts a quantitative value on vegetative fraction estimation (VARI = (Green – Red) / (Green + Red – Blue). The index is only affected by atmospheric
An IMU sensor is a digital device that measures and records an Unmanned Aerial Vehicles’s acceleration, angular rate, and orientation in order to maneuver it. The IMU uses a conflation of accelerometers, gyroscopes, and magnetometers to achieve the measuring process. Recent developments in this area has allowed for IMU-enabled GPS (Global Positioning System) devices as
NDVI (Normalized Difference Vegetation Index) is a graphical display that represents the results from images that were captured with a multispectral sensor during a remote unmanned vehicle survey mission and analyzed for the presence of live green plant life. Thus, NDVI information will bear out a measure for crop health. Learn More (Last Edit: 18
NTRIP (Network Transport of RTCM via Internet Protocol) is a communication protocol that allows synchronization between an UAV and a base station so corrections for location positioning can occur in real-time during a survey flight. The protocol streams DGPS (Differential Global Positioning) to enhance the available GNSS (Global Navigational Satellite Systems) which dramatically increases the
A Geographic Information System(GIS) is a computer application that is setup to gather, store, and examine data that corresponds to specific location position on the earth’s surface. It can also display this information for the user in the form of maps so that one can view, analyze, and recognize relational patterns that will help them
This is a process where the GPS data and the images that were obtained during an aerial flight from a drone mission are processed alongside data at the ground base station after the flight is completed instead of during the flight (or real-time). It is used to correct the location data in the images. Learn
RTK (real-time kinematic) positioning is a function that can be applied during an aerial survey to correct for errors in location positions of GPS or GNSS, or satellite navigation systems. The information being gathered by the unmanned drone is sent to a ground base station where real-time corrections are applied. Wikipedia RTK