Comments Off on Assessing Winter Wheat Stands Challenging Growers
A late fall and continued weather issues may test decision-making processes.
At a time of year when most growers would rather be out on the land or at prepping their planters or drills, conditions in the early spring have limited most people to bide their time and manage what they can.
In Eastern Canada, the weather last fall not only made harvesting corn difficult, it also complicated matters for most wheat growers as well, with cool, damp and wet conditions that left wheat stands heading into winter under less-than ideal shape. A slow transition from winter to spring combined with continued cool and rainy weather have many growers considering switching some of their wheat fields to corn or in fewer instances, to soybeans.
The most important thing in assessing wheat fields at this point in the season is for a farmer to get out of the truck and walk the field. Monitoring or making decisions [...]
Comments Off on Working with Multispectral Data in Pix4D and Third-Party Software
Part 1: Introduction to Vegetation Indices and Pix4D
By Jacob Nederend
MSc Candidate, Department of Plant Agriculture, University of Guelph, Guelph, ON, Canada
What is a vegetation index and why can’t I just use NDVI?
In the previous post, I provided a general overview of how to obtain high quality orthomosaics from your eBee’s raw imagery. For agricultural UAV mapping, the last step in that workflow is obtaining reflectance maps from which vegetation indices (VIs) can be calculated. There are numerous resources available online that explain how VIs exploit patterns in the reflectance of visible and near-infrared light, however, a brief definition is the mathematical transformation of at least two spectral bands to enhance the definition of vegetative cover. All of the multispectral sensors currently used for UAV mapping are broadband, with the exception of very expensive and specialized hyperspectral sensors that measure hundreds of narrow bands (<5nm). Since most VIs were developed from broadband [...]
The WINTEX 1000s is an innovative soil sampler which works quickly and effectively in all kinds of soil. It has a hydraulic hammer which, together with pressure from the hydraulic cylinder, ensures that the probe goes into the ground, down to the desired depth. The pressure from the cylinder can be adjusted according to the type of soil, and the depth can be adjusted according to the user’s needs.