Introduction Starting this spring 2020 semester at Purdue, I am continuing my capstone course in UAS. Last semester my group began and made great progress in research and experimentation with search and rescue missions aided by UASs. To continue that, we will be doing much more research and analysis this semester, with the goal of writing either a white paper or peer-reviewed publication. Before starting on our literature, we have to answer the question of “what is a white paper?” I’ll be examining that question, analyzing the similarities and differences between a white paper and peer-reviewed literature, and listing pros and cons for each. Finally, I’ll be critiquing a few examples of white papers, and describe how I’ll be moving forward with my writing for the semester. What is a white paper? In short, a white paper is an authoritative document about a complex subject. Purdue’s Online Writing Lab says it is typically used to argue a position or propose a solution to a pr...
Introduction What is Pix4D? Pix4D is a photogrammetry software often used with UAS data for 3D mapping purposes. What products does it generate? Pix4D can be used to create orthomosaic images, terrain and surface models, animated flight paths, and more. These generations require imagery to have at least a 75% frontal overlap, and a 60% side overlap (in more uniform fields these percentages jump up to 85% and 70% respectively). Both nadir and oblique images can be used. However, with oblique images, the sensor angle must be between 0 and 45 degrees and pointing in both track to the center of the corridor. Additionally, multiple flights can be processed together as long as the images have the proper amount of overlap, and meteorological conditions are fairly similar. Ground control points can be used, but are not required, in Pix4D. They can be used as a georeference for the images which will help reduce some of the noise and distortion that can occur in data processing. ...
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