Introduction What is photohrammetry? Photogrammetry is utilized with mapping to help measure distances between objects and defining the location of a point in space. What types of distortion does remotely sensed imagery have in its raw form? Distortion occurs in remotely sensed imagery due to the fact that a two-dimensional image is being taken of a three-dimensional object. Objects seen directly from above will have no depth, whereas objects far from the center of the lens will appear to ben outward slightly. This problem becomes more noticeable the further away from the center of the image the object is. What is orthorectification? What does it accomplish? Orthorectification is a process that attempts to remove the negative effects (distortion as mentioned above) of an image. It can solve the issue of the tilting that happens in images to create a correct, more accurate representation of the space. ...
Through the first semester of my UAS Capstone course, AT 409, the ultimate goal of our research was to be able to present a poster for Purdue's annual GIS Day Conference. On November 7, 2019 we did just that. This conference has been held annually for more than a decade, and serves as an opportunity for students, faculty, and members of industry to come together and learn from each other. The day started with a few lightning talks, 15 minute presentations from students and faculty presenting their current research. Topics ranged from GIS usage for UAS mission planning, to forest communities migrating due to climate change. These presentations were very insightful and put together incredibly well. The main event of the day was the keynote presentation, Seeing a Better World from Space by Dr. Carly Sakumura. Dr. Sakumura is a research and development scientist at Maxar Technologies, a company based around satellites and earth observation. The presentation focused on the...
Introduction What is Image Annotation? Image annotation is the process of removing unwanted parts of an image from the ray cloud. For example, in the first data set used for this lab we wanted to isolate the truck from the rest of the image. Using image annotation we are able to remove the pavement and other parts of the image to leave just the truck. At what phase in the processing is this performed? Image annotation is performed after the first step, Initial Processing, has been completed, but before the second step has been completed. What types of Image Annotation are there? There are three types of image annotation: Mask, Global Mask, and Carve. Mask annotation would be used for removing an obstacle that appears in a few images, such as scaffolding or tree branches. Global Mask annotation would be used when there is a consistent obstacle between all of the images, such as if the landing gear or propeller from the UAV was in view of the camera lens. Carve...
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