The advancement of drones has revolutionized the production of aerial imagery. Using a\ndrone with its associated flight control and image processing applications, a high resolution\northo rectified mosaic from multiple individual aerial images can be produced within just a few\nhours. However, the positional precision and accuracy of any orthomosaic produced should not be\noverlooked. In this project, we flew a DJI Phantom drone once a month over a seven-month period\nover Oak Grove Cemetery in Nacogdoches, Texas, USA resulting in seven orthomosaics of the same\nlocation. We identified 30 ground control points (GCPs) based on permanent features in the cemetery\nand recorded the geographic coordinates of each GCP on each of the seven orthomosaics. Analyzing\nthe cluster of each GCP containing seven coincident positions depicts the positional precision of the\northomosaics. Our analysis is an attempt to answer the fundamental question, â??Are we obtaining the\nsame geographic coordinates for the same feature found on every aerial image mosaic captured by a\ndrone over time?â? The results showed that the positional precision was higher at the center of the\northomosaic compared to the edge areas. In addition, the positional precision was lower parallel to\nthe direction of the drone flight.
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