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Thomas, Orrin

Publications and source records attributed to Thomas, Orrin.

3 records
All sourcesNASA NTRSDOE OSTI
DOE OSTI2024

Oak Ridge National Laboratory Bundle Adjustment of Maxar WorldView and GeoEye Imagery

Since the 1950s, bundle adjustment has been used to correct the geopositioning of imagery. With the increased availability of very high resolution satellite imagery, bundle adjustment has become an increasingly critical topic for both researchers and practitioners. Many studies have explored the bundle adjustment of satellite imagery from Maxar sensors, including the WorldView and GeoEye sensors. In this work, we review some of the recent and relevant literature pertaining to this topic.

47 OTHER INSTRUMENTATION↗
DOE OSTI2023

UAS Edge Computing of Energy Infrastructure Damage Assessment

Energy infrastructure assessments are needed within 72 hours of natural disasters, and previous data collection methods have proven too slow. We demonstrate a scalable end-to-end solution using a prototype unmanned aerial system that performs on-the-edge detection, classification (i.e., damaged or undamaged), and geo-location of utility poles. The prototype is suitable for disaster response because it requires no local communication infrastructure and is capable of autonomous missions. Collections before, during, and after Hurricane Ida in 2021 were used to test the system. The system delivered an F1 score of 0.65 operating with a 2.7 s/frame processing speed with the YOLOv5 large model and an F1 score of 0.55 with a 0.48 s/frame with the YOLOv5 small model. Geo-location uncertainty in the bottom half of the frame was ~8 m, mostly driven by error in camera pointing measurement. With additional training data to improve performance and detect additional types of features, a fleet of similar drones could autonomously collect actionable post-disaster data.

24 POWER TRANSMISSION AND DISTRIBUTION↗