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The signals that are available for navigation depend on the environment. To operate reliably in a wide range of different… Expand In dense urban areas, conventional Global Navigation Satellite Systems (GNSS) positioning can exhibit errors of tens of metres… Expand The wide field of view (WFV) imaging system onboard the Chinese GF-1 optical satellite has a 16-m resolution and four-day revisit… Expand We developed a new two-step approach for automated masking of clouds and their shadows in Landsat imagery. The first step… Expand GNSS shadow matching is a new technique that uses 3D mapping to improve positioning accuracy in dense urban areas from tens of… Expand GNSS positioning performance in dense urban areas is severely degraded due to the obstruction and reflection of the signals by… Expand Global navigation satellite system (GNSS) positioning is widely used in land vehicle and pedestrian navigation systems… Expand Visual odometry involves the computation of 3-D motion and (or) trajectory by tracking features in the video or image sequences… Expand The Global Positioning System (GPS) is unreliable in dense urban areas, known as urban canyons, which have tall buildings or… Expand This work presents a new algorithm designed to detect clouds in satellite visible and infrared (IR) imagery of ice sheets. The… Expand