The convergence time of the BDS PPP is much longer than the GPS PPP and it needs more than 60 min to achieve the accuracy better than 10 cm in both horizontal and vertical directions for dual-frequency PPP.
Similar with dual-frequency PPP, the positioning accuracy of the BDS single-frequency PPP in the fringe region is worse than other regions.
The aim of this study is to analyze the urban land use changes occurred in the central part of Ulaanbaatar, the capital city of Mongolia, from 1930 to 2008 with a 10-year interval using geographical information system (GIS) and very high-resolution remote sensing (RS) data sets.
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Urban landscapes are always in flux: new lanes, construction everywhere, altered traffic patterns.
With its frequent revisits, our satellite constellation often detects these street-scale changes before a city adds them to its official vector map, improving the experience for riders and drivers around the world.
The Root Mean Square (RMS) of BDS predicted orbits are better than 10 cm in radial and cross-track components, and the accuracy of the BDS real-time clock is better than 0.5 ns for Inclined Geosynchronous Orbit (IGSO) and Mid Earth Orbit (MEO) satellites.
The accuracy of BDS Geostationary Earth Orbit (GEO) orbits and clocks are worse than the IGSO and MEO satellites due to its poor geometry conditions.
A key factor in that planning: accurate terrain maps.To extract updated land use information from the RS images, Quickbird and Terra SAR images are fused.For the fusion, ordinary and special image fusion techniques are used and the results are compared.Uber has already revolutionized transportation by making it simple.Now Uber plans to make it even more accurate and trouble-free, using current, high-resolution satellite imagery from Digital Globe to identify the best pick-up and drop-off locations. OBJECTIVES OF THE BOARD • To eliminate ambiguity and uncertainty in Geographic Names in Samoa • To ensure there is appropriate recognition of Samoan heritage and culture in the selection of Geographic Names.