Yongqi Chen

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Map-matching (MM) is a technique that attempts to locate an estimated vehicle position on road network. Many map-matching algorithms have been developed and widely incorporated into GPS/DR vehicle navigation systems for both commercial and experimental ITS applications. However, the reliability of these systems is still a problem because vehicle position(More)
—Lunar orbital imagery and laser altimeter data are two major data sources for lunar topographic modeling. Most of the previous work has processed imagery and laser altimeter data separately. Usually though, there are inconsistencies between the topographic models derived from them. This paper presents an endeavor to integrate the Chang'E-1 imagery and(More)
Land degradation is a major problem world-wide. Soil degradation is the core of land degradation. Soil degradation at regional scale is related to susceptibility to erosion, soil suitability, and soil characteristics. There is a pressing need for an objective measure on land degradation at regional scale. The study area is in Hengshan county in ShanXi(More)
Spaceborne Interferometric Synthetic Aperture Radar (InSAR) has been demonstrated to be a potential tool for generating digital elevation models (DEM). The co-registration of SAR complex images is one of the most important processing procedures involved in InSAR. The quality of the co-registration significantly influences the final quality of any SAR(More)
Lunar orbital imagery and laser altimeter data are two major data sources for lunar topographic modeling. Most of the previous work has processed imagery and laser altimeter data separately. Usually though there are inconsistencies between the topographic models derived from them. This talk presents an endeavor to integrate the Chang'E-1 imagery and laser(More)
The Lands Department of Hong Kong is establishing a permanent GPS array of reference stations for various applications. It collects GPS data continuously from multiple reference stations and delivers quality-checked data to users. This well-positioned and dense array of reference stations is designed to allow users to achieve cm-level accuracy within a(More)