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In order to solve the ill-conditioned problem in GPS rapid positioning, an improved algorithm for ADPAM was proposed. By computing the optimal mirror plane, this algorithm achieved a maximized angle between the projected epoch subspace and its adjacent epoch. Thus, the optimization of ADPAM is implemented. For illustration, a measured GPS example is utilized to validate this algorithm and the results...
It causes lots of trouble for the managers in the department of urban management to manage the urban components because of the mobility of some urban components such as breakfast cart, stalls, and newsstands. To resolve this problem, the key issue is that how to get locations of these components rapidly and conveniently. Although, GPS is the popular positioning system used in the outdoors, urban buildings...
Moderate Resolution Imaging Spectroradiometer (MODIS) can monitor precipitable water vapor (PWV) with high accuracy and large scales over land and ocean, using both near-infrared (nIR) bands and traditional IR bands. The MODIS nIR PWV is only available during daytime, which can be retrieved at 1×1km spatial resolution with high accuracy, while the MODIS IR PWV can be obtained during both the day and...
Nowadays, researchers tend to make use of GPS trajectories collected by companies, organizations, or volunteers. GPS trajectories on crowdsourcing websites are less widely used in researches but actually have great potential for various applications. Thus, this paper makes a comprehensive study on GPS trajectories on VGI websites and social websites. The volume, growth rate, and categories of the...
With the development of Location-Based Services system (LBS), privacy protection of LBS is becoming a hotspot topic in GIS and mobile communication domains. Among series of LBS users' privacies protection techniques, Spatial-Temporal K-Anonymity has become a prominent method for its easy implementation and extension. While, this method and its variants suffer from a common drawback that they decrease...
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