tailieunhanh - GeoSensor Networks - Chapter 9

Bộ sưu tập hiệu quả và trình bày dữ liệu của không gian địa lý là một trong những nhiệm vụ trọng tâm được giải quyết trong bối cảnh các dịch vụ dựa trên địa điểm. Ví dụ, các mô hình phong cảnh ảo đã được tạo ra và trình bày cho người sử dụng để thực hiện nhiệm vụ như điều hướng cá nhân trong môi trường đô thị phức tạp. | Generation and Application of Virtual Landscape Models for Location-Based services Norbert Haala and Martin Kada Institute for Photogrammetry ifp University of Stuttgart Germany Geschwister-Scholl-Strasse 24D D-70174 Stuttgart ABSTRACT The efficient collection and presentation of geospatial data is one key task to be solved in the context of location based services. As an example virtual landscape models have to be generated and presented to the user in order to realize tasks like personal navigation in complex urban environments. For an efficient model generation different data sources have to be integrated whereas an efficient application for location based services usually requires the use of multiple sensor configurations. The work on the generation and application of virtual landscape models described within the paper is motivated by a research project on the development of a generic platform that supports location aware applications with mobile users. 1. INTRODUCTION The ongoing rapid developments in the field of computer graphics meanwhile allow the use of standard hard- and software components even for challenging tasks like the real-time visualization of complex three-dimensional data. As a result components for the presentation of structured three-dimensional geodata are integrated in an increasing number of applications. If virtual threedimensional landscapes and building models - both indoor and outdoor - are visualized three-dimensionally the access to spatial information can for example be simplified within personal navigation systems. In order to realize these type of applications 3D landscape models have to be made available as a first step and tools allowing for the efficient presentation of this data have to be provided. Within the paper we present our work on the generation and application of virtual landscape models. These algorithms were developed as a part of the Nexus project which was started at the .