Modeling visibility through visual landmarks in 3D navigation using geo-DBMS

Today’s map navigation systems (from 2D to 3D) provide direction instructions in the form of maps, pictograms, and spoken language. However, they are so far not able to support or has very limited access to landmark-based navigation, which the most natural navigation concept is for humans and which also plays an important role for upcoming personal navigation systems. In order to provide such navigation, in this paper, we discuss one of possible solution of modeling visibility in 3D navigation through visual landmarks using Geo-DBMS approach. The aim is to generate measurable visual landmarks along the focus map in a city model which can be used in car or pedestrian navigation system (as web or mobile application). The focus map is obtained from 3D analytical operation (3D buffering from the 3D shortest path analysis result) function within Geo-DBMS. Detailing to the generated measurable visual landmark’s façade, an implementation of dynamic pulse function is then applied. The techniques for choosing specific landmarks and generating the focus maps are shortly presented and their functionality is explained. We tested the proposed approach by using Stuttgart 3D city model. Finally, the paper provides outlook on ideas for future deployment and research

3D navigation system based on synthetic texturing

Navigation system is the order of the day to pilot people to their destination. This paper focuses on the uses of mobile devices such as PDA’s and smart phones without additional hardware to direct pedestrians based on synthetic texturing along with 3D modeling. Each façade is reconstructed by means of arraying small sized textures in respect to their geometries in different layers. In the process of texture generation cropping, rectifying, removing disturbing objects and exposure setting should be done in advance. Unlimited number of layers with different priorities and their horizontal and vertical pulse functions and texture files can be utilize d for creating a simple and square looking façade. Each 3D model is created by mapping the synthetic textures on the 3D geometries of each building’s 3D model

3D navigation systems based on synthetic texturing

Navigation system is the order of the day to pilot people to their destination. This paper focuses on the uses of mobile devices such as PDA’s and smart phones without additional hardware to direct pedestrians based on synthetic texturing along with 3D modeling. Each facade is reconstructed by arraying small sized textures in respect to their geometries in different layers. In the process of texture generation cropping, rectifying, removing disturbing objects and exposure setting should be done in advance. Unlimited number of layers with different priorities and their horizontal and vertical pulse functions and texture files can be utilized for creating a simple square looking facade. Each 3D model is created by mapping the synthetic textures on the 3D geometries of each building’s 3D model. The processes to create the synthetic textures as well as their usage in mobiles’ context are described in detail in this paper