Research on automatically constructing DEM based on city vector map;

Model and algorithm for sensor placement based on vector map data in distributed sensor networks;

Study on progressive transmission of vector map data;

Photonic RF phase shifters based on OTTD(optical true time delay),heterodyne mixing technique and vector sum technique were introduced.

In this paper,the Optical True Time Delay(OTTD)shifter,optical heterodyne SSB radio frequency(RF)shifter and the photonic RF phase shifter based on vector sum technique are presented and their operation principle and technical features are analyzed respectively.

The basic principle of vectorization technology and its application in high performance scientific calculation are introduced in this paper.

In this article,the authors have thoroughly analyzed the structure of vector topographic map in Microstation in order to research the technique to manage the vector data and raster data in SQL2000 SERVER.

This paper analyzes the shortage of Microstation’s GIS framework and the structure of vector topographic map in it, and uses VBA to build a middleware which is able to distill, store, query and output the vector data.

This paper introduces the process of the foundation geographical information system data of Nanjing to store in database simply, and describes company’s project of using construction surveying data to update the vector topographic map detailedly.