2.In spatial data processing,, we use the simple and scientific methods for the esta-blishment of DTM and the vector-raster conversion in order to handle large volumes ofdate.
4.Finally, a procedure is introduced on the basis of raster detection and vector calculation to detect sequential conflicts after displacement of buildings and a method for removing the sequential conflicts is described.
5.The integrated information units could be identified by a variety of methods according to different data types and issues including overlay-operation for Vector GIS, cell-partition for Raster GIS, and for some cases, synthetical consideration based on special treatment or expert-knowledge.
6.It gives a comparison between raster chart and vector chart, thus selecting the vector chart data which meets the Standard IHO S-57 (V3.0) to be the source of ECDB. In this chapter it is also to make a further introduction on the mathematics model, data structure and the procedure of making ENC.
