基于联级阴影的空间数据融合、对象拾取方法

A method of spatial data fusion and object picking based on cascaded shadow maps

当前三维GIS中,地形、实景三维、矢量构成三维景观的重要空间数据,矢量要素在地形分类与空间分析中有着重要应用,如何使矢量适应地表与空间数据融合是三维GIS的一项重要技术。本文基于联级阴影贴图渲染到纹理技术实现矢量数据与空间数据融合,空间数据融合包含纹理贴图及利用矢量数据实现对空间数据进行实时编辑修改,同时基于该技术实现矢量要素的实时拾取。

In current 3D GIS,terrain,oblique photography model,and vectors are important spatial data of 3D landscape.Vector data is widely used in terrain classification and spatial analysis.How to adapt vectors to the terrain surface and realize spatial data fusion is an important technology in 3D GIS.This paper is based on cascaded shadow maps and rendering to texture technology to achieve spatial data fusion.Here spatial data fusion includes texture mapping,real-time editing and modifying spatial data,the real-time picking up of vectors.