3.3 本章小结 ............................................................................................................29
第 4 章 基于 GNET8.1 平台设计.............................................................................30
4.1 GNET8.1 平台概述.............................................................................................30
4.2 第三方库的使用 ................................................................................................31
4.3 GIS 组件分解......................................................................................................32
4.3.1 BasicMath 组件...........................................................................................32
4.3.2 FileLoader 组件............................................................................................33
4.3.3 Geometry 组件 .............................................................................................34
4.3.4 DataSrc_Spatial 组件 ...................................................................................34
4.3.5 Projection 组件............................................................................................36
4.3.6 RGImage 组件..............................................................................................38
4.3.7 DMapObject 组件 ........................................................................................39
4.4 人员分配 ............................................................................................................40
4.5 本章小结 ............................................................................................................41
第 5 章 项目功能实现 ..............................................................................................42
5.1 栅格数据解析 ....................................................................................................42
5.2 地图坐标转换 ....................................................................................................44
5.2.1 对于使用 WGS84 坐标的地图 ..................................................................44
5.2.2 对于使用 UTM 的投影的地图 ..................................................................46
5.2.3 对于使用非 UTM 的投影的地图 ..............................................................48
5.3 地形纹理背景图生成 ........................................................................................48
5.4 地图 Dem 数据检索 ..........................................................................................50
5.4.1 边界的处理： .............................................................................................51
5.4.2 插值中有无效点 .........................................................................................51
5.4.3 链路线上取点 .............................................................................................51
5.5 矢量数据解析 ....................................................................................................52
5.5.1 地图属性 .....................................................................................................52
5.5.2 存取模式 .....................................................................................................52
5.5.3 数据处理 .....................................................................................................54
5.6 本章小结 ............................................................................................................56
第 6 章 项目性能优化 ..............................................................................................57
6.1 使用 TIFF 存储..................................................................................................57
6.2 栅格金字塔 ........................................................................................................57
6.3 数据缓冲区 ........................................................................................................58
6.4 预制颜色表 ........................................................................................................59
6.5 本章小结 ............................................................................................................59
第 7 章 项目测试 ......................................................................................................60
7.1 总体质量评价 ....................................................................................................60
7.2 各维度质量评价 ................................................................................................62
7.2.1 特性功能评价 .............................................................................................62
