粤港澳大湾区地形图

三维地形图以晕渲底图叠加等高线和等深线的形式表达。其中晕渲底图用Surfer软件编制，选择合适的纵向比例和光照角，以凸显地形的起伏；叠加不同的配色显示不同的高程和水深。等高线和等深线的设置根据海陆和地势陡缓分别设置。陆区仅显示200m等高线；海区水深浅于20m的海域显示2m、5m和10m等深线；水深大于20m小于200m的海域等深线间距为20m；水深大于200m小于500m的海域等深线间距为100m；水深大于600m的海域等深线间距为200m。

Three-dimensional topographic maps are created by overlaying shaded relief base maps with contour lines and bathymetric lines. The shaded relief base maps are generated using Surfer software, with appropriate vertical scaling and illumination angles selected to highlight topographic relief. Distinct color schemes are overlaid to represent varying elevations and water depths. The settings for contour lines and bathymetric lines are adjusted separately based on whether the area is terrestrial or marine, as well as the terrain steepness. Only the 200-meter contour line is displayed on terrestrial regions. For marine areas with water depth shallower than 20 meters, the 2m, 5m and 10m bathymetric lines are shown. For marine regions with water depth greater than 20 m but less than 200 m, the interval between consecutive bathymetric lines is set to 20 m. For marine areas with water depth greater than 200 m but less than 500 m, the interval between consecutive bathymetric lines is set to 100 m. For marine areas with water depth exceeding 600 m, the interval between consecutive bathymetric lines is set to 200 m.