衡山 · 三维地形重建

衡山 · 三维地形与常见问题

衡山是中国五岳中的南岳，位于湖南省衡阳市，主峰祝融峰海拔 1300.2 m，是五岳中最南的一座。衡山旧称「寿岳」，以景色秀丽著称。

怎么看这张三维地形

高程数据从哪来

本页三维地形是真实的：高程数据来自 NASA SRTM 1-arc-second（约 30 m）数字高程模型（DEM），裁剪并重采样到约 120 m 网格用于流畅渲染。为便于观察地形起伏，垂直方向做了约 ×1.8 的夸张——这是为了看清而放大，并非真实坡度。

什么是等高线

等高线是把海拔相同的点连成的曲线：同一条线上海拔处处相同，线越密表示坡度越陡、越稀表示越平缓。本页的等高线由 marching squares 算法从高程场中提取为矢量线；点「▤ 只看等高线」可切换到二维等高线图，不看三维山体、只看线。

五岳配「五行五色」主题：东青、南赤、西白（金）、北玄（黑）、中黄，与传统五方五色对应。

常见问题

Mount Heng (South) · 3D Terrain & FAQ

Mount Heng (South) is the South Great Mountain, in Hengyang, Hunan, with its main summit Zhurong Peak at 1300.2 m — the southernmost of the Five. Formerly called the “Mountain of Longevity,” it is known for its scenic beauty.

How to read this 3D terrain

Where the elevation comes from

The 3D terrain on this page is real: elevation comes from NASA SRTM 1-arc-second (~30 m) DEM data, cropped and resampled to a ~120 m grid for smooth rendering. The vertical axis is exaggerated by about ×1.8 to make the relief easier to read — it is enlarged for clarity, not the true slope.

What contour lines are

A contour line connects points of equal elevation: every point on one line is at the same height, and lines packed closely mean a steeper slope while widely spaced lines mean gentler ground. Here the contours are extracted as vector lines from the elevation field by the marching-squares algorithm; tap “▤ Contours” to switch to a flat 2D contour map and see the lines alone.

The Five Great Mountains use a “five phases, five colors” theme: East cyan, South red, West white (metal), North black, Center yellow — matching the traditional five directions and colors.

FAQ