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用Python一键生成3D地形图:让你的数据“站”起来

  • 2026-02-26 00:56:30
用Python一键生成3D地形图:让你的数据“站”起来

只需几行代码,在浏览器中探索真实世界的高程数据


你是否想过,用Python轻松创建一个可交互的3D地形图?今天,我将带你用pydeck库实现这个目标——只需十几行代码,就能生成一个基于真实地理数据的立体高程地图,让你像上帝视角一样俯瞰山川起伏。


什么是PyDeck?

PyDeck是Uber开源的一个Python库,用于在Jupyter Notebook或网页中创建高性能的3D可视化。它基于deck.gl(一个WebGL驱动的可视化框架),让你能够:

  • 轻松加载地理空间数据
  • 创建多种图层(散点图、弧线图、热力图、3D地形等)
  • 生成可交互的3D场景,支持旋转、缩放、倾斜

简单来说,PyDeck让地理数据可视化变得像写Python一样简单


代码逐行解析

import pydeck as pdk

导入pydeck库,约定俗成地简写为pdk

terrain = pdk.Layer(
"TerrainLayer",
    elevation_data="https://s3.amazonaws.com/elevation-tiles-prod/terrarium/{z}/{x}/{y}.png",
    texture="https://a.tile.openstreetmap.org/{z}/{x}/{y}.png",
    elevation_decoder={"rscaler"256"gscaler"1"bscaler"1/256},
    elevation_scale=30
)

这里创建了一个地形图层,是3D地图的核心:

  • "TerrainLayer":指定图层类型为地形图层
  • elevation_data:高程数据源,这里使用标准的Terrarium格式切片服务。{z}/{x}/{y}是瓦片坐标的占位符,pydeck会自动根据当前视图加载对应的瓦片
  • **texture**:地表纹理,这里使用OpenStreetMap的卫星影像,让地形看起来更真实
  • elevation_decoder:高程解码器。Terrarium格式将高程编码在RGB像素中,这个字典告诉pydeck如何从RGB值还原出实际高度:
    • 红色通道值 × 256
    • 绿色通道值 × 1
    • 蓝色通道值 × 1/256
    • 三者相加得到实际高程(单位:米)
  • elevation_scale=30:高程缩放系数,将高度乘以30倍,让地形起伏更明显
pdk.Deck(
    layers=[terrain],
    initial_view_state=pdk.ViewState(
        latitude=37.76,
        longitude=-122.42
        zoom=11
        pitch=45
    )
)

最后,创建一个Deck对象来渲染整个场景:

  • layers:包含我们刚刚创建的地形图层
  • initial_view_state:初始视图状态,定义了镜头位置:
    • latitude/longitude:镜头对准的经纬度(这里是旧金山附近)
    • zoom=11:缩放级别,数字越大越近
    • pitch=45:倾斜角度,45度让你既能看到平面也能看到高度

运行效果

当你在Jupyter Notebook中运行这段代码,会发生什么?

  1. 一个交互式的3D地图会在输出区域加载
  2. 你会看到旧金山地区的立体地形,山峦起伏清晰可见
  3. 可以用鼠标:
    • 拖拽平移视角
    • 滚轮缩放
    • 右键拖拽旋转倾斜角度
  4. 随着你移动,新的地形瓦片会自动加载,无缝探索整个区域

进阶玩法:自定义你的3D地形

1. 改变地理位置

想看看其他地方?只需修改ViewState中的经纬度:

# 日本富士山
initial_view_state=pdk.ViewState(latitude=35.36, longitude=138.73, zoom=10, pitch=45)

# 瑞士阿尔卑斯山
initial_view_state=pdk.ViewState(latitude=46.56, longitude=8.38, zoom=9, pitch=45)

2. 调整地形夸张程度

修改elevation_scale参数:

terrain = pdk.Layer(
"TerrainLayer",
# ... 其他参数不变
    elevation_scale=50# 更大的缩放,让山更高
)

3. 更换纹理源

可以换成其他风格的底图:

# 使用卫星影像
texture="https://server.arcgisonline.com/ArcGIS/rest/services/World_Imagery/MapServer/tile/{z}/{y}/{x}"

# 使用淡色底图(更适合突出高程)
texture="https://cartodb-basemaps-a.global.ssl.fastly.net/light_all/{z}/{x}/{y}.png"

4. 叠加其他数据

你可以创建多个图层,叠加显示:

# 添加一个散点图层(比如城市位置)
cities = pdk.Layer(
"ScatterplotLayer",
    data=[{"lat"37.76"lon"-122.42"name""San Francisco"}],
    get_position='[lon, lat]',
    get_radius=1000,
    get_fill_color=[25500160]
)

pdk.Deck(
    layers=[terrain, cities],  # 叠加两个图层
    initial_view_state=...
)

环境配置小贴士

如果你还没安装pydeck:

pip install pydeck

在Jupyter Notebook中使用时,可能需要启用扩展:

jupyter nbextension install --sys-prefix --symlink --overwrite --py pydeck
jupyter nbextension enable --sys-prefix --py pydeck

如果只是想快速预览,也可以将代码保存为.py文件运行,会生成一个HTML文件并在浏览器中打开。


实际应用场景

这个简单的3D地形可视化,其实有很多实际用途:

  • 地理教学:直观展示地形对气候、人口分布的影响
  • 城市规划:在真实地形上叠加建筑、道路规划
  • 户外运动:徒步路线规划,提前了解地形起伏
  • 游戏开发:快速生成真实世界的地形作为游戏场景
  • 地质研究:可视化断层、火山等地貌特征

结语

从这段不到15行的代码开始,你已经掌握了用Python创建3D地形可视化的能力。无论是探索地球的壮丽山河,还是为你的数据项目增添地理维度,pydeck都是一个强大而易用的工具。

代码虽短,视野无限。下次我们将在这个基础上,叠加更多地理数据,让可视化真正讲出故事。

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  1. CONNECT:[ UseTime:0.000671s ] mysql:host=127.0.0.1;port=3306;dbname=f_mffb;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000899s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000310s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000284s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000488s ]
  6. SELECT * FROM `set` [ RunTime:0.000194s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000536s ]
  8. SELECT * FROM `article` WHERE `id` = 476713 LIMIT 1 [ RunTime:0.007627s ]
  9. UPDATE `article` SET `lasttime` = 1772240601 WHERE `id` = 476713 [ RunTime:0.006982s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 66 LIMIT 1 [ RunTime:0.000235s ]
  11. SELECT * FROM `article` WHERE `id` < 476713 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000822s ]
  12. SELECT * FROM `article` WHERE `id` > 476713 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.000525s ]
  13. SELECT * FROM `article` WHERE `id` < 476713 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.001942s ]
  14. SELECT * FROM `article` WHERE `id` < 476713 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.002866s ]
  15. SELECT * FROM `article` WHERE `id` < 476713 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.000937s ]
0.093102s