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ee.Terrain.slope
使用集合让一切井井有条
根据您的偏好保存内容并对其进行分类。
根据地形 DEM 计算坡度(以度为单位)。
局部梯度是使用每个像素的 4 个相邻像素计算的,因此图像边缘附近会出现缺失值。
用法 | 返回 |
---|
ee.Terrain.slope(input) | 图片 |
参数 | 类型 | 详细信息 |
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input | 图片 | 高程图片,以米为单位。 |
示例
代码编辑器 (JavaScript)
// A digital elevation model.
var dem = ee.Image('NASA/NASADEM_HGT/001').select('elevation');
// Calculate slope. Units are degrees, range is [0,90).
var slope = ee.Terrain.slope(dem);
// Calculate aspect. Units are degrees where 0=N, 90=E, 180=S, 270=W.
var aspect = ee.Terrain.aspect(dem);
// Display slope and aspect layers on the map.
Map.setCenter(-123.457, 47.815, 11);
Map.addLayer(slope, {min: 0, max: 89.99}, 'Slope');
Map.addLayer(aspect, {min: 0, max: 359.99}, 'Aspect');
// Use the ee.Terrain.products function to calculate slope, aspect, and
// hillshade simultaneously. The output bands are appended to the input image.
// Hillshade is calculated based on illumination azimuth=270, elevation=45.
var terrain = ee.Terrain.products(dem);
print('ee.Terrain.products bands', terrain.bandNames());
Map.addLayer(terrain.select('hillshade'), {min: 0, max: 255}, 'Hillshade');
Python 设置
如需了解 Python API 和如何使用 geemap
进行交互式开发,请参阅
Python 环境页面。
import ee
import geemap.core as geemap
Colab (Python)
# A digital elevation model.
dem = ee.Image('NASA/NASADEM_HGT/001').select('elevation')
# Calculate slope. Units are degrees, range is [0,90).
slope = ee.Terrain.slope(dem)
# Calculate aspect. Units are degrees where 0=N, 90=E, 180=S, 270=W.
aspect = ee.Terrain.aspect(dem)
# Display slope and aspect layers on the map.
m = geemap.Map()
m.set_center(-123.457, 47.815, 11)
m.add_layer(slope, {'min': 0, 'max': 89.99}, 'Slope')
m.add_layer(aspect, {'min': 0, 'max': 359.99}, 'Aspect')
# Use the ee.Terrain.products function to calculate slope, aspect, and
# hillshade simultaneously. The output bands are appended to the input image.
# Hillshade is calculated based on illumination azimuth=270, elevation=45.
terrain = ee.Terrain.products(dem)
display('ee.Terrain.products bands', terrain.bandNames())
m.add_layer(terrain.select('hillshade'), {'min': 0, 'max': 255}, 'Hillshade')
m
如未另行说明,那么本页面中的内容已根据知识共享署名 4.0 许可获得了许可,并且代码示例已根据 Apache 2.0 许可获得了许可。有关详情,请参阅 Google 开发者网站政策。Java 是 Oracle 和/或其关联公司的注册商标。
最后更新时间 (UTC):2025-07-26。
[null,null,["最后更新时间 (UTC):2025-07-26。"],[[["\u003cp\u003eCalculates the slope of a terrain in degrees using a Digital Elevation Model (DEM).\u003c/p\u003e\n"],["\u003cp\u003eUses the 4-connected neighbors of each pixel for computation, leading to missing values at image edges.\u003c/p\u003e\n"],["\u003cp\u003eOutputs a slope image with values ranging from 0 to 90 degrees, representing the steepness of the terrain.\u003c/p\u003e\n"],["\u003cp\u003eProvides examples in JavaScript and Python demonstrating slope calculation and visualization.\u003c/p\u003e\n"]]],[],null,["# ee.Terrain.slope\n\nCalculates slope in degrees from a terrain DEM.\n\n\u003cbr /\u003e\n\nThe local gradient is computed using the 4-connected neighbors of each pixel, so missing values will occur around the edges of an image.\n\n| Usage | Returns |\n|---------------------------|---------|\n| `ee.Terrain.slope(input)` | Image |\n\n| Argument | Type | Details |\n|----------|-------|--------------------------------|\n| `input` | Image | An elevation image, in meters. |\n\nExamples\n--------\n\n### Code Editor (JavaScript)\n\n```javascript\n// A digital elevation model.\nvar dem = ee.Image('NASA/NASADEM_HGT/001').select('elevation');\n\n// Calculate slope. Units are degrees, range is [0,90).\nvar slope = ee.Terrain.slope(dem);\n\n// Calculate aspect. Units are degrees where 0=N, 90=E, 180=S, 270=W.\nvar aspect = ee.Terrain.aspect(dem);\n\n// Display slope and aspect layers on the map.\nMap.setCenter(-123.457, 47.815, 11);\nMap.addLayer(slope, {min: 0, max: 89.99}, 'Slope');\nMap.addLayer(aspect, {min: 0, max: 359.99}, 'Aspect');\n\n// Use the ee.Terrain.products function to calculate slope, aspect, and\n// hillshade simultaneously. The output bands are appended to the input image.\n// Hillshade is calculated based on illumination azimuth=270, elevation=45.\nvar terrain = ee.Terrain.products(dem);\nprint('ee.Terrain.products bands', terrain.bandNames());\nMap.addLayer(terrain.select('hillshade'), {min: 0, max: 255}, 'Hillshade');\n```\nPython setup\n\nSee the [Python Environment](/earth-engine/guides/python_install) page for information on the Python API and using\n`geemap` for interactive development. \n\n```python\nimport ee\nimport geemap.core as geemap\n```\n\n### Colab (Python)\n\n```python\n# A digital elevation model.\ndem = ee.Image('NASA/NASADEM_HGT/001').select('elevation')\n\n# Calculate slope. Units are degrees, range is [0,90).\nslope = ee.Terrain.slope(dem)\n\n# Calculate aspect. Units are degrees where 0=N, 90=E, 180=S, 270=W.\naspect = ee.Terrain.aspect(dem)\n\n# Display slope and aspect layers on the map.\nm = geemap.Map()\nm.set_center(-123.457, 47.815, 11)\nm.add_layer(slope, {'min': 0, 'max': 89.99}, 'Slope')\nm.add_layer(aspect, {'min': 0, 'max': 359.99}, 'Aspect')\n\n# Use the ee.Terrain.products function to calculate slope, aspect, and\n# hillshade simultaneously. The output bands are appended to the input image.\n# Hillshade is calculated based on illumination azimuth=270, elevation=45.\nterrain = ee.Terrain.products(dem)\ndisplay('ee.Terrain.products bands', terrain.bandNames())\nm.add_layer(terrain.select('hillshade'), {'min': 0, 'max': 255}, 'Hillshade')\nm\n```"]]