ee.Terrain.slope
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Calcule la pente en degrés à partir d'un MNT de terrain.
Le gradient local est calculé à l'aide des voisins 4-connexes de chaque pixel. Des valeurs manquantes se produiront donc autour des bords d'une image.
| Utilisation | Renvoie |
|---|
ee.Terrain.slope(input) | Image |
| Argument | Type | Détails |
|---|
input | Image | Image d'altitude, en mètres. |
Exemples
Éditeur de code (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');
Configuration de Python
Consultez la page
Environnement Python pour en savoir plus sur l'API Python et sur l'utilisation de geemap pour le développement interactif.
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
Sauf indication contraire, le contenu de cette page est régi par une licence Creative Commons Attribution 4.0, et les échantillons de code sont régis par une licence Apache 2.0. Pour en savoir plus, consultez les Règles du site Google Developers. Java est une marque déposée d'Oracle et/ou de ses sociétés affiliées.
Dernière mise à jour le 2025/07/26 (UTC).
[null,null,["Dernière mise à jour le 2025/07/26 (UTC)."],[[["\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```"]]
