ee.Terrain.aspect
קל לארגן דפים בעזרת אוספים
אפשר לשמור ולסווג תוכן על סמך ההעדפות שלך.
Calculates aspect in degrees from a terrain DEM.
השיפוע המקומי מחושב באמצעות 4 השכנים שמחוברים לכל פיקסל, ולכן ערכים חסרים יופיעו סביב הקצוות של התמונה.
| שימוש | החזרות |
|---|
ee.Terrain.aspect(input) | תמונה |
| ארגומנט | סוג | פרטים |
|---|
input | תמונה | תמונה של גובה פני השטח, במטרים. |
דוגמאות
עורך הקוד (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');;
הגדרת Python
מידע על Python API ועל שימוש ב-geemap לפיתוח אינטראקטיבי מופיע בדף
Python Environment.
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
אלא אם צוין אחרת, התוכן של דף זה הוא ברישיון Creative Commons Attribution 4.0 ודוגמאות הקוד הן ברישיון Apache 2.0. לפרטים, ניתן לעיין במדיניות האתר Google Developers. Java הוא סימן מסחרי רשום של חברת Oracle ו/או של השותפים העצמאיים שלה.
עדכון אחרון: 2025-07-26 (שעון UTC).
[null,null,["עדכון אחרון: 2025-07-26 (שעון UTC)."],[[["\u003cp\u003eCalculates the direction a terrain faces (aspect) in degrees, ranging from 0 to 360.\u003c/p\u003e\n"],["\u003cp\u003eUses a digital elevation model (DEM) as input to determine aspect.\u003c/p\u003e\n"],["\u003cp\u003eEmploys a 4-connected neighborhood method, leading to potential missing values around image edges.\u003c/p\u003e\n"],["\u003cp\u003eOutputs an image where pixel values represent aspect in degrees (0=North, 90=East, 180=South, 270=West).\u003c/p\u003e\n"]]],[],null,["# ee.Terrain.aspect\n\nCalculates aspect 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.aspect(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```"]]
