ee.Terrain.aspect

Menghitung aspek dalam derajat dari DEM medan.

Gradien lokal dihitung menggunakan tetangga 4 arah dari setiap piksel, sehingga nilai yang hilang akan terjadi di sekitar tepi gambar.

Penggunaan	Hasil
ee.Terrain.aspect(input)	Gambar

Argumen	Jenis	Detail
input	Gambar	Gambar elevasi, dalam meter.

Contoh

Code Editor (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');;

Penyiapan Python

Lihat halaman Lingkungan Python untuk mengetahui informasi tentang Python API dan penggunaan geemap untuk pengembangan interaktif.

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