篩選 ImageCollection

如開始使用和圖片集資訊所示，Earth Engine 提供多種方便的方法，可用於篩選圖片集。具體來說，許多常見用途都由 imageCollection.filterDate() 和 imageCollection.filterBounds() 處理。如要進行一般用途篩選，請使用 imageCollection.filter()，並將 ee.Filter 做為引數。以下範例示範便利方法和 filter()，用於從 ImageCollection 中找出並移除雲量覆蓋率高的圖片。

程式碼編輯器 (JavaScript)

// Load Landsat 8 data, filter by date, month, and bounds.
var collection = ee.ImageCollection('LANDSAT/LC08/C02/T1_TOA')
  .filterDate('2015-01-01', '2018-01-01')  // Three years of data
  .filter(ee.Filter.calendarRange(11, 2, 'month'))  // Only Nov-Feb observations
  .filterBounds(ee.Geometry.Point(25.8544, -18.08874));  // Intersecting ROI

// Also filter the collection by the CLOUD_COVER property.
var filtered = collection.filter(ee.Filter.eq('CLOUD_COVER', 0));

// Create two composites to check the effect of filtering by CLOUD_COVER.
var badComposite = collection.mean();
var goodComposite = filtered.mean();

// Display the composites.
Map.setCenter(25.8544, -18.08874, 13);
Map.addLayer(badComposite,
             {bands: ['B3', 'B2', 'B1'], min: 0.05, max: 0.35, gamma: 1.1},
             'Bad composite');
Map.addLayer(goodComposite,
             {bands: ['B3', 'B2', 'B1'], min: 0.05, max: 0.35, gamma: 1.1},
             'Good composite');

Python 設定

請參閱「 Python 環境」頁面，瞭解 Python API 和如何使用 geemap 進行互動式開發。

import ee
import geemap.core as geemap

Colab (Python)

# Load Landsat 8 data, filter by date, month, and bounds.
collection = (
    ee.ImageCollection('LANDSAT/LC08/C02/T1_TOA')
    # Three years of data
    .filterDate('2015-01-01', '2018-01-01')
    # Only Nov-Feb observations
    .filter(ee.Filter.calendarRange(11, 2, 'month'))
    # Intersecting ROI
    .filterBounds(ee.Geometry.Point(25.8544, -18.08874))
)

# Also filter the collection by the CLOUD_COVER property.
filtered = collection.filter(ee.Filter.eq('CLOUD_COVER', 0))

# Create two composites to check the effect of filtering by CLOUD_COVER.
bad_composite = collection.mean()
good_composite = filtered.mean()

# Display the composites.
m = geemap.Map()
m.set_center(25.8544, -18.08874, 13)
m.add_layer(
    bad_composite,
    {'bands': ['B3', 'B2', 'B1'], 'min': 0.05, 'max': 0.35, 'gamma': 1.1},
    'Bad composite',
)
m.add_layer(
    good_composite,
    {'bands': ['B3', 'B2', 'B1'], 'min': 0.05, 'max': 0.35, 'gamma': 1.1},
    'Good composite',
)
m