Export.image.toCloudStorage

建立批次工作,將圖片匯出為點陣圖至 Google Cloud Storage。你可以從「工作」分頁啟動工作。

「crsTransform」、「scale」和「dimensions」互斥。

用量傳回
Export.image.toCloudStorage(image, description, bucket, fileNamePrefix, dimensions, region, scale, crs, crsTransform, maxPixels, shardSize, fileDimensions, skipEmptyTiles, fileFormat, formatOptions, priority)
引數類型詳細資料
image圖片要匯出的圖片。
description字串 (選用)使用者可解讀的工作名稱。預設為「myExportImageTask」。
bucket字串 (選用)Cloud Storage 目標 bucket。
fileNamePrefix字串 (選用)用做輸出內容前置字元的字串。尾端的「/」表示路徑。預設為工作說明。
dimensionsNumber|String,選用匯出圖片時使用的尺寸。可接受單一正整數做為最大尺寸,或「WIDTHxHEIGHT」,其中 WIDTH 和 HEIGHT 各為正整數。
regionGeometry.LinearRing|Geometry.Polygon|String,選用要匯出的區域,以 LinearRing、Polygon 或座標表示。這些可指定為 Geometry 物件或序列化為字串的座標。
scale號碼 (選填)每像素的解析度 (以公尺為單位)。預設值為 1000。
crs字串 (選用)用於匯出圖片的 CRS。
crsTransformList[Number]|String,選填用於匯出圖片的仿射轉換。需要定義「crs」。
maxPixels號碼 (選填)限制匯出像素數量。根據預設,如果匯出作業超過 1 億像素,系統會顯示錯誤訊息。明確設定這個值可提高或降低這個限制。
shardSize號碼 (選填)計算這張圖片時,圖塊的大小 (以像素為單位)。預設為 256。
fileDimensionsList[Number]|Number,選填每個圖片檔案的像素尺寸 (如果圖片太大,無法放入單一檔案)。您可以指定單一數字來表示正方形,或指定兩個尺寸的陣列來表示 (寬度、高度)。請注意,圖片仍會裁剪為整體圖片尺寸。必須是 shardSize 的倍數。
skipEmptyTiles布林值 (選填)如果為 true,則略過寫入空白 (即完全遮蓋) 的圖片圖塊。預設為 false。僅支援 GeoTIFF 匯出。
fileFormat字串 (選用)圖片匯出的字串檔案格式。目前僅支援「GeoTIFF」和「TFRecord」,預設為「GeoTIFF」。
formatOptionsImageExportFormatConfig (選用)字串鍵的字典,用於格式專屬選項。如果是「GeoTIFF」:包括「cloudOptimized」(布林值)、「noData」(浮點數)。如果是「TFRecord」,請參閱 https://developers.google.com/earth-engine/guides/tfrecord#formatoptions
priority號碼 (選填)專案內工作的優先順序。系統會優先排定優先順序較高的工作。必須是介於 0 至 9999 之間的整數。預設值為 100。

範例

程式碼編輯器 (JavaScript)

// A Landsat 8 surface reflectance image.
var image = ee.Image('LANDSAT/LC08/C02/T1_L2/LC08_044034_20210508')
  .select(['SR_B.']);  // reflectance bands

// A region of interest.
var region = ee.Geometry.BBox(-122.24, 37.13, -122.11, 37.20);

// Set the export "scale" and "crs" parameters.
Export.image.toCloudStorage({
  image: image,
  description: 'image_export',
  bucket: 'gcs-bucket-name',
  fileNamePrefix: 'image_export',
  region: region,
  scale: 30,
  crs: 'EPSG:5070'
});

// Use the "crsTransform" export parameter instead of "scale" for more control
// over the output grid. Here, "crsTransform" is set to align the output grid
// with the grid of another dataset. To view an image's CRS transform:
// print(image.projection())
Export.image.toCloudStorage({
  image: image,
  description: 'image_export_crstransform',
  bucket: 'gcs-bucket-name',
  fileNamePrefix: 'image_export_crstransform',
  region: region,
  crsTransform: [30, 0, -2493045, 0, -30, 3310005],
  crs: 'EPSG:5070'
});

// If the export has more than 1e8 pixels, set "maxPixels" higher.
Export.image.toCloudStorage({
  image: image,
  description: 'image_export_maxpixels',
  bucket: 'gcs-bucket-name',
  fileNamePrefix: 'image_export_maxpixels',
  region: region,
  scale: 30,
  crs: 'EPSG:5070',
  maxPixels: 1e13
});

// Export a Cloud Optimized GeoTIFF (COG) by setting the "cloudOptimized"
// parameter to true.
Export.image.toCloudStorage({
  image: image,
  description: 'image_export_cog',
  bucket: 'gcs-bucket-name',
  fileNamePrefix: 'image_export_cog',
  region: region,
  scale: 30,
  crs: 'EPSG:5070',
  formatOptions: {
    cloudOptimized: true
  }
});

// Define a nodata value and replace masked pixels with it using "unmask".
// Set the "sameFootprint" parameter as "false" to include pixels outside of the
// image geometry in the unmasking operation.
var noDataVal = -9999;
var unmaskedImage = image.unmask({value: noDataVal, sameFootprint: false});
// Use the "noData" key in the "formatOptions" parameter to set the nodata value
// (GeoTIFF format only).
Export.image.toCloudStorage({
  image: unmaskedImage,
  description: 'image_export_nodata',
  bucket: 'gcs-bucket-name',
  fileNamePrefix: 'image_export_nodata',
  region: image.geometry(),  // full image bounds
  scale: 2000,  // large scale for minimal demo
  crs: 'EPSG:5070',
  fileFormat: 'GeoTIFF',
  formatOptions: {
    noData: noDataVal
  }
});

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)

# A Landsat 8 surface reflectance image.
image = ee.Image(
    'LANDSAT/LC08/C02/T1_L2/LC08_044034_20210508'
).select(['SR_B.'])  # reflectance bands

# A region of interest.
region = ee.Geometry.BBox(-122.24, 37.13, -122.11, 37.20)

# Set the export "scale" and "crs" parameters.
task = ee.batch.Export.image.toCloudStorage(
    image=image,
    description='image_export',
    bucket='gcs-bucket-name',
    fileNamePrefix='image_export',
    region=region,
    scale=30,
    crs='EPSG:5070'
)
task.start()

# Use the "crsTransform" export parameter instead of "scale" for more control
# over the output grid. Here, "crsTransform" is set to align the output grid
# with the grid of another dataset. To view an image's CRS transform:
# display(image.projection())
task = ee.batch.Export.image.toCloudStorage(
    image=image,
    description='image_export_crstransform',
    bucket='gcs-bucket-name',
    fileNamePrefix='image_export_crstransform',
    region=region,
    crsTransform=[30, 0, -2493045, 0, -30, 3310005],
    crs='EPSG:5070'
)
task.start()

# If the export has more than 1e8 pixels, set "maxPixels" higher.
task = ee.batch.Export.image.toCloudStorage(
    image=image,
    description='image_export_maxpixels',
    bucket='gcs-bucket-name',
    fileNamePrefix='image_export_maxpixels',
    region=region,
    scale=30,
    crs='EPSG:5070',
    maxPixels=1e13
)
task.start()

# Export a Cloud Optimized GeoTIFF (COG) by setting the "cloudOptimized"
# parameter to true.
task = ee.batch.Export.image.toCloudStorage(
    image=image,
    description='image_export_cog',
    bucket='gcs-bucket-name',
    fileNamePrefix='image_export_cog',
    region=region,
    scale=30,
    crs='EPSG:5070',
    formatOptions={
        'cloudOptimized': True
    }
)
task.start()

# Define a nodata value and replace masked pixels with it using "unmask".
# Set the "sameFootprint" parameter as "false" to include pixels outside of the
# image geometry in the unmasking operation.
nodata_val = -9999
unmasked_image = image.unmask(value=nodata_val, sameFootprint=False)
# Use the "noData" key in the "formatOptions" parameter to set the nodata value
# (GeoTIFF format only).
task = ee.batch.Export.image.toCloudStorage(
    image=unmasked_image,
    description='image_export_nodata',
    bucket='gcs-bucket-name',
    fileNamePrefix='image_export_nodata',
    region=image.geometry(),  # full image bounds
    scale=2000,  # large scale for minimal demo
    crs='EPSG:5070',
    fileFormat='GeoTIFF',
    formatOptions={
       'noData': nodata_val
    }
)
task.start()