ee.Image.clipToBoundsAndScale

将图片剪裁为几何图形的边界，并将剪裁后的图片缩放到特定尺寸或比例。

用法返回
Image.clipToBoundsAndScale(geometry, width, height, maxDimension, scale)图片
参数类型详细信息
此：input图片要剪裁和缩放的图片。
geometry几何图形，默认值：null用于剪裁图片的几何图形。图片将裁剪为相应几何图形在图片投影中的边界框。
width整数，默认值：null要将图片缩放到的宽度（以像素为单位）。必须与“height”一起提供。与“maxDimension”和“scale”互斥。
height整数，默认值：null要将图片缩放到的高度（以像素为单位）。必须与“width”一起提供。与“maxDimension”和“scale”互斥。
maxDimension整数，默认值：null要将图片缩放到的最大尺寸（以像素为单位）。与“width”“height”和“scale”互斥。
scale浮点数，默认值：null如果指定了比例，则通过将指定比例值除以图片投影中一米的标称大小来缩放投影。与“width”“height”和“maxDimension”互斥。

示例

代码编辑器 (JavaScript)

// A digital elevation model.
var dem = ee.Image('NASA/NASADEM_HGT/001');
var demVis = {bands: 'elevation', min: 0, max: 2000};
print('DEM', dem);
Map.setCenter(-121.38, 46.51, 8);
Map.addLayer(dem, demVis, 'DEM');

// Clip DEM by a single polygon geometry, specify width and height parameters.
var geom1 = ee.Geometry.BBox(-123.55, 46.61, -122.57, 46.98);
var demClip1 = dem.clipToBoundsAndScale({
  geometry: geom1,
  width: 20,  // pixels
  height: 10  // pixels
});
print('Clipped image retains metadata and band names', demClip1);
Map.addLayer(demClip1, demVis, 'Single geometry clip (width, height)');
Map.addLayer(geom1, {color: 'red'}, 'Single geometry (width, height)');

// Clip DEM by a single polygon geometry, specify maxDimension parameter.
var geom2 = ee.Geometry.BBox(-120.79, 46.58, -120.16, 46.81);
var demClip2 = dem.clipToBoundsAndScale({
  geometry: geom2,
  maxDimension: 5,  // pixels
});
Map.addLayer(demClip2, demVis, 'Single polygon clip (maxDimension)');
Map.addLayer(geom2, {color: 'yellow'}, 'Single polygon (maxDimension)');

// Clip DEM by a single polygon geometry, specify scale parameter.
var geom3 = ee.Geometry.BBox(-120.79, 46.18, -120.16, 46.41);
var demClip3 = dem.clipToBoundsAndScale({
  geometry: geom3,
  scale: 1e4,  // meters
});
Map.addLayer(demClip3, demVis, 'Single polygon clip (scale)');
Map.addLayer(geom3, {color: 'blue'}, 'Single polygon (scale)');

Python 设置

如需了解 Python API 和如何使用 geemap 进行交互式开发，请参阅 Python 环境页面。

import ee
import geemap.core as geemap

Colab (Python)

# A digital elevation model.
dem = ee.Image('NASA/NASADEM_HGT/001')
dem_vis = {'bands': 'elevation', 'min': 0, 'max': 2000}
display('DEM', dem)
m = geemap.Map()
m.set_center(-121.38, 46.51, 8)
m.add_layer(dem, dem_vis, 'DEM')

# Clip DEM by a single polygon geometry, specify width and height parameters.
geom_1 = ee.Geometry.BBox(-123.55, 46.61, -122.57, 46.98)
dem_clip_1 = dem.clipToBoundsAndScale(geometry=geom_1, width=20, height=10)
display('Clipped image retains metadata and band names', dem_clip_1)
m.add_layer(dem_clip_1, dem_vis, 'Single geometry clip (width, height)')
m.add_layer(geom_1, {'color': 'red'}, 'Single geometry (width, height)')

# Clip DEM by a single polygon geometry, specify maxDimension parameter.
geom_2 = ee.Geometry.BBox(-120.79, 46.58, -120.16, 46.81)
dem_clip_2 = dem.clipToBoundsAndScale(geometry=geom_2, maxDimension=5)
m.add_layer(dem_clip_2, dem_vis, 'Single polygon clip (maxDimension)')
m.add_layer(geom_2, {'color': 'yellow'}, 'Single polygon (maxDimension)')

# Clip DEM by a single polygon geometry, specify scale parameter.
geom_3 = ee.Geometry.BBox(-120.79, 46.18, -120.16, 46.41)
dem_clip_3 = dem.clipToBoundsAndScale(geometry=geom_3, scale=1e4)
m.add_layer(dem_clip_3, dem_vis, 'Single polygon clip (scale)')
m.add_layer(geom_3, {'color': 'blue'}, 'Single polygon (scale)')
m