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ee.Image.constant
使用集合让一切井井有条
根据您的偏好保存内容并对其进行分类。
生成一个在各处都包含常量值的图片。
用法 | 返回 |
---|
ee.Image.constant(value) | 图片 |
参数 | 类型 | 详细信息 |
---|
value | 对象 | 常量图片中像素的值。必须是数字或数组,或数字或数组的列表。 |
示例
代码编辑器 (JavaScript)
// Create a constant image, where every pixel has bands of the same value.
var image1 = ee.Image.constant(1);
Map.addLayer(image1, null, '1');
// Image (1 band)
// type: Image
// bands: List (1 element)
// 0: "constant", int ∈ [1, 1], EPSG:4326
print(image1);
var image2 = ee.Image(2);
Map.addLayer(image2, null, '2');
// Image (1 band)
// type: Image
// bands: List (1 element)
// 0: "constant", int ∈ [2, 2], EPSG:4326
print(image2);
var π = ee.Image(Math.PI);
Map.addLayer(π, null, 'π');
// Image (1 band)
// type: Image
// bands: List (1 element)
// 0: "constant", double ∈ [3.141592653589793, 3.141592653589793], EPSG:4326
// id: constant
// crs: EPSG:4326
// crs_transform: [1,0,0,0,1,0]
// data_type: double ∈ [3.141592653589793, 3.141592653589793]
print(π);
// Create a multi-band image from a list of constant double integers.
var doubleIntImage = ee.Image.constant([-1.2, 4]);
Map.addLayer(doubleIntImage, null, 'double int');
// Image (2 bands)
// type: Image
// bands: List (2 elements)
// 0: "constant_0", double ∈ [-1.2, -1.2], EPSG:4326
// 1: "constant_1", int ∈ [4, 4], EPSG:4326
print(doubleIntImage);
// Create a multi-band image from a list of constants, using hexadecimal
// notation.
var multiband = ee.Image([0xff, 0x88, 0x00]);
Map.addLayer(multiband, {min: 0, max: 0xff}, 'orange');
// Image (3 bands)
// type: Image
// bands: List (3 elements)
// 0: "constant", int ∈ [255, 255], EPSG:4326
// 1: "constant_1", int ∈ [136, 136], EPSG:4326
// 2: "constant_2", int ∈ [0, 0], EPSG:4326
print(multiband);
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最后更新时间 (UTC):2025-07-26。
[null,null,["最后更新时间 (UTC):2025-07-26。"],[[["\u003cp\u003eGenerates an image where every pixel has the same specified value, creating a constant image.\u003c/p\u003e\n"],["\u003cp\u003eAccepts a number, an array, or a list of numbers/arrays as input to define the constant value for the image pixels.\u003c/p\u003e\n"],["\u003cp\u003eCan create single-band or multi-band images with constant values in each band.\u003c/p\u003e\n"],["\u003cp\u003eUses \u003ccode\u003eee.Image.constant(value)\u003c/code\u003e for construction, where 'value' represents the desired constant.\u003c/p\u003e\n"],["\u003cp\u003eCan be visualized using \u003ccode\u003eMap.addLayer()\u003c/code\u003e by providing the image and optional visualization parameters.\u003c/p\u003e\n"]]],[],null,["# ee.Image.constant\n\nGenerates an image containing a constant value everywhere.\n\n\u003cbr /\u003e\n\n| Usage | Returns |\n|----------------------------|---------|\n| `ee.Image.constant(value)` | Image |\n\n| Argument | Type | Details |\n|----------|--------|-------------------------------------------------------------------------------------------------------------|\n| `value` | Object | The value of the pixels in the constant image. Must be a number or an Array or a list of numbers or Arrays. |\n\nExamples\n--------\n\n### Code Editor (JavaScript)\n\n```javascript\n// Create a constant image, where every pixel has bands of the same value.\nvar image1 = ee.Image.constant(1);\nMap.addLayer(image1, null, '1');\n// Image (1 band)\n// type: Image\n// bands: List (1 element)\n// 0: \"constant\", int ∈ [1, 1], EPSG:4326\nprint(image1);\n\nvar image2 = ee.Image(2);\nMap.addLayer(image2, null, '2');\n// Image (1 band)\n// type: Image\n// bands: List (1 element)\n// 0: \"constant\", int ∈ [2, 2], EPSG:4326\nprint(image2);\n\nvar π = ee.Image(Math.PI);\nMap.addLayer(π, null, 'π');\n// Image (1 band)\n// type: Image\n// bands: List (1 element)\n// 0: \"constant\", double ∈ [3.141592653589793, 3.141592653589793], EPSG:4326\n// id: constant\n// crs: EPSG:4326\n// crs_transform: [1,0,0,0,1,0]\n// data_type: double ∈ [3.141592653589793, 3.141592653589793]\nprint(π);\n\n// Create a multi-band image from a list of constant double integers.\nvar doubleIntImage = ee.Image.constant([-1.2, 4]);\nMap.addLayer(doubleIntImage, null, 'double int');\n// Image (2 bands)\n// type: Image\n// bands: List (2 elements)\n// 0: \"constant_0\", double ∈ [-1.2, -1.2], EPSG:4326\n// 1: \"constant_1\", int ∈ [4, 4], EPSG:4326\nprint(doubleIntImage);\n\n// Create a multi-band image from a list of constants, using hexadecimal\n// notation.\nvar multiband = ee.Image([0xff, 0x88, 0x00]);\nMap.addLayer(multiband, {min: 0, max: 0xff}, 'orange');\n// Image (3 bands)\n// type: Image\n// bands: List (3 elements)\n// 0: \"constant\", int ∈ [255, 255], EPSG:4326\n// 1: \"constant_1\", int ∈ [136, 136], EPSG:4326\n// 2: \"constant_2\", int ∈ [0, 0], EPSG:4326\nprint(multiband);\n```"]]