ee.Image.constant

產生圖片，其中各處都包含常數值。

用量	傳回
ee.Image.constant(value)	圖片

引數	類型	詳細資料
value	物件	常數圖片中的像素值。必須是數字、陣列、數字清單或陣列清單。

範例

程式碼編輯器 (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);