| 用量 | 傳回 |
|---|---|
Image.arraySort(keys) | 圖片 |
| 引數 | 類型 | 詳細資料 |
|---|---|---|
這個：image | 圖片 | 要排序的陣列圖片。 |
keys | 圖片 (預設值：null) | 用於排序的選用鍵。如未提供，系統會將這些值做為鍵。索引鍵只能沿著一個軸向有多個元素，這會決定排序方向。 |
範例
程式碼編輯器 (JavaScript)
// A function to print arrays for a selected pixel in the following examples. function sampArrImg(arrImg) { var point = ee.Geometry.Point([-121, 42]); return arrImg.sample(point, 500).first().get('array'); } // Create a 1D array image with length 12. var arrayImg1D = ee.Image([0, 10, 6, 5, 4, 7, 11, 1, 2, 9, 8, 3]).toArray(); print('1D array image (pixel)', sampArrImg(arrayImg1D)); // [0, 10, 6, 5, 4, 7, 11, 1, 2, 9, 8, 3] // Sort the 1D array in ascending order. var arrayImg1DSorted = arrayImg1D.arraySort(); print('1D array image sorted (pixel)', sampArrImg(arrayImg1DSorted)); // [0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11] // You can use another array image to control sorting. The order of values // in the optional keys array translates to relative position in the input // array. For example, here is a keys array image with non-sequential values in // descending order, it will reverse the order of the input array; make the // last position first and the first position last. var keys1D = ee.Image([99, 98, 50, 45, 23, 18, 9, 8, 7, 5, 2, 0]).toArray(); print('1D array image keys (pixel)', sampArrImg(keys1D)); // [99, 98, 50, 45, 23, 18, 9, 8, 7, 5, 2, 0] var arrayImg1DSortedKeys = arrayImg1D.arraySort(keys1D); print('1D array image sorted by keys (pixel)', sampArrImg(arrayImg1DSortedKeys)); // [3, 8, 9, 2, 1, 11, 7, 4, 5, 6, 10, 0] // To sort a 2D array, the keys array image is required. // Create a 2D array image with 3 rows and 4 columns. var arrayImg2D = arrayImg1D.arrayReshape(ee.Image([3, 4]).toArray(), 2); print('2D array image (pixel)', sampArrImg(arrayImg2D)); // [[0, 10, 6, 5], // [4, 7, 11, 1], // [2, 9, 8, 3]] // Only a single axis can be sorted at a time. Here, we reverse sort along rows. // There are 4 elements in each row, so we construct an 1x4 array image. var keys2Drows = ee.Image([3, 2, 1, 0]).toArray().toArray(1).arrayTranspose(); print('2D array image row keys (pixel)', sampArrImg(keys2Drows)); // [[3, 2, 1, 0]] var arrayImg2DSortedRows = arrayImg2D.arraySort(keys2Drows); print('2D array image sorted rows (pixel)', sampArrImg(arrayImg2DSortedRows)); // [[5, 6, 10, 0], // [1, 11, 7, 4], // [3, 8, 9, 2]] // Reverse sort along columns, create a 3x1 keys array image with values in // descending order. var keys2Dcols = ee.Image([2, 1, 0]).toArray().toArray(1); print('2D array image column keys (pixel)', sampArrImg(keys2Dcols)); // [[2], // [1], // [0]] var arrayImg2DSortedCols = arrayImg2D.arraySort(keys2Dcols); print('2D array image sorted cols (pixel)', sampArrImg(arrayImg2DSortedCols)); // [[2, 9, 8, 3], // [4, 7, 11, 1], // [0, 10, 6, 5]]
import ee import geemap.core as geemap
Colab (Python)
# A function to print arrays for a selected pixel in the following examples. def samp_arr_img(arr_img): point = ee.Geometry.Point([-121, 42]) return arr_img.sample(point, 500).first().get('array') # Create a 1D array image with length 12. array_img_1d = ee.Image([0, 10, 6, 5, 4, 7, 11, 1, 2, 9, 8, 3]).toArray() print('1D array image (pixel):', samp_arr_img(array_img_1d).getInfo()) # [0, 10, 6, 5, 4, 7, 11, 1, 2, 9, 8, 3] # Sort the 1D array in ascending order. array_img_1d_sorted = array_img_1d.arraySort() print('1D array image sorted (pixel):', samp_arr_img(array_img_1d_sorted).getInfo()) # [0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11] # You can use another array image to control sorting. The order of values # in the optional keys array translates to relative position in the input # array. For example, here is a keys array image with non-sequential values in # descending order, it will reverse the order of the input array; make the # last position first and the first position last. keys_1d = ee.Image([99, 98, 50, 45, 23, 18, 9, 8, 7, 5, 2, 0]).toArray() print('1D array image keys (pixel):', samp_arr_img(keys_1d).getInfo()) # [99, 98, 50, 45, 23, 18, 9, 8, 7, 5, 2, 0] array_img_1d_sorted_keys = array_img_1d.arraySort(keys_1d) print('1D array image sorted by keys (pixel):', samp_arr_img(array_img_1d_sorted_keys).getInfo()) # [3, 8, 9, 2, 1, 11, 7, 4, 5, 6, 10, 0] # To sort a 2D array, the keys array image is required. # Create a 2D array image with 3 rows and 4 columns. array_img_2d = array_img_1d.arrayReshape(ee.Image([3, 4]).toArray(), 2) print('2D array image (pixel):', samp_arr_img(array_img_2d).getInfo()) # [[0, 10, 6, 5], # [4, 7, 11, 1], # [2, 9, 8, 3]] # Only a single axis can be sorted at a time. Here, we reverse sort along rows. # There are 4 elements in each row, so we construct an 1x4 array image. keys_2d_rows = ee.Image([3, 2, 1, 0]).toArray().toArray(1).arrayTranspose() print('2D array image row keys (pixel):', samp_arr_img(keys_2d_rows).getInfo()) # [[3, 2, 1, 0]] array_img_2d_sorted_rows = array_img_2d.arraySort(keys_2d_rows) print('2D array image sorted rows (pixel):', samp_arr_img(array_img_2d_sorted_rows).getInfo()) # [[5, 6, 10, 0], # [1, 11, 7, 4], # [3, 8, 9, 2]] # Reverse sort along columns, create a 3x1 keys array image with values in # descending order. keys_2d_cols = ee.Image([2, 1, 0]).toArray().toArray(1) print('2D array image column keys (pixel):', samp_arr_img(keys_2d_cols).getInfo()) # [[2], # [1], # [0]] array_img_2d_sorted_cols = array_img_2d.arraySort(keys_2d_cols) print('2D array image sorted cols (pixel):', samp_arr_img(array_img_2d_sorted_cols).getInfo()) # [[2, 9, 8, 3], # [4, 7, 11, 1], # [0, 10, 6, 5]]