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ee.Algorithms.Terrain
透過集合功能整理內容
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從地形 DEM 計算坡度、坡向和簡單的陰影。
圖片應包含以公尺為單位的單一海拔高度帶，或多個帶 (其中一個帶的名稱為「elevation」)。新增以度為單位的「坡度」和「方位」輸出波段，以及用於視覺化的「山陰」無符號位元組輸出波段。所有其他波段和中繼資料都會從輸入圖片複製。系統會使用每個像素的 4 連通鄰域計算局部漸層，因此圖片邊緣會出現遺漏值。
| 用量 | 傳回 |
|---|
ee.Algorithms.Terrain(input) | 圖片 |
| 引數 | 類型 | 詳細資料 |
|---|
input | 圖片 | 海拔高度圖片，單位為公尺。 |
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上次更新時間：2025-07-26 (世界標準時間)。
[null,null,["上次更新時間：2025-07-26 (世界標準時間)。"],[[["\u003cp\u003eCalculates slope, aspect, and hillshade from a Digital Elevation Model (DEM) image.\u003c/p\u003e\n"],["\u003cp\u003eOutputs derived bands named 'slope' and 'aspect' in degrees, and 'hillshade' for visualization, while retaining other bands and metadata.\u003c/p\u003e\n"],["\u003cp\u003eEmploys a 4-connected neighborhood for gradient computation, leading to potential missing values along image edges.\u003c/p\u003e\n"],["\u003cp\u003eRequires an input image containing either a single elevation band in meters or a multi-band image with an elevation band named 'elevation'.\u003c/p\u003e\n"],["\u003cp\u003eAccessible via the \u003ccode\u003eee.Algorithms.Terrain(input)\u003c/code\u003e function, returning a processed image.\u003c/p\u003e\n"]]],["The function processes an elevation image (in meters) to compute and add three new bands: 'slope' (degrees), 'aspect' (degrees), and 'hillshade' (unsigned byte). It calculates the local gradient using the four directly connected neighboring pixels. Missing values will occur around image edges due to the four-connected neighbor method. The input image's other bands and metadata are preserved. The function takes an elevation image as input and returns a processed image.\n"],null,["# ee.Algorithms.Terrain\n\nCalculates slope, aspect, and a simple hillshade from a terrain DEM.\n\n\u003cbr /\u003e\n\nExpects an image containing either a single band of elevation, measured in meters, or if there's more than one band, one named 'elevation'. Adds output bands named 'slope' and 'aspect' measured in degrees plus an unsigned byte output band named 'hillshade' for visualization. All other bands and metadata are copied from the input image. The local gradient is computed using the 4-connected neighbors of each pixel, so missing values will occur around the edges of an image.\n\n| Usage | Returns |\n|--------------------------------|---------|\n| `ee.Algorithms.Terrain(input)` | Image |\n\n| Argument | Type | Details |\n|----------|-------|--------------------------------|\n| `input` | Image | An elevation image, in meters. |"]]
