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PyramidingPolicy
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建立影像帶低解析度版本時要使用的演算法。根據預設,遮罩會計算為輸入遮罩的平均值,反映計算要求輸出統計資料時,輸入資料的總權重。如果是 SAMPLE,系統會直接使用取樣像素的遮罩。
列舉 |
PYRAMIDING_POLICY_UNSPECIFIED |
不指定。 |
MEAN |
輸出像素是輸入像素的遮罩加權平均值。應適用於直接觀察結果和連續量值,例如溫度。 |
SAMPLE |
輸出像素與左上方的輸入像素相同。應適用於 QA/位元遮罩頻帶,或其他非連續欄位,例如像素擷取日期。 |
MIN |
輸出像素是輸入像素的最小值。 |
MAX |
輸出像素是輸入像素的最大值。 |
MODE |
輸出像素是輸入像素的遮罩加權模式。應適用於土地覆蓋帶。 |
MEDIAN |
輸出像素是輸入像素的遮罩加權中位數。如果值相同,則使用中間兩個值的平均值。 |
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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\u003eThe pyramiding policy determines how reduced-resolution versions of image bands are created, impacting the representation of pixel values at lower resolutions.\u003c/p\u003e\n"],["\u003cp\u003eBy default, the \u003ccode\u003eMEAN\u003c/code\u003e policy is used, calculating the output pixel as the average of input pixels, weighted by their masks, ideal for continuous data like temperature.\u003c/p\u003e\n"],["\u003cp\u003eAlternative policies like \u003ccode\u003eSAMPLE\u003c/code\u003e, \u003ccode\u003eMIN\u003c/code\u003e, \u003ccode\u003eMAX\u003c/code\u003e, \u003ccode\u003eMODE\u003c/code\u003e, and \u003ccode\u003eMEDIAN\u003c/code\u003e offer different methods for pixel value determination, catering to various data types such as QA bands, categorical data, and more.\u003c/p\u003e\n"],["\u003cp\u003e\u003ccode\u003eSAMPLE\u003c/code\u003e policy directly uses the upper-left input pixel for the output, suitable for non-continuous fields like date of acquisition or QA bitmask bands.\u003c/p\u003e\n"],["\u003cp\u003eUsers can choose the most appropriate policy depending on the nature of the data and desired outcome for image reduction.\u003c/p\u003e\n"]]],[],null,["# PyramidingPolicy\n\nThe algorithm to be used when creating reduced-resolution versions of an image band. By default, the mask is computed as the MEAN of the input masks, reflecting the total weight of the input data over which the requested output statistic was calculated. In the case of SAMPLE, the sampled pixel's mask is used directly.\n\n| Enums ||\n|---------------------------------|-------------------------------------------------------------------------------------------------------------------------------------------------------------|\n| `PYRAMIDING_POLICY_UNSPECIFIED` | Not specified. |\n| `MEAN` | Output pixel is the mask-weighted mean of the input pixels. Should be used for direct observation results and continuous quantities like temperature. |\n| `SAMPLE` | Output pixel is identical to the upper-left input pixel. Should be used for QA/bitmask bands or other non-continuous fields like date of pixel acquisition. |\n| `MIN` | Output pixel is the minimum value of the input pixels. |\n| `MAX` | Output pixel is the maximum value of the input pixels. |\n| `MODE` | Output pixel is the mask-weighted mode of the input pixels. Should be used for landcover bands. |\n| `MEDIAN` | Output pixel is the mask-weighted median of the input pixels. In case of a tie, the mean of the middle two values is used. |"]]