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ee.Algorithms.Landsat.pathRowLimit
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将请求限制为 Landsat 场景的 ImageCollection，以便为每个请求返回可控制数量的最佳场景。此参数旨在与统计算法（例如中位数合成）搭配使用，这些算法需要一定数量的优质数据才能获得理想效果，但如果数据量超出此范围，效果不会明显提升，反而会不必要地增加费用。默认实参会选择大约一年的优质数据。
请注意，在极少数情况下，当图块边界与 Landsat WRS 单元格边界对齐时，相邻图块的查询可能会产生冲突的结果。因此，此算法只能与能够容忍这些不一致性的统计方法搭配使用。
| 用法 | 返回 |
|---|
ee.Algorithms.Landsat.pathRowLimit(collection, maxScenesPerPathRow, maxScenesTotal) | ImageCollection |
| 参数 | 类型 | 详细信息 |
|---|
collection | ImageCollection | 要限制的 Landsat ImageCollection。 |
maxScenesPerPathRow | 整数，默认值：25 | 每个轨道/行返回的场景数量上限。 |
maxScenesTotal | 整数，默认值：100 | 每个请求返回的场景总数上限。 |
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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\u003eLimits the number of Landsat images returned from a query to ensure efficient processing for statistical analysis.\u003c/p\u003e\n"],["\u003cp\u003ePrioritizes the selection of high-quality scenes within a specified timeframe, typically around one year.\u003c/p\u003e\n"],["\u003cp\u003eAllows customization of the maximum number of scenes per path/row and the total number of scenes returned.\u003c/p\u003e\n"],["\u003cp\u003eIs designed for statistical algorithms that require a sufficient amount of data but are not significantly improved by excessive data.\u003c/p\u003e\n"],["\u003cp\u003eMay produce slightly inconsistent results for adjacent tiles in rare cases due to Landsat WRS cell boundaries.\u003c/p\u003e\n"]]],[],null,["# ee.Algorithms.Landsat.pathRowLimit\n\nLimits requests to an ImageCollection of Landsat scenes to return a controllable number of the best scenes for each request. This is intended for use with statistical algorithms like median composites that need a certain amount of good data to perform well, but that do not benefit substantially from additional data beyond that while becoming needlessly expensive. The default arguments select approximately one year's worth of good data.\n\n\u003cbr /\u003e\n\nNote that in rare circumstances, when the tile boundary aligns with a Landsat WRS cell boundary, queries for adjacent tiles may yield conflicting results. This is why it is important that this algorithm only be used with statistical methods that can tolerate these inconsistencies.\n\n| Usage | Returns |\n|------------------------------------------------------------------------------------------------|-----------------|\n| `ee.Algorithms.Landsat.pathRowLimit(collection, `*maxScenesPerPathRow* `, `*maxScenesTotal*`)` | ImageCollection |\n\n| Argument | Type | Details |\n|-----------------------|-----------------------|-------------------------------------------------------|\n| `collection` | ImageCollection | The Landsat ImageCollection to limit. |\n| `maxScenesPerPathRow` | Integer, default: 25 | The max number of scenes to return per path/row. |\n| `maxScenesTotal` | Integer, default: 100 | The max number of scenes to return per request total. |"]]
