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ui.Chart.image.doySeriesByRegion
使用集合让一切井井有条
根据您的偏好保存内容并对其进行分类。
根据 ImageCollection 生成图表。绘制给定波段在不同区域中于每年各天的派生值。
- X 轴：一年中的某天（从 startDay 到 endDay，默认值为 1 到 366）。
- Y 轴：派生频段值（在区域内和不同年份间均有所减少）。
- 系列：地区。
返回图表。
| 用法 | 返回 |
|---|
ui.Chart.image.doySeriesByRegion(imageCollection, bandName, regions, regionReducer, scale, yearReducer, seriesProperty, startDay, endDay) | ui.Chart |
| 参数 | 类型 | 详细信息 |
|---|
imageCollection | ImageCollection | 要绘制图表的 ImageCollection。 |
bandName | Number|String | 要绘制的频段的名称。 |
regions | Feature|FeatureCollection|Geometry|List<Feature>|List<Geometry> | 要缩减的区域。 |
regionReducer | Reducer，可选 | 用于汇总区域内频段值的 Reducer。必须返回单个值。默认值为 ee.Reducer.mean()。 |
scale | 数字，可选 | 缩放以与区域缩小器搭配使用（以米为单位）。 |
yearReducer | Reducer，可选 | 用于汇总各年份（针对指定一年中的某一天）频段值的缩减器。必须返回单个值。默认值为 ee.Reducer.mean()。 |
seriesProperty | 字符串，可选 | opt_regions 中用于序列标签的功能的属性。默认为“system:index”。 |
startDay | 数字，可选 | 系列开始的年份日期。必须介于 1 到 366 之间。 |
endDay | 数字，可选 | 结束序列的年份日期。必须介于 startDay 和 366 之间。 |
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最后更新时间 (UTC)：2025-07-25。
[null,null,["最后更新时间 (UTC)：2025-07-25。"],[[["\u003cp\u003eGenerates a chart that visualizes the temporal variation of a specific band's value within different regions throughout a year, derived from an ImageCollection.\u003c/p\u003e\n"],["\u003cp\u003eThe chart displays the day of year on the x-axis, the derived band value on the y-axis, and uses separate series to represent different regions.\u003c/p\u003e\n"],["\u003cp\u003eUsers can customize the chart by specifying the band, regions, aggregation methods (reducers) for both region and year, scale, series labels, and the start and end days of the year to be included.\u003c/p\u003e\n"]]],["This function generates a chart from an ImageCollection, plotting band values across different regions and days of the year. It requires an `imageCollection`, `bandName`, and `regions`. It aggregates band values within regions using `regionReducer` and across years using `yearReducer`. The x-axis represents the day of the year (`startDay` to `endDay`), and the y-axis displays the reduced band value. Regions are represented as separate series, identified by `seriesProperty`. The function returns a `ui.Chart`.\n"],null,["# ui.Chart.image.doySeriesByRegion\n\n\u003cbr /\u003e\n\nGenerates a Chart from an ImageCollection. Plots the derived value of the given band in different regions at each day-of-year.\n\n\u003cbr /\u003e\n\n- X-axis: Day of year (startDay to endDay, defaults to 1 to 366).\n\n- Y-axis: Derived band value (reduced within the region and across years).\n\n- Series: Regions.\n\nReturns a chart.\n\n| Usage | Returns |\n|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------|----------|\n| `ui.Chart.image.doySeriesByRegion(imageCollection, bandName, regions, `*regionReducer* `, `*scale* `, `*yearReducer* `, `*seriesProperty* `, `*startDay* `, `*endDay*`)` | ui.Chart |\n\n| Argument | Type | Details |\n|-------------------|-------------------------------------------------------------------------|----------------------------------------------------------------------------------------------------------------------------------------|\n| `imageCollection` | ImageCollection | The ImageCollection to chart. |\n| `bandName` | Number\\|String | The name of the band to chart. |\n| `regions` | Feature\\|FeatureCollection\\|Geometry\\|List\\\u003cFeature\\\u003e\\|List\\\u003cGeometry\\\u003e | The regions to reduce. |\n| `regionReducer` | Reducer, optional | Reducer for aggregating band values within the region. Must return a single value. Defaults to ee.Reducer.mean(). |\n| `scale` | Number, optional | Scale to use with the region reducer in meters. |\n| `yearReducer` | Reducer, optional | Reducer for aggregating band values across years (for a given day of year). Must return a single value. Defaults to ee.Reducer.mean(). |\n| `seriesProperty` | String, optional | Property of features in opt_regions to be used for series labels. Defaults to 'system:index'. |\n| `startDay` | Number, optional | Day of year to start the series. Must be between 1 and 366. |\n| `endDay` | Number, optional | Day of year to end the series. Must be between startDay and 366. |"]]
