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ui.Chart.image.doySeriesByYear
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。绘制区域中给定波段在不同年份中每天的派生值。
- X 轴:一年中的某天(从 startDay 到 endDay,默认值为 1 到 366)。
- Y 轴:派生的频段值(在区域内减少)。
- 系列:年份。
返回图表。
用法 | 返回 |
---|
ui.Chart.image.doySeriesByYear(imageCollection, bandName, region, regionReducer, scale, sameDayReducer, 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。 |
region | Feature|FeatureCollection|Geometry,可选 | 要缩减的区域。默认值为图片集合中所有几何图形的并集。 |
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)。 |
sameDayReducer | Reducer,可选 | 用于汇总具有相同(DoY、年)对的多个图像中的波段值的缩减器。必须返回单个值。默认值为 ee.Reducer.mean()。 |
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):2025-07-26。
[null,null,["最后更新时间 (UTC):2025-07-26。"],[[["\u003cp\u003e\u003ccode\u003eui.Chart.image.doySeriesByYear\u003c/code\u003e generates a chart that displays the derived value of a specific band within a region over time, plotted by day-of-year across multiple years.\u003c/p\u003e\n"],["\u003cp\u003eThe chart's x-axis represents the day of year, the y-axis represents the derived band value (after regional reduction), and different series represent different years in the dataset.\u003c/p\u003e\n"],["\u003cp\u003eUsers can customize the chart by specifying the image collection, band name, region of interest, reducers for regional and same-day aggregation, and the start and end days of the year for the analysis.\u003c/p\u003e\n"],["\u003cp\u003eDefault values are provided for region, reducers, and start/end days, offering flexibility and convenience for generating the chart with minimal required input.\u003c/p\u003e\n"]]],[],null,["\u003cbr /\u003e\n\nGenerates a Chart from an ImageCollection. Plots the derived value of the given band in a region for each day-of-year across different years.\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).\n\n- Series: Years.\n\nReturns a chart.\n\n| Usage | Returns |\n|----------------------------------------------------------------------------------------------------------------------------------------------------------|----------|\n| `ui.Chart.image.doySeriesByYear(imageCollection, bandName, `*region* `, `*regionReducer* `, `*scale* `, `*sameDayReducer* `, `*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| `region` | Feature\\|FeatureCollection\\|Geometry, optional | The region to reduce. Defaults to the union of all geometries in the image collection. |\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| `sameDayReducer` | Reducer, optional | Reducer for aggregating band values across images with the same (DoY, year) pair. Must return a single value. Defaults to ee.Reducer.mean(). |\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. |"]]