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ee.Algorithms.TemporalSegmentation.VCT
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植被变化追踪器,一种使用密集 Landsat 时间序列堆栈重建近期森林扰动历史记录的自动化方法。
输出是每个像素的二维数组,包含 6 行 x N 年。输出行包含:输入年份、VCT 土地覆盖掩码、UD 复合的幅度、B4 中的扰动幅度、NDVI 中的扰动幅度、dNBR 中的扰动幅度。
请参阅:Huang, C.、Goward, S.N.、Masek, J.G.,Thomas, N.,Zhu, Z. 和 Vogelmann, J.E.,2010 年。一种使用密集 Landsat 时间序列堆栈重建近期森林扰动历史记录的自动化方法。Remote Sensing of Environment, 114(1), pp.183-198.
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ee.Algorithms.TemporalSegmentation.VCT(timeSeries, landCover, maxUd, minNdvi, forThrMax, nYears) | 图片 |
参数 | 类型 | 详细信息 |
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timeSeries | ImageCollection | 用于提取 VCT 扰动的集合,包含以下波段:B3、B4、B5、B7、热红外、NDVI、DNBR 和 COMP。此集合预计包含每年 1 张图片,按时间排序。 |
landCover | ImageCollection | 要从中提取 VCT 掩码的集合。此集合应包含 timeSeries 中每张图片对应的一张图片,并按时间排序。 |
maxUd | 浮点数,默认值:4 | 用于检测森林的最大 Z 分数复合值。 |
minNdvi | 浮点数,默认值:0.45 | 森林的最低 NDVI 值。 |
forThrMax | 浮点数,默认值:3 | 森林的最大阈值。 |
nYears | 整数,默认值:30 | 最长年限。 |
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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\u003eThe Vegetation Change Tracker (VCT) automatically reconstructs forest disturbance history using dense Landsat time series stacks.\u003c/p\u003e\n"],["\u003cp\u003eVCT identifies disturbances by analyzing changes in spectral indices like NDVI, dNBR, and UD composite over time.\u003c/p\u003e\n"],["\u003cp\u003eThe output provides a per-pixel disturbance magnitude for each year within the analyzed Landsat time series.\u003c/p\u003e\n"],["\u003cp\u003eUsers can customize parameters like maximum UD composite value and minimum NDVI for forest detection.\u003c/p\u003e\n"],["\u003cp\u003eVCT requires input Landsat time series collections with specific bands, including B3, B4, B5, B7, thermal, NDVI, DNBR, and COMP.\u003c/p\u003e\n"]]],["Vegetation Change Tracker (VCT) reconstructs forest disturbance history using Landsat time series. It requires yearly image collections of `timeSeries` (containing specific bands) and `landCover` to produce a per-pixel 2D array. This array contains information for each year, including the VCT landcover mask, and the magnitude of disturbances based on UD composite, B4, NDVI, and dNBR. VCT's function can be customized by using arguments like `maxUd`, `minNdvi`, `forThrMax`, and `nYears`.\n"],null,["# ee.Algorithms.TemporalSegmentation.VCT\n\nVegetation Change Tracker, an automated approach for reconstructing recent forest disturbance history using dense Landsat time series stacks.\n\n\u003cbr /\u003e\n\nThe output is a 2D array per pixel containing 6 rows x N years. The output rows contain: input years, VCT landcover mask, magnitude in term of the UD composite, magnitude of distubance in B4, magnitude of distubance in NDVI, magnitude of distubance in dNBR.\n\nSee: Huang, C., Goward, S.N., Masek, J.G., Thomas, N., Zhu, Z. and Vogelmann, J.E., 2010. An automated approach for reconstructing recent forest disturbance history using dense Landsat time series stacks. Remote Sensing of Environment, 114(1), pp.183-198.\n\n| Usage | Returns |\n|-----------------------------------------------------------------------------------------------------------------------|---------|\n| `ee.Algorithms.TemporalSegmentation.VCT(timeSeries, landCover, `*maxUd* `, `*minNdvi* `, `*forThrMax* `, `*nYears*`)` | Image |\n\n| Argument | Type | Details |\n|--------------|----------------------|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|\n| `timeSeries` | ImageCollection | Collection from which to extract VCT disturbances, containing the bands: B3, B4, B5, B7, thermal, NDVI, DNBR, and COMP. This collection is expected to contain 1 image for each year, sorted by time. |\n| `landCover` | ImageCollection | Collection from which to extract VCT masks. This collection is expected to contain 1 image for each image in the timeSeries, sorted by time. |\n| `maxUd` | Float, default: 4 | Maximum Z-score composite value for detecting forest. |\n| `minNdvi` | Float, default: 0.45 | Minimum NDVI value for forest. |\n| `forThrMax` | Float, default: 3 | Maximum threshold for forest. |\n| `nYears` | Integer, default: 30 | Maximum number of years. |"]]