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April 27, 2026 or will use the Community Tier by default. Tier quotas will take effect for all projects (regardless of tier selection date) on
April 27, 2026.
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ee.ImageCollection.formaTrend
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Computes the long and short term trends of a time series or optionally, the trends of the ratio of the time series and a covariate. The long term trend is estimated from the linear term of a regression on the full time series. The short term trend is computed as the windowed minimum over the time series.
The time series and covariate series are expected to contain a single band each, and the time series is expected to be evenly spaced in time. The output is 4 float bands: the long and short term trends, the t-test of the long term trend against the time series, and the Bruce Hansen test of parameter stability.
| Usage | Returns | ImageCollection.formaTrend(covariates, windowSize) | Image |
| Argument | Type | Details | this: timeSeries | ImageCollection | Collection from which to extract trends. |
covariates | ImageCollection, default: null | Cofactors to use in the trend analysis. |
windowSize | Integer, default: 6 | Short term trend analysis window size, in images. |
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Last updated 2024-07-13 UTC.
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