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How to composite images in an imagecollection?
To composite images in an ImageCollection, use imageCollection.reduce (). This will composite all the images in the collection to a single image representing, for example, the min, max, mean or standard deviation of the images. (See the Reducers section for more information about reducers).
Which is an example of reducing an imagecollection?
For an example of reducing an ImageCollection, consider a collection of Landsat 5 images, filtered by path and row. The following code uses reduce () to reduce the collection to one Image (here a median reducer is used simply for illustrative purposes):
What happens when you reduce an imagecollection in Google Earth?
In particular, note that images produced by reducing an ImageCollection have no projection. This means that you should explicitly set the scale on any computations involving computed images output by an ImageCollection reduction. Figure 2. A false color composite of the median of Landsat 5 scenes in 2008.
Is the output of an imagecollection constant?
Inspect the list of images in the output ImageCollection and note that the when the condition evaluated by the If () algorithm is true, the output contains a constant image.
How to iterate over an imagecollection in Google Earth?
With each call to iterate (), the anomaly is added to the running sum and the result is added to the list. The final result is passed to the ImageCollection constructor to get a new sequence of images: // Load MODIS EVI imagery. // Define reference conditions from the first 10 years of data.
Which is function applies to every image in a collection?
Although map () applies a function to every image in a collection, the function visits every image in the collection independently. For example, suppose you want to compute a cumulative anomaly ( At) at time t from a time series.
How to map list of dates in Google Earth?
My function fnc returns as Image but on using the ee.ImageCollection (dates.map (fnc)), it returns an error ImageCollection (Error) ImageCollection.fromImages: Attempt to create an ImageCollection with non-image elements. in the code below.