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How to apply a function to an imagecollection?
Mapping over an ImageCollection To apply a function to every Image in an ImageCollection use imageCollection.map (). The only argument to map () is a function which takes one parameter: an ee.Image. For example, the following code adds a timestamp band to every image in the collection:
How to map a function over a collection?
// Map the function over the collection and display the result. Note that in the predefined function, the metadata () method is used to create a new Image from the value of a property.
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 map an imagecollection in Google Earth?
For example: // Load a Landsat 8 collection for a single path-row. // the solar elevation > 40 degrees. Otherwise it returns a zero image. // Map the function over the collection, convert to a List and print the result.
How to reduce imagecollection in Google Earth Engine?
// Load an image collection, filtered so it’s not too much data. // Compute the median in each band, each pixel. // The output is an Image. Add it to the map. This returns a multi-band Image, each pixel of which is the median of all unmasked pixels in the ImageCollection at that pixel location.
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):
How to convert an image list to an imagecollection?
// Convert the image List to an ImageCollection. The animation resulting from this collection is less noisy, as each image represents the median of a 16-day NDVI composite for 20+ years of data (Figure 1b). See this tutorial for more information on this animation.