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Let's say I have two 1-band images image1 and image2. Is there a difference between

ee.ImageCollection([image1, image2]).mosaic()

and

image1.blend(image2)

1 Answer 1

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From a mathematical image-processing perspective, they are the same operation — .mosaic() is just the version that is intended for processing an arbitrary collection, and .blend() is convenient when you only have two images only.

However, their handling of image bands is different: .blend() will replicate a single-band image to match the bands of a multi-band image, but mosaicing a collection requires that all images have the same set of band names.

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