ee.Image.spectralDistance

Computes the per-pixel spectral distance between two images. If the images are array based then only the first band of each image is used; otherwise all bands are involved in the distance computation. The two images are therefore expected to contain the same number of bands or have the same 1-dimensional array length.

Usage	Returns
Image.spectralDistance(image2, metric)	Image

Argument	Type	Details
this: image1	Image	The first image.
image2	Image	The second image.
metric	String, default: "sam"	The spectral distance metric to use. One of 'sam' (spectral angle mapper), 'sid' (spectral information divergence), 'sed' (squared Euclidean distance), or 'emd' (earth movers distance).