ee.Image.arrayPad

Pads the array values in each pixel to be a fixed length. The pad value will be appended to each array to extend it to given length along each axis. All bands of the image must be array-valued and have the same dimensions.

Usage	Returns
Image.arrayPad(lengths, pad)	Image

Argument	Type	Details
this: image	Image	Array image to pad.
lengths	List	A list of desired lengths for each axis in the output arrays. Arrays are already as large or larger than the given length will be unchanged along that axis
pad	Number, default: 0	The value to pad with.