Google Earth engine (GEE) -- Comparative Case Analysis of calculating slope with different methods

This paper is mainly through the algorithm calculation slope And calculate with yourself according to the kernel function slope See the difference between the two

There are several properties to understand ：

ee.Kernel.fixed(width, height, weights, x, y, normalize)

Create the kernel ： Set length and width , The weight ,x,y Offset position on , That is, the general default in the lower left corner of the regression , Normalize kernel values , Make it sum up for 1

Creates a Kernel.

Arguments:

width (Integer, default: -1):

The width of the kernel in pixels.

height (Integer, default: -1):

The height of the kernel in pixels.

weights (List):

A 2-D list of [height] x [width] values to use as the weights of the kernel.

x (Integer, default: -1):

The location of the focus, as an offset from the left.

y (Integer, default: -1):

The location of the focus, as an offset from the top.

normalize (Boolean, default: false):

Normalize the kernel values to sum