Google Earth engine (GEE) -- calculate the location of the center point, the external boundary, the external polygon, fuse and simplify the boundary and return it to the vector set

This time the tutorial is very simple, is me map This vector set to realize our attribute value is to establish function Then let each part of the vector set traverse the whole function , Here we can choose to find the center point of the vector , Of course, you can also add other things .

centroid(maxError, proj)

Returns a feature containing the point at the center of the highest-dimension components of the geometry of a feature. Lower-dimensional components are ignored, so the centroid of a geometry containing two polygons, three lines and a point is equivalent to the centroid of a geometry containing just the two polygons.

Arguments:

this:feature (Element):

Calculates the centroid of this feature's default geometry.

maxError (ErrorMargin, default: null):

The maximum amount of error tolerated when performing any necessary reprojection.

proj (Projection, default: null):

If specified, the result will be in this projection. Otherwise it will be in WGS84.

Returns: Feature

centroid(maxError, proj)
Returns a feature that contains the point at the center of the highest dimensional component of the geometry . Low dimensional components will be ignored , So one contains two