function GroundGeometryUpdater(options) {
  GeometryUpdater.call(this, options);

  this._zIndex = 0;
  this._terrainOffsetProperty = undefined;
}
An abstract class for updating ground geometry entities.
@constructor
@alias GroundGeometryUpdater
@param {object} options An object with the following properties:
@param {Entity} options.entity The entity containing the geometry to be visualized.
@param {Scene} options.scene The scene where visualization is taking place.
@param {object} options.geometryOptions Options for the geometry
@param {string} options.geometryPropertyName The geometry property name
@param {string[]} options.observedPropertyNames The entity properties this geometry cares about