_checkForModifiedImageryConfigurations() {
    if (this._imageryConfigurationsModified()) {
      this._updateImageryConfigurations();
      const model = this._model;
      model.resetDrawCommands();
    }
  }
Check whether any of the settings of any imagery layer (like alpha
or hue) has been changed since the last call to the <code>update</code>
function.

If this is the case, the draw commands of the model will be reset.