exportImage() {
    var filename = this.getFilename();
    var params = this.getYearParam();
    params.coordinates = JSON.stringify(this.getPolygonCoordinates());
    params.filename = filename;
    params.client_id = this.clientId;
    this.setAlert(
        'export-' + filename, 'info',
        'Export of "' + filename + '" in progress.');
    exporter.App.handleRequest(
        $.post('/export', params), null,
        this.setAlert.bind(
            this, 'export-' + filename, 'danger', 'Export failed.'));
  }
Exports the currently configured image to Drive.
When the exported image is ready, it will be shared with the current user.