et("standard");
                break;
            case 'monochromatic':
                style_source = mapstyle.get("monochromatic");
                break;
            default:
                style_source = mapstyle.get("standard");
        }

        map.setStyle(style_source, {
            transformStyle: (previousStyle, nextStyle) => ({
                ...nextStyle,
                sources: {
                    ...nextStyle.sources,
                    'activities': previousStyle.sources.activities,
