/**
 * Polyline processing service for route geometry handling
 */
export interface GeoJSONLineString {
    type: 'LineString';
    coordinates: Array<[number, number]>;
}
export interface DecodedPolyline {
    coordinates: Array<[number, number]>;
    bounds: {
        north: number;
        south: number;
        east: number;
        west: number;
    };
}
export interface PolylineData {
    encoded: string;
    decoded: DecodedPolyline;
    geojson: GeoJSONLineString;
    coordinateCount: number;
}
export declare class PolylineService {
    /**
     * Decode a polyline string to coordinates
     */
    decode(encoded: string): DecodedPolyline;
    /**
     * Process polyline data from OneMap response
     */
    processPolylines(response: any): PolylineData[];
    /**
     * Create GeoJSON LineString from coordinates
     */
    private createGeoJSON;
    /**
     * Calculate bounding box for coordinates
     */
    private calculateBounds;
    /**
     * Estimate coordinate count from encoded polyline
     */
    estimateCoordinateCount(encoded: string): number;
    /**
     * Create step markers for instructions
     */
    createStepMarkers(instructions: any[]): Array<{
        step: number;
        coordinates: [number, number];
        instruction: string;
    }>;
}