/**
 * AIS记录
 */
export interface AISRecord {
    mmsi?: number;
    name?: string;
    imo?: number;
    callSign?: string;
    lat?: number;
    lng?: number;
    length?: number;
    width?: number;
    draught?: number;
    sog?: number;
    cog?: number;
    hdg?: number;
    rot?: number;
    eta?: number;
    destination?: string;
    positionTime?: number;
    status?: number;
    labelCn?: string;
    labelEn?: string;
    method?: string;
    vendor?: string;
    deleted?: boolean;
    utc?: string;
    meteo?: string;
    type?: string;
}
export declare class AisHelper {
    static json2Str(json: AISRecord): string;
    static str2Json(str: string): AISRecord;
    static inspectStoppages(rows: AISRecord[], threshold?: number, onlyAis?: boolean): any[];
    /**
     * 计算轨迹摘要
     * @param rows
     * @param stm
     * @param etm
     */
    static inspectSummary(rows: AISRecord[], stm: string, etm: string): {
        distance: number;
        interval: number;
        avgSpd: number;
    };
}