海洋风力预警数据

风力大小对船舶作业及行驶安全有着重要的影响，船上需要提前预知船舶所在地的风力，系统会根据用户设置的预警值给用户报警提示，辅助船长做好安全管理。1.首先未来获取三天内的风速和风向的气象信息，然后筛选出那些符合大风预警（大于20m/s）的气象信息，把这些气象信息存入缓存中用于后续计算。 2.计算未来船位：先根据船位的航速乘于一小时，算出下一小时航行的距离，再根据这个距离和当前船位的航向和经纬度点计算出船舶下一个小时的经纬点。 其他时间以此类推计算。 3.大风情况判断：把计算获得的未来船舶的经纬度位置存入数据库，根据船舶航行到这个经纬度点所对应的时间去查询风向、风速信息，如果超过了报警阈值（报警阈值为20m/s），则给此船用户大风预警。 4.如果船位的航速大于5节则20分钟计算一次，如果船位的航速小于5节但是大于0则1个小时计算一次。Wind conditions, particularly wind speed, exert a substantial impact on ship operations and navigational safety. Vessels must obtain advance wind information at their current operating location, and the system will trigger alerts to users based on the pre-set warning thresholds to assist the captain in implementing effective safety management. 1. First, acquire meteorological data including wind speed and direction for the upcoming three days. Then, filter out meteorological records that meet gale warning criteria (wind speed > 20 m/s), and store these filtered data in a cache for subsequent computational processes. 2. Future ship position calculation: First, calculate the travel distance in the subsequent hour based on the ship's speed multiplied by one hour. Then, compute the latitude and longitude coordinates of the ship's position after one hour using this travel distance, combined with the ship's current heading and original latitude/longitude coordinates. This same calculation logic is applied for all other time intervals. 3. Gale condition judgment: Store the calculated future latitude and longitude positions of the ship in a database. Query the corresponding wind direction and speed data based on the time when the ship arrives at these coordinates. If the measured wind speed exceeds the pre-configured warning threshold (20 m/s), send a gale warning to the user associated with this vessel. 4. Calculation frequency adjustment: Perform position calculations once every 20 minutes when the ship's speed is greater than 5 knots; when the ship's speed is greater than 0 but less than 5 knots, perform calculations once every hour.