卫星云图是气象预报的重要资源之一,可以显示云层的生消变化,对气象分析和预报工作有极大的作用.对云图进行一定时间段的预测有助于及时掌握云层的移动轨迹和变化情况,提高卫星云图资料的实用性.然而,当前卫星云图的预测面临诸多困难,例...卫星云图是气象预报的重要资源之一,可以显示云层的生消变化,对气象分析和预报工作有极大的作用.对云图进行一定时间段的预测有助于及时掌握云层的移动轨迹和变化情况,提高卫星云图资料的实用性.然而,当前卫星云图的预测面临诸多困难,例如,云团的变化大多是非平稳、非线性的;云图数据量小,实时性差等.因此,从时空序列的角度出发,提出一种基于3D卷积和自注意力机制的卫星云图预测模型,该模型在ST-LSTM(Spatiotemporal Long ShortTerm Memory)的基础上,在其单元内部引入3D卷积和自注意力机制,使模型能同时提取时间信息和空间特征,进一步增强云层短期趋势和长期依赖的联系;同时,在其外部框架使用空间和通道注意力机制,促进对云图空间特征的提取.在风云四号的卫星云图上进行评估,实验结果证明,该模型能够较准确地预测云层的形态变化和运动轨迹,各项评价指标均优于现有模型.展开更多
After nearly 50 years of development, Fengyun(FY) satellite ushered in its best moment. China has become one of the three countries or units in the world(China, USA, and EU) that maintain both polar orbit and geostati...After nearly 50 years of development, Fengyun(FY) satellite ushered in its best moment. China has become one of the three countries or units in the world(China, USA, and EU) that maintain both polar orbit and geostationary orbit satellites operationally. Up to now, there are 17 Fengyun(FY) satellites that have been launched successfully since 1988. There are two FY polar orbital satellites and four FY geostationary orbit satellites operate in the space to provide a huge amount of the earth observation data to the user communities. The FY satellite data has been applied not only in the meteorological but also in agriculture,hydraulic engineering, environmental, education, scientific research and other fields. More recently, three meteorological satellites have been launched within the past two years. They are FY-4 A on 11 December2016, FY-3 D on 15 November 2017 and FY-2 H on 5 June 2018. This paper introduces the current status of FY meteorological satellites and data service. The updates of the latest three satellites have been addressed.The characteristics of their payloads on-boarding have been specified in details and the benefit fields have been anticipated separately.展开更多
文摘卫星云图是气象预报的重要资源之一,可以显示云层的生消变化,对气象分析和预报工作有极大的作用.对云图进行一定时间段的预测有助于及时掌握云层的移动轨迹和变化情况,提高卫星云图资料的实用性.然而,当前卫星云图的预测面临诸多困难,例如,云团的变化大多是非平稳、非线性的;云图数据量小,实时性差等.因此,从时空序列的角度出发,提出一种基于3D卷积和自注意力机制的卫星云图预测模型,该模型在ST-LSTM(Spatiotemporal Long ShortTerm Memory)的基础上,在其单元内部引入3D卷积和自注意力机制,使模型能同时提取时间信息和空间特征,进一步增强云层短期趋势和长期依赖的联系;同时,在其外部框架使用空间和通道注意力机制,促进对云图空间特征的提取.在风云四号的卫星云图上进行评估,实验结果证明,该模型能够较准确地预测云层的形态变化和运动轨迹,各项评价指标均优于现有模型.
基金Supported by the National Key Research＆Development Program of China(2018YFB0504900,2018YFB0504901,2018YFB0504905)
文摘After nearly 50 years of development, Fengyun(FY) satellite ushered in its best moment. China has become one of the three countries or units in the world(China, USA, and EU) that maintain both polar orbit and geostationary orbit satellites operationally. Up to now, there are 17 Fengyun(FY) satellites that have been launched successfully since 1988. There are two FY polar orbital satellites and four FY geostationary orbit satellites operate in the space to provide a huge amount of the earth observation data to the user communities. The FY satellite data has been applied not only in the meteorological but also in agriculture,hydraulic engineering, environmental, education, scientific research and other fields. More recently, three meteorological satellites have been launched within the past two years. They are FY-4 A on 11 December2016, FY-3 D on 15 November 2017 and FY-2 H on 5 June 2018. This paper introduces the current status of FY meteorological satellites and data service. The updates of the latest three satellites have been addressed.The characteristics of their payloads on-boarding have been specified in details and the benefit fields have been anticipated separately.
