协同策略下的卫星数字正射影像图制作

A digital orthophoto generation mode based on collaborative strategy

高分辨率对地观测卫星快速发展,卫星影像已经成为人类获取地球空间信息的重要数据源,卫星数字正射影像图是对卫星影像进行一系列处理后生成的数字测绘产品,具有影像直观、信息量丰富、细节表达清楚、像点坐标可量测等特点,在国民经济和军事等各个领域都有广泛的应用价值。本文针对海量卫星数字正射影像图的制作需求,首先,分析了地球成像加速器、集群图像处理系统、特征控制引擎的技术特性及三者协同处理基础;然后,提出了一种跨平台协同策略下的高效全流程卫星数字正射影像图制作方法,该方法以卫星原始影像、数字高程模型、参考影像为输入,通过地球成像加速器、集群图像处理系统、特征控制引擎的协同处理,快速完成几何纠正、匀色处理、镶嵌裁切等主要流程后生成数字正射影像图;最后,利用WorldView-Ⅱ高分辨率多光谱卫星影像和全色卫星影像进行试验。结果表明,该方法可高效制作符合精度要求的卫星数字正射影像图产品。

With the rapid development of high-revsolution earth observation satellites,satellite image has become an important data source for humans to obtain geospatial information.As a digital mapping product generated after a series of processing of satellite image,satellite digital orlhophoto map features intuitive image,rich information,clear expression of details and measurable image point coordinates,which has a wide range of application.In order to meet the needs of massive satellite digital orthophoto map production,the technical characteristics of the earth imaging accelerator,the cluster image processing system and the feature control engine are analyzed at first.Then an efficient whole process production method based on the cross platform collaborative strategy is proposed.Taking the original satellite image,digital elevation model and reference image as the input,the earth imaging accelerator,the cluster image processing system and the feature control engine are collaborated to conduct image processing,and the digital orthophoto map is generated after geometry rectification,color balancing,image mosaicking,etc.Finally,the Worldview Ⅱ high-resolution multispectral and panchromatic images are used to carry out the test,and the results show that the method can he employed to produce digital orthophoto map products with high resolution.