基于WorldView-3卫星多视角数据的三维实景建模技术研究

Study on the 3D Modeling Technology Based on Multi-view WorldView-3 Satellite Data

目前亚米级立体卫星影像因其不受空域限制且重访周期短,已逐步成为航空摄影的有益补充,用于满足城市大比例尺地形图更新测绘的需要。而随着航空倾斜摄影测量技术在三维实景建模中的广泛应用,卫星影像平台的发展也让高分辨率卫星大倾角数据进入到我们的视野,研究基于高分辨率、多视角的立体卫星影像在三维实景建模应用的原理和方法具有实际意义。本文首次定制获取了三景不同倾角的WorldView-3卫星数据,其中两景是常规小倾角0.31 m多光谱立体影像一景是大于45°的0.5 m大倾角、多光谱卫星影像。本文对其三维实景建模的工艺和关键技术包括对基于卫星影像的纹理提取和自动映射技术、不同地物的采集方法进行了探讨,并提出星载高分立体多视角影像在三维建模方面的优劣势。

The stereo satellite submeter images with periodic revisit cycle,,not limited by the airspace,,has gradually become a useful supplement for aerial photography to meet the need of updating urban large-scale topographic map.With the wide application of aerial oblique photogrammetry technology in 3D modeling,,the development of satellite image platform makes it possible to supply high resolution spaceborne oblique data acquired with large pitch angle lens.It is of practical significance to study the principles and methods of 3D modeling based on high resolution and multi-view stereo satellite images.In this paper,,three sets of WorldView-3 satellite data with different viewing angles were specially ordered.There are a pair of conventional steep angle multispectral stereo images with pixel size of 0.31 m and one largeangle,,greater than 45 degrees,,multi spectral satellite image with resolution of 0.5 m.The process and technologies of 3D modeling with the testing data were discussed,,including texture extraction and automatic mapping work flow,,and the acquisition methods for different ground objects.The advantages and disadvantages of spaceborne high resolution stereo multi-view images in 3D modeling were concluded.