文章基本信息

标题：A New Procedure for The Automatic Production of True Orthophotos
本地全文：下载
作者：A. Biasion ; S. Dequal ; A. Lingua 等
期刊名称：ISPRS Annals of the Photogrammetry, Remote Sensing and Spatial Information Sciences
印刷版ISSN：2194-9042
电子版ISSN：2194-9050
出版年度：2004
卷号：XXXV Part B4
页码：538-543
出版社：Copernicus Publications
摘要：The digital orthophoto is a cheap and efficient product that is used to represent the correct shape of any 3D object, in photographic form, by means of its orthogonal projection onto a predefined plane. In mapping applications, if the zone to be represented contains urban areas, the problem becomes more complex because there are many discontinuity lines (breaklines) and hidden areas: this requires a more sophisticated orthoprojection procedure. The lack of information corresponding to the hidden areas is avoided if use is made of all the images ("multi-image" procedure) available in the photogrammetric block. More rigorous interpolation methods should be used to take into account the problem of discontinuities. Stereoplotting of the many break-lines (a difficult and expensive procedure) or, even, a DTM formed by a large amount of points (the so-called "dense DTM", or DDTM) gives the necessary data. For this purpose, the authors have recently conceived and implemented an original software composed of the following modules: . AccOrtho (=ACCurate ORTHOphoto), to produce rigorous digital orthophotos starting from multiple images and a DDTM; . GeneDDTM (GENEration of a DDTM), which is able to build a dense DTM (suitable for AccOrtho) from a 3D digital map, using sophisticated interpolation techniques. This paper describes the two software structures in detail and a practical application of both the programmes for a relevant mapping project, which is still in progress: a true orthophoto of the whole town of Turin, in 1:2.000 scale
关键词：Photogrammetry; Cartography; Digital Orthorectification; Urban Orthoimage; DEM/DTM; City; Automation