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：2009
卷号：XXXVIII-3/W8
页码：55-60
出版社：Copernicus Publications
摘要：Since the mid-1990s, the Institute of Photogrammetry and Remote Sensing (I.P.F.) is engaged in Airborne Laser Scanning (ALS) in research and development. Scientific contributions have been made in a wide field of related topics like full waveform signal analysis, georeferencing and filtering of ALS point clouds, automatic breakline modelling, DTM generation, quality control, etc. Apart from that, converting research ideas into software solutions is an enduring tradition at the I.P.F. for which the DTM program SCOP++ is an example. Partial solutions of ALS-related issues have been implemented in SCOP++, but a complete processing chain is missing, as the development cycles for this highly interactive program are long. Thus, the objectives of the new OPALS program system are to provide a complete processing chain for large ALS projects and to shorten development cycles significantly. OPALS is designed as a collection of small well-defined modules which can be accessed in three different ways: (i) from DOS/Unix shells as executables, (ii) from Python shells as full-featured, platform-independent Python modules or (iii) from custom C++ programs by dynamic linkage (DLL) for fastest module calls. Sophisticated custom processing chains can be established by freely combining the OPALS modules using shell or Python scripts. To reduce development times, a lightweight framework is introduced. It allows non-expert programmers to implement their own modules, concentrating on the implementation of their latest research outcomes, whereas the framework deals with general issues like validation of user inputs, error handling, logging, etc. In this way, new research outcomes get available more rapidly for the scientific community. OPALS does not only target researchers, but also ALS service providers dealing with large ALS projects. Efficient data handling is a precondition for this purpose. Thus, the OPALS data manager (ODM) is one of the core units, allowing administration of data volumes in the order of 10 9 points. The ODM acts as spatial cache and provides high-performance spatial queries. Currently, a quality control package (opalsQC) is in progress and first results (point density maps, strip difference maps, 3D-strip shifts) are presented in the paper
关键词：LIDAR; ALS processing software; automatic work.ow; data administration
