|
|
Austrian Agency Automates Sound Propagation Modeling
16 Mar, 2011 By: Todd TaylorUrban planners process volumes of optical, laser-scanning, and GIS data using INPHO and eCognition software.
The cost and time associated with manually assembling and processing detailed image data is significant. Integrating three-dimensional data, such as that generated by aerial laser scanning, vastly improves the value and accuracy of the information product produced; however, this data is practically impossible to manually prepare and analyze. Only by using software to automate data handling and analysis is it feasible for organizations to tackle land-use modeling and mapping projects for large areas. GEOinfo did exactly this when it adopted a process capable of automatically analyzing large volumes of data to deliver accurate and reproducible results in a standardized manner.
GEOinfo — the Department of Surveying and Geo Information of the State Government of Lower Austria — is the major provider of geographic data in the region. The department is structured into three areas: topographical survey, data collection, and data processing. GEOinfo's portfolio includes digital data and secondary products, such as maps and graphics, which are created on behalf of the state government.
Sound-wave propagation models for traffic noise have been generated over an area of more than 20,000 square kilometers in Austria using Trimble INPHO and eCognition software. The project detects and quantifies changes in forests, buildings, and water bodies using aerial laser scanning and orthophotos, and has been developed by the Government of Lower Austria as part of an urban planning initiative from the European Union. With measured accuracy ratings above 94%, the automated approach provides an information product that would be completely unviable and cost-prohibitive to create manually.
Handling Airborne Geospatial Data
In the GEOinfo project, automation of photogrammetric processes and digital terrain model (DTM) generation was essential due in part to the large data volume. Project personnel used INPHO, a photogrammetry and digital terrain modeling software suite, to manage and process GEOinfo's aerial laser scanning data over large areas.
The TopDM module was used to manage approximately 30,000 raw data flight strips, from which 20,000 DTM and 20,000 digital surface model (DSM) data tiles were derived. Various SCOP++ modules were applied to these data sets to perform tasks such as point cloud classification using filtering strategies, shade calculation, slope calculation, profile tools, and other terrain algebra methods. Available breaklines were used during these processes to increase the quality of the terrain modeling, especially in challenging topographic areas. The output of these processes provides input data for the next workflow step: the production of value-added products using eCognition.
1 2
|
|
AutoCAD Tips!
Autodesk Technical Evangelist Lynn Allen guides you through a different AutoCAD feature in every edition of her popular "Circles and Lines" tutorial series. For even more AutoCAD how-to, check out Lynn's quick tips in the Cadalyst Video Gallery. Subscribe to Cadalyst's Tips & Tricks Tuesdays free e-newsletter and we'll notify you every time a new video tip is available. All exclusively from Cadalyst! |
|
