Sustaining Infrastructure Project Summary Survey Department of Sri Lanka Jaffna, Northern Province, Sri Lanka Project Objectives • Integrate spatial data collection • Produce 1:10000 scale digital topographic maps • Create a geospatial model of the City of Jaffna from stereo pairs of aerial photographs Products Used Bentley Map®, MicroStation® CASE STUDY Sri Lanka Survey Department Deploys Bentley Map for Digital Topographie Mapping upport Development in the Northern rrovmce Fast Facts • Bentley Map was used to build the large-scale digital terrain model for ability to produce topological vector • Bentley software enabled digita mapping data extraction and topol- • MicroStation's advanced rendering Improved the model's functionality • Bentley products enhanced project team workflows, improved data quality, and increased the number of data layers • DTMs will contribute to improved safety in developing areas, where urgent issues can be addressed based on quality data have been completed without Bentley software Improved Data Quality and Functionality The Survey Department of Sri Lanka is a national surveying and mapping organization charged with providing high- quality land information products and services. Led by the Surveyor General, the department has more than 5,000 technically qualified and dedicated personnel in surveying, mapping, and allied fields. As part of a very large digital terrain model (DTM) project, the Survey Department used Bentley Map and MicroStation to deliver improved data quality and functionality for the City of Jaffna GIS. The Northern Province of Sri Lanka faces urgent issues such as repatriating internally displaced persons, rebuilding infrastructure, renovating irrigation facilities, reconstructing fisheries, and planning new development. Jaffna itself cov- ers an area of 20.2 square kilometers and has a population of nearly 84,500. The maps provide up-to-date and accurate information to aid planners in making decisions about how to address critical issues during development in the Northern Province. Initiated in February 2010, the mapping project included production of 1:10000 scale DTMs and orthophotos, and GIS maps for the Northern Province. The project team was undeterred by the inability to take new aerial photographs or perform additional ground surveys due to terrorist activ- Advances in digital photogrammetry have bridged the gap between GIS data collection and conventional photogram- metry, making it possible to obtain accurate 3D information from existing aerial photography. Work began with the creation of stereo pairs of 1:20000 aerial photographs and signalized ground control points using Intergraph's ERDAS LPS and the ORIMA add-on for aerial triangulation. DTMs were generated automatically, and orthophotos were created from the aerial triangulated block, digital terrain model, and stereo pairs. MicroStation provided the ability to produce topological vector layers in conjunction with ERDAS PRO600. GIS model shown in Bentley Map.

"Bentley geospatial editing digital topology clean-up. " - Pitiyage Shammie Prabhath Photogrammetric Technician Survey Department Find out about Bentley Contact Bentley Global Office Listings Sustaining Infrastructure Bentley Map was used for editing and exporting the data to shapefiles. These tools also enabled the Survey Depart- ment to build the database with elevations. The digital ter- rain models, orthophotos, and vector layers were added to the geospatial information in ERDAS IMAGINE VirtualGIS. Enhanced Workflows Enable Creation The challenges of this ambitious project were overcome,...