Session Abstract3D Visualization of Orthorectified Radar Imagery and Digital Elevation Models Used to Extract Geological Structure in Amurang, Sulewasi, Indonesia The legacy of geology maps of Sulewasi, Indonesia was originated in the early days of Dutch occupation in the country. Despite the mapping in these days was undertaken manually, using available optical measurement instruments through ground survey work, producing geological maps at a 1:250,000 scale. The Geological Research and Development Centre, Bandung, Indonesia has purchased high resolution airborne orthorectified radar images (ORI) and digital elevation models (DEMs) from Intermap Technologies as part of a national mapping program to generate 1:50,000 scale geologcail maps for Sulawesi. IFSAR uses two side-looking apertures (antennae) onboard a platform, separated by a baseline. During each flight pass, the system collects phase, amphlitude, global positioning system (GPS) data and inertial measurement data (IMU). The GPS and IMU data are differentially processed after the flight to determine the precise position of the two antennae baseline relative to the ground. This information is then used to precisely align the two IFSAR data images (one from each antennae) so that the phase differences may be calculated and used to infer topographic height of the area being imaged. This system automatically generates a DEM and an ORI. Additionally, semi-automated post-editing of the IFSAR data is required to generate the ORI and DEM products ready for use to generate 1:50,000 scale geological maps. The ORI and DEM are used in conjuction with existing 1:250,000 scale geological map and Landsat imagery are used to generate 1:50,000 scale geological maps for the entire island of Sulawesi. This workshop will provide an insight into the method used to create these geological maps. The workshop will focus on one 15" by 15" map sheet located in Amurang, Sulawesi, Indonesia. The method utilizes the ORI and DEM to create three dimensional visualization of the terrain in Amurang. This type of visualization enables the Geologist to easily interpret and extract geological structure, lithological units, drainage networks, transportation routes and urban areas. All feature are compiled based on geological mapping specifications set forth by the Geological Research and Development Centre and topographic mapping standards set forth by the Unites States Geological Society. The DEM is utilized to provide contour information of the region. This process provides complete and accurate three dimensional vector, point and polyine digital data files. Speaker BiographyM. Lorraine Tighe Mrs. Tighe graduated from Acadia University in 1988 with a degree in Physics and Geology; in 1990 with a masters in Oceanography; and in 1991 with a Diploma in Remote Sesning and GIS. She is currently erolled in the PhD program at Ottawa-Carleton Geoscience Centre. Mrs. Tighe entered the world of radar remote sensing in 1991 when she started a consultant company to build a geological database of remotely sensed data for the province of Nova Scotia, Canada. She joined Intera/Intermap Technologies in 1993, on contract to the Canada Centre for Remote Sensing where she participated in radar applications research in the preparation for the launch of RADARSAT I. In 1996, she accepted the position of Radar Applications Specialist at Intermap where she worked and lived extensively in SE Asia. Since 1999 she has been the Senior Radar Specialist and Trainer for Intermap - educating end users on IFSAR technology for a variety of applications. She travels extensively to SE Asia, South and Central America, and Europe.
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