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Image-based 3D modeling of the Erechteion, Acropolis of Athens
(2008)International Archives of the Photogrammetry, Remote Sensing and Spatial Information SciencesIn this contribution, we report on the image-based modeling (IBM) results of the Erechtheion monument, located inside the Acropolis of Athens, Greece. The work is part of the project “Development of Geographic Information Systems at the Acropolis of Athens“. An aim of the project is the 3D documentation of the whole Acropolis, one of the major archaeological sites world-wideincluded in the UNESCO ...Conference Paper -
Extraction of Buildings using Images & Lidar Data and a Combination of Various Methods
(2009)International Archives of the Photogrammetry, Remote Sensing and Spatial Information SciencesIn this work, we focus on the detection of buildings, by combining information from aerial images and Lidar data. We applied four different methods on a dataset located at Zurich Airport, Switzerland. The first method is based on DSM/DTM comparison in combination with NDVI analysis (Method 1). The second one is a supervised multispectral classification refined with a normalized DSM (Method 2). The third approach uses ...Conference Paper -
Geometric validation of CARTOSAT -1 Imagery
(2008)International Archives of the Photogrammetry, Remote Sensing and Spatial Information SciencesThe Institute of Geodesy and Photogrammetry (IGP) is participating in the Cartosat-1 evaluation program, a common initiative ofISRO (India) and ISPRS. Within this program, various test sites with reference data have been established and Cartosat-1 imageshave been acquired over these sites. We have reported already about the Rome and Mausanne datasets in a former publication. Here, we report about our ...Conference Paper -
Improving Cartographic Road Databases by Image Analysis
(2002)International Archives of the Photogrammetry, Remote Sensing and Spatial Information SciencesThe extraction of road networks from aerial images is one of the current challenges in digital photogrammetry and computer vision.In this paper, we present our system for 3D road network reconstruction from aerial images using knowledge-based image analysis.In contrast to other approaches, the developed system integrates processing of color image data and information from digital spatialdatabases, extracts and fuses multiple object ...Conference Paper -
Change Detection in Mire Ecosystems
(2007)International Archives of the Photogrammetry, Remote Sensing and Spatial Information SciencesThe objective of this paper is to present an approach for assessing tree growth and shrub encroachment between 1997 and 2002 inopen mire land using CIR-aerial images, DSMs and LiDAR data. The study area is located in the Pre-alpine zone of Central Switzerland. The present study was carried out in the framework of the Swiss Mire Protection Program, where changes of forest area are a key issue. Automatic DSMs were ...Conference Paper -
Object Extraction at Airport Sites Using DTMs/DSMs and Multipectral Image Analysis
(2007)International Archives of the Photogrammetry, Remote Sensing and Spatial Information SciencesThe automatic detection and 3D modeling of objects at airports is an important issue for the EU FP6 project PEGASE. PEGASE is a feasibility study of a new 24/7 navigation system, which could either replace or complement existing systems and would allow a three dimensional truly autonomous aircraft landing and take-off primarily for airplanes and secondary for helicopters. This new navigation system relies on three key ...Conference Paper -
In-depth investigations of parameters influencing the accuracy of orthoimages from high resolution satellites
(2006)International Archives of the Photogrammetry, Remote Sensing and Spatial Information SciencesOrthoimages are the most popular product from high spatial resolution satellite sensors. Various investigations, especially regarding Ikonos and Quickbird, have been published and achieved accuracies reported. However, these investigations are based on different input parameters (density and accuracy of DTM, number, distribution and accuracy of GCPs, sensor model, range of heights in the ...Conference Paper -
Recording, Modeling, Visualisation and GIS Applications Development for the Acropolis of Athens
(2008)International Archives of the Photogrammetry, Remote Sensing and Spatial Information SciencesThis paper presents the project “Development of Geographic Information Systems at the Acropolis of Athens“, financed by the European Union and the Government of Greece. The Acropolis of Athens is one of the major archaeological sites world-wide included in the UNESCO World Heritage list. The project started in June 2007 and will finish at the end of 2008. The paper presents the motivation for the ...Conference Paper -
Performance evaluation of ATOMI system for road database updating from aerial film, ADS40, Ikonos and Quickbird orthoimagery
(2005)International Archives of the Photogrammetry, Remote Sensing and Spatial Information SciencesAutomated road extraction from images has drawn considerable attention for decades due to the need for the efficient acquisition and updating of road data for geodatabases. The development of new digital aerial sensors and high-resolution satellite sensors signifies a revolutionary change in image acquisition and the possibility of fully digital processing from image acquisition to the generation of value-added products for various ...Conference Paper -
Potential and Limits of Airborne Remote Sensing Data for Extraction of Fractional Canopy Cover and Forest Stands and Detection of Tree Species
(2008)International Archives of the Photogrammetry, Remote Sensing and Spatial Information SciencesThis study presents a methodology for derivation of fractional canopy cover, detection of main tree species, and extraction of forest stands using logistic regression, airborne remote sensing data and field samples. In a first step, canopy height models (CHMs) are generated using medium point density LiDAR DSM and DTM and a high-quality matching DSM. Then, fractional canopy covers are calculated using ...Conference Paper