Abstract
Abstract. Today the use of spaceborne Very High Spatial Resolution (VHSR) optical sensors for automatic 3D information extraction is increasing in the scientific and civil communities. The 3D Optical Metrology (3DOM) Unit of the Bruno Kessler Foundation (FBK) in Trento (Italy) has collected stereo VHSR satellite imagery, as well as aerial and terrestrial data over Trento, with the aim to create a complete data collection with state-of-the-art datasets for investigations on image analysis, automatic digital surface model (DSM) generation, 2D/3D feature extraction, city modelling and data fusion. The testfield region covers the city of Trento, characterised by very dense urban (historical centre), residential and industrial areas, and the surrounding hills and steep mountains (approximate height range 200-2100 m) with cultivations, forests and bare soil. This paper reports the analysis conducted in FBK on the VHSR spaceborne imagery of Trento testfield for 3D information extraction. The data include two stereo-pairs acquired by WorldView-2 in August 2010 and by GeoEye-1 in September 2011 in panchromatic and multispectral mode, together with their original Rational Polynomial Coefficients (RPC), and the position and description of well distributed ground points. For reference and validation, a DSM from airborne LiDAR acquisition is used. The paper gives details on the project and the dataset characteristics. The results achieved by 3DOM on DSM extraction from WorldView-2 and GeoEye-1 stereo-pairs are shown and commented.
Highlights
The 3D Optical Metrology (3DOM) unit of the Bruno Kessler Foundation (FBK) in Trento (Italy) is building a testfield by collecting high resolution (HR) and very high resolution (VHR) satellite imagery, airborne and UAV images and orthophotos, LiDAR scans, and a network of circa 70 ground control points
This paper focuses on the processing of the very high resolution (VHR) satellite imagery available in the testfield for digital surface model (DSM) extraction
This paper presented the testfield set up in Trento by the 3D Optical Metrology (3DOM) Unit of Bruno Kessler Foundation (FBK) of Trento, Italy, with the aim to investigate optical imagery, perform automatic digital surface modelling, 2D/3D feature extraction and data fusion using state-of-the-art spaceborne, aerial and terrestrial data
Summary
The 3D Optical Metrology (3DOM) unit of the Bruno Kessler Foundation (FBK) in Trento (Italy) is building a testfield by collecting high resolution (HR) and very high resolution (VHR) satellite imagery, airborne and UAV images and orthophotos, LiDAR scans, and a network of circa 70 ground control points. This paper focuses on the processing of the very high resolution (VHR) satellite imagery available in the testfield for digital surface model (DSM) extraction. Spaceborne VHR optical sensors are able to scan any point of the Earth surface with a ground spatial resolution around half meter and a revisit time in the order of few days; through their very agile manoeuvring they can acquire stereo data within the same orbit just using the CCD line combination, by pointing at the same area from two or more orbit positions (Poli and Toutin, 2012). The images were oriented using the available ground control points and digital surface models were generated with area- and feature-based least-square image matching.
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