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More and more cities are looking for service providers able to deliver 3D city models in a short time. Airborne laser scanning techniques make it possible to acquire a three-dimensional point cloud leading almost instantaneously to digital surface models (DSM), but these models are far from a topological 3D model needed by geographers or land surveyors. The aim of this paper is to present the pertinence...
Rapid urban growth and subsequent dramatic changes in landscape diversity have been witnessed in some developing countries as a result of rapid economic development. Since the 1960s, the Seoul Metropolitan Region (SMR) increasingly reflects a synthesis of urban and suburban building styles and land use patterns. This paper examines the measurement and monitoring of urban growth and change by the integration...
Kusadasi is one of the prominent touristic and agricultural areas of Turkey. Kusadasi has grown exponentially for over 45 years due to domestic immigration and tourism. As a result urban sprawl occurred in the form of summer houses and touristic establishments. The development not only impinges on agricultural areas, but also it pressures the nearby national park system. Dilek Peninsula-Big Meander...
Texture analysis is a long-standing and important problem in image-based urban characterization. A variety of approaches and methods have been proposed in the past to deal with urban texture segmentation and classification. However, texture characterization is particularly complex when the image data is composed of several spectral bands at different wavelengths, as in the case of remotely sensed...
Knowledge transfer for the classification of very high resolution panchromatic data over urban area is investigated. Invariant feature are extracted with some morphological processing. The well-known spectral angle mapper (SAM) is proposed as a measure of transferability. Support vector machines (SVMs) are used to fit a separating hyperplane in a vector space defined by the extracted spatial features...
High-resolution imagery presents a new challenge over other satellite systems in that a relatively large amount of data must be analyzed and corrected for registration and classification errors to identify the land cover changes related to urban development. To obtain the accuracies required by typical applications for wide areas, very extensive manual work is commonly required. In response, we have...
This paper presents a methodology for generating semi-automated 3D models of urban area from multiple high- resolution satellite images. Adoption of Rational Function Models (RFM's) during recent years as a replacement for satellite's rigorous sensor model by many commercial imagery providers makes 3D information extraction fast and reliable for most of end-users. This paper presents an application...
Urban areas are crowded environments, where a disaster can bring dramatic consequences, if not adequately forecasted and faced. Remote sensing instruments can be fruitfully used for both prediction and aid organization purposes. In particular, in this paper we present innovative synthetic aperture radar (SAR) techniques for the detection of a flooded area in urban settlements. A SAR raw signal simulator...
This paper introduces a new approach to compute similarity/dissimilarity between images or regions from images. It borrows concepts from object recognition and content based image retrieval. The main idea is to build a bag-of-features where the feature clusters are learnt from a single pair of images. Normalised cut is used to segment the image into regions which exhibit homogeneous and regular structural...
Due to the peculiar features of human settlement areas, with enormous variance of objects and the resulting variability and possibly also ambiguity of data, such areas represent the most demanding cases for information extraction from SAR data. This research is particularly aimed at human settlement mapping at a regional scale. Indeed, informal settlement monitoring is an important topic for the many...
In this paper, the polygonal active contour method is adapted to the case of synthetic aperture radar (SAR) images of urban areas. The statistical criterion is modified to be able to deal with multiple images in order to improve the segmentation of buildings. A criterion is proposed and is then implemented and tested over real high resolution SAR images containing urban areas. A discussion about the...
During the past years, Remote Sensing has become a powerful tool for earth observation. In particular, SAR differential interferometry (DInSAR) has shown to be a very reliable technique for deformation phenomena monitoring, being able to achieve millimetric accuracies. It is the aim of this paper to present and show the potentials of the UPC's advanced DInSAR algorithm, the coherent pixels technique...
Germany's capital Berlin has undergone tremendous urban structural changes in the past decades since the German re-unification. In addition to processes of urban growth and densification, processes of urban shrinkage occur in Berlin. As these processes have great impact on urban ecosystems and therefore on human well-being, monitoring of respective changes is required to support sustainable urban...
Multi-channel Interferometric SAR (InSAR) systems allow the estimation of the height profile of the Earth surface, exploiting the availability of multiple radar acquisitions, obtained via different baselines/frequencies. Maximum A Posteriori (MAP) statistical technique, and Markov random field image models, have shown to be effective for such estimation problem. However, real interferograms are affected...
Airborne laser swath mapping (ALSM) conducted by the Puget Sound LIDAR Consortium reveals uplift, folding, and faulting associated with earthquakes on the Seattle fault zone (SFZ) in Washington State, USA. The SFZ is a 5-to 7-km-wide, east-west trending zone of south-dipping thrust faults, north-dipping backthrust faults, and folds that runs through the Seattle urban area. Marine terraces along the...
Updated geographic information and 3D models of environments are becoming increasingly important for applications such as city planning, crisis management, visualisation, architecture, and landscaping. The task of producing detailed geospecific terrain databases or 3D city models has traditionally been manual and thus time-consuming, and the availability of appropriate source data has been limited...
Focus of the paper lies on automated texturing of 3d building models with images recorded with infrared (IR) cameras. Therefore, a data fusion of given 3d models provided by a GIS and recorded IR image sequences is performed. Two concepts are presented to project the 2d images into the 3d object space. In the first concept, the polygenes of the faces of the 3d model are projected into the IR image...
Modern airborne SAR sensor systems provide geometric resolution in the order well below half a meter. By SAR interferometry from pairs of such images DEM of the same grid size can be obtained. In data of this kind many features of urban objects become visible, which were beyond the scope of radar remote sensing only a few years ago. However, because of the side-looking SAR sensor principle, layover...
Urban form is one of the main characteristics of urban areas which affects its sustainability. It has a bearing on the size of the ecological footprint of the city, degree of soil sealing, transport (length of trips and modal split), air pollution, social segregation, etc. We analyse urban sprawl by making use of land use data gathered through remote sensing. Our data source is the multi-temporal...
The spatial queries in a geographical information system (GIS) uses the space attributes related to the geometry of the geographical objects. In these queries, research is done according to the location of the object in space. In order to efficiently process these queries, one needs specific access method. Among these methods one finds, the grid file, the R-trees, the quadtrees. In this paper, we...
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