scholarly journals INVESTIGATION OF THE GROUND MOTION NEAR THE LEANING TOWER OF BAD FRANKENHAUSEN USING SENTINEL-1 PERSISTENT SCATTERER INTERFEROMETRY

2020 ◽  
Vol XLIII-B3-2020 ◽  
pp. 305-312
Author(s):  
J. Jänichen ◽  
C. Dubois ◽  
M. Wolsza ◽  
N. Salepci ◽  
C. Schmullius
Keyword(s):  
Precise Determination ◽  
Persistent Scatterer Interferometry ◽  
Motion Models ◽  
The North ◽  
Persistent Scatterer ◽  
Data Resolution ◽  
Geophysical Processes ◽  
Displacement Pattern ◽  
Deformation Patterns ◽  
The Church

Abstract. Persistent Scatterer Interferometry (PSI) is a well-established technique for monitoring millimetre deformation of the Earth’s surface. The availability of free and open SAR data with a repeat cycle of 6–12 days from the Copernicus mission Sentinel-1, allows PSI to be used complementary to traditional surveying techniques. Whilst the data resolution may not allow a precise determination of the geolocation of the occurring deformation, observed deformation patterns can be analysed with auxiliary data and often show correlation with the location of geophysical processes or human activities. In this paper, we investigate the particular case of the church tower of Bad-Frankenhausen in the north of the Free State Thuringia, Germany, with PSI processing of Sentinel-1 data. Both pass directions (descending and ascending) are considered, and different motion models are tested in order to retrieve the most accurate displacement pattern around the church location. Deformation up to −6 mm/yr are observed near the church location for the period 2016–2019 in ascending direction.

scholarly journals Using PS-InSAR with Sentinel-1 Images for Deformation Monitoring in Northeast Algeria

Geosciences ◽  
2019 ◽  
Vol 9 (7) ◽  
pp. 315
Author(s):  
Omar Beladam ◽  
Timo Balz ◽  
Bahaa Mohamadi ◽  
Mahdjoub Abdalhak
Keyword(s):  
Ground Deformation ◽  
Regional Scale ◽  
Deformation Monitoring ◽  
Slope Instability ◽  
Radar Interferometry ◽  
Persistent Scatterer Interferometry ◽  
Accurate Identification ◽  
The North ◽  
Persistent Scatterer ◽  
Ground Deformation Monitoring

Constantine city, Algeria, and its surroundings have always been affected by natural and human-induced slope instability and subsidence. Neogene clay-conglomeratic formations, which form the largest part of Constantine city, are extremely sensitive to the presence of water, which makes them susceptible to landslides. Fast and accurate identification and monitoring of the main areas facing existing or potential hazardous risks at a regional scale, as well as measuring the amount of displacement is essential for the conservation and sustainable development of Constantine. In the last three decades, the application of radar interferometry techniques for the measurement of millimeter-level terrain motions has become one of the most powerful tools for ground deformation monitoring due to its large coverage and low costs. Persistent scatterer interferometry (PS-InSAR) has a demonstrated potential for monitoring a range of hazard event scenarios and tracking their spatiotemporal evolution. We demonstrate the efficiency of Sentinel-1 data for deformation monitoring in Constantine located in the northeast of Algeria, and how an array of information such as geological maps and ground-measurements are integrated for deformation mapping. We conclude this article with a discussion of the potential of advanced differential radar interferometry approaches and their applicability for structural and ground deformation monitoring, including the advantages and challenges of these approaches in the north of Algeria.

scholarly journals PSI Clustering for the Assessment of Underground Infrastructure Deterioration

2020 ◽  
Vol 12 (22) ◽  
pp. 3681
Author(s):  
Nicola Amoroso ◽  
Roberto Cilli ◽  
Loredana Bellantuono ◽  
Vincenzo Massimi ◽  
Alfonso Monaco ◽  
...  
Keyword(s):  
Remote Sensing ◽  
Clustering Algorithm ◽  
Detection System ◽  
Persistent Scatterer Interferometry ◽  
Critical Areas ◽  
Persistent Scatterer ◽  
Underground Infrastructure ◽  
Italian Provinces ◽  
Land Deformation ◽  
Deformation Patterns

Remote sensing images find application in several different domains, such as land cover or land usage observation, environmental monitoring, and urbanization. This latter field has recently witnessed an interesting development with the use of remote sensing for infrastructural monitoring. In this work, we present an analysis of Sentinel-1 images, which were used to monitor the Italian provinces of Bologna and Modena located at the Emilia Region Apennines foothill. The goal of this study was the development of a machine learning-based detection system to monitor the deterioration of public aqueduct infrastructures based on Persistent Scatterer Interferometry (PSI). We evaluated the land deformation over a temporal range of five years; these series feed a k-means clustering algorithm to separate the pixels of the region according to different deformation patterns. Furthermore, we defined the critical areas as those areas where different patterns collided or overlapped. The proposed approach provides an informative tool for the structural health monitoring of underground infrastructures.

scholarly journals Semi-Automatic Identification and Pre-Screening of Geological–Geotechnical Deformational Processes Using Persistent Scatterer Interferometry Datasets

2019 ◽  
Vol 11 (14) ◽  
pp. 1675 ◽  
Author(s):  
Tomás ◽  
Pagán ◽  
Navarro ◽  
Cano ◽  
Pastor ◽  
...  
Keyword(s):  
Regional Scale ◽  
Central Italy ◽  
Geographical Information ◽  
External Information ◽  
Automatic Identification ◽  
Persistent Scatterer Interferometry ◽  
Active Deformation ◽  
Persistent Scatterers ◽  
Persistent Scatterer ◽  
Map Scale

This work describes a new procedure aimed to semi-automatically identify clusters of active persistent scatterers and preliminarily associate them with different potential types of deformational processes over wide areas. This procedure consists of three main modules: (i) ADAfinder, aimed at the detection of Active Deformation Areas (ADA) using Persistent Scatterer Interferometry (PSI) data; (ii) LOS2HV, focused on the decomposition of Line Of Sight (LOS) displacements from ascending and descending PSI datasets into vertical and east-west components; iii) ADAclassifier, that semi-automatically categorizes each ADA into potential deformational processes using the outputs derived from (i) and (ii), as well as ancillary external information. The proposed procedure enables infrastructures management authorities to identify, classify, monitor and categorize the most critical deformations measured by PSI techniques in order to provide the capacity for implementing prevention and mitigation actions over wide areas against geological threats. Zeri, Campiglia Marittima–Suvereto and Abbadia San Salvatore (Tuscany, central Italy) are used as case studies for illustrating the developed methodology. Three PSI datasets derived from the Sentinel-1 constellation have been used, jointly with the geological map of Italy (scale 1:50,000), the updated Italian landslide and land subsidence maps (scale 1:25,000), a 25 m grid Digital Elevation Model, and a cadastral vector map (scale 1:5,000). The application to these cases of the proposed workflow demonstrates its capability to quickly process wide areas in very short times and a high compatibility with Geographical Information System (GIS) environments for data visualization and representation. The derived products are of key interest for infrastructures and land management as well as decision-making at a regional scale.

V. Mr. Pegge, on the Rudston Pyramidal Stone

Archaeologia ◽  
1779 ◽  
Vol 5 ◽  
pp. 95-97
Author(s):  
Pegge
Keyword(s):  
North East ◽  
The North ◽  
Great Height ◽  
History Of ◽  
The Town ◽  
The Church

Rudston, a village in the East-Riding of Yorkshire, on the Wolds, near Burlington, is thus noticed in bishop Gibson's edition of Camden, col. 901. “More inward into the “land, is Ruston, where, in the church-yard, is a kind of “pyramidal stone of great height. Whether the name of the “town may not have some relation to it, can be known only “from the private history of the place; but if the stone bear “any resemblance to a cross, rod in Saxon doth imply so much.” This cross, as the bishop calls it, and I think not improperly, is a very curious monument; and, no doubt, of very remote antiquity. I am not aware that it has ever been engraved, and therefore I here present the Society with an accurate drawing* of it, which I received A. 1769, from the friendly hand of Mr. Willan, whose account I shall take the liberty to subjoin. “This stone stands about four yards from the North East “corner of Rudston church, which is situated on a high hill. “Its depth under ground equal to its height above, as appeared “from an experiment made by the late Sir William Strickland. “All the four sides are a little convex, and the whole covered “with moss. No tradition in this country of any authorrity, either concerning the time, manner, or occasion of its “erection.”

Why Is There So Much Christianity in the United States? A Reply to Sommerville

2002 ◽  
Vol 71 (4) ◽  
pp. 858-864 ◽  
Author(s):  
David A. Hollinger
Keyword(s):  
United States ◽  
North Atlantic ◽  
Religious Affiliation ◽  
The United States ◽  
Church History ◽  
Voluntary Organizations ◽  
Secular Culture ◽  
The North ◽  
The Individual ◽  
The Church

If we are going to explain the slow pace of de-Christianization for the United States relative to other industrialized societies in the North Atlantic West, we might well begin with the church-state relationship. The absence of an established church in the United States has enabled religious affiliation to function, like other voluntary organizations in “civil society,” as mediators between the individual and the nation. I conimented on this rather old idea in a book C. John Sommerville is kind enough to cite in another connection, Science, Jews, and Secular Culture, but since he does not take up this point, I will develop it a bit further here, before reacting to Sommerville's other concerns as expressed in his refreshingly fair-minded rejoinder to my essay in the March 2001 issue of Church History.

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