Cosmo-skymed very short repeat-pass SAR interferometry over rural areas: The VAL D'agri and potenza test cases in Basilicata, Italy

2015 ◽  
Author(s):  
Pietro Milillo ◽  
Daniele Perissin ◽  
Paul Lundgren ◽  
Carmine Serio
Keyword(s):  
Rural Areas ◽  
Sar Interferometry ◽  
Test Cases ◽  
Short Repeat

scholarly journals Analysis of deformation patterns through advanced DINSAR techniques in Istanbul megacity

2014 ◽  
Vol XL-7 ◽  
pp. 19-21
Author(s):  
F. Balik Sanli ◽  
F. Calò ◽  
S. Abdikan ◽  
A. Pepe ◽  
T. Gorum
Keyword(s):  
Rural Areas ◽  
Ground Deformation ◽  
Mitigation Strategies ◽  
Sar Interferometry ◽  
Economic Losses ◽  
Hazard And Risk ◽  
Small Baseline ◽  
Urbanization Rate ◽  
Deformation Patterns ◽  
Urban Planning And Management

As result of the Turkey’s economic growth and heavy migration processes from rural areas, Istanbul has experienced a high urbanization rate, with severe impacts on the environment in terms of natural resources pressure, land-cover changes and uncontrolled sprawl. As a consequence, the city became extremely vulnerable to natural and man-made hazards, inducing ground deformation phenomena that threaten buildings and infrastructures and often cause significant socio-economic losses. Therefore, the detection and monitoring of such deformation patterns is of primary importance for hazard and risk assessment as well as for the design and implementation of effective mitigation strategies. Aim of this work is to analyze the spatial distribution and temporal evolution of deformations affecting the Istanbul metropolitan area, by exploiting advanced Differential SAR Interferometry (DInSAR) techniques. In particular, we apply the Small BAseline Subset (SBAS) approach to a dataset of 43 TerraSAR-X images acquired, between November 2010 and June 2012, along descending orbits with an 11-day revisit time and a 3 m × 3 m spatial resolution. The SBAS processing allowed us to remotely detect and monitor subsidence patterns over all the urban area as well as to provide detailed information at the scale of the single building. Such SBAS measurements, effectively integrated with ground-based monitoring data and thematic maps, allows to explore the relationship between the detected deformation phenomena and urbanization, contributing to improve the urban planning and management.

Active landslides deformations mapping and monitoring in rural areas using satellite radar interferometry

2021 ◽  
Author(s):  
Nicușor Necula ◽  
Mihai Niculita
Keyword(s):  
Rural Communities ◽  
Rural Areas ◽  
Urban Areas ◽  
Sar Interferometry ◽  
Rural Settlements ◽  
Large Area ◽  
Active Landslide ◽  
Satellite Radar ◽  
Urban And Rural Areas ◽  
Differential Sar Interferometry

<p>Landslide hazards pose as one of the greatest risks in today’s context of climate change and settlement expansion. The later process occurs both in the urban and rural areas and significantly changes the terrain morphology and contributes as a conditioning factor for the triggering of new landslide events or reactivation of old dormant ones. Usually, the urban areas are of a greater interest to assess the activity of landslides and their associated risks. On the other hand, the remote areas such as the rural settlements are not as much investigated and monitored, mostly because the in-situ investigations requires additional costs for the deployment of various instruments.</p><p>In the last decades, the development of Advanced Differential SAR Interferometry techniques permits to identify and monitor these geomorphological processes from space. They rely on the microwave’s signal properties to quantify with millimeter accuracy possible deformations in time. The advances of satellite’s acquisition capabilities and the increase of computational power allow the mapping of active landslides over wide areas and even detection of failure precursors.</p><p>In our case, we used the DInSAR techniques to identify the active landslides over a large area in the Moldavian Plateau that affects the human settlements. Even though for the urban areas was much easier to detect the landslide induced deformations, in the case of the rural communities this task was much more challenging. We used the COMET-LiCS Sentinel-1 InSAR data (LiCSAR) and the LiCSBAS software for processing the data for the Moldavian Plateau, Northeastern Romania. Based on the results post-processing we classified the landslides activity based on their velocity and we created an active landslide inventory of the area.</p>

scholarly journals Multi-temporal landslide activity investigation by spaceborne SAR interferometry: Polish Carpathians case study

2020 ◽  
Author(s):  
Kamila Pawluszek-Filipiak ◽  
Mahdi Motagh ◽  
Andrzej Borkowski
Keyword(s):  
Rural Areas ◽  
Land Development ◽  
Sar Interferometry ◽  
Rural Setting ◽  
Persistent Scatterer Interferometry ◽  
Alos Palsar ◽  
Landslide Activity ◽  
Persistent Scatterer ◽  
Multi Temporal ◽  
Activity State

Abstract. The main goal of this research is the activity state verification of existing landslide inventory maps using Persistent Scatterer Interferometry (PSI). The study was conducted in Małopolskie municipality, a rural setting with a sparse urbanization in Polish Flysch Carpathians. PSI have been applied using Synthetic Aperture Radar (SAR) data from ALOS PALSAR, and Sentinel 1A/B from different acquisition geometry (ascending and descending orbit) to increase PS coverage and overcome geometric effects due to layover and shadowing. The Line-Of-Sight PSI measurements were projected to the steepest slope, which allows to homogenize the results from diverse acquisition modes and to compare displacement velocities with different slope orientations. Additionally, landslide intensity (motion rate) and expected damages maps were generated and verified during filed investigations. High correlation between PSI results and in-situ damage observations has been confirmed. Activity state and landslide-related expected damage map have been confirmed for 43 out of a total of 50 landslides investigated in the field. The short temporal baseline provided by Sentinel satellite 1A/B data allows increasing of the PS density significantly. The study substantiates usefulness of SAR based landslide activity monitoring for land use and land development, even in rural areas.

Recent Subsidence Rates in the Mekong Delta derived from Sentinel-1 SAR-Interferometry

2020 ◽  
Author(s):  
Nils Dörr ◽  
Andreas Schenk ◽  
Kim de Wit ◽  
Bente R. Lexmond ◽  
Philip S.J. Minderhoud ◽  
...  
Keyword(s):  
Spatial Distribution ◽  
Sea Level ◽  
Land Subsidence ◽  
Rural Areas ◽  
Ground Surface ◽  
Mekong Delta ◽  
Sar Interferometry ◽  
Persistent Scatterer Interferometry ◽  
Lithostratigraphic Units ◽  
Flooding Risk

<p>Coastal subsidence increases the vulnerability to flooding risk, salinization of water resources and permanent inundation. For the Mekong Delta, whose mean elevation is less than 2 m above sea level, subsidence rates of up to several centimeters per year have been reported recently. This leads to a growing risk for the resident population, infrastructure and economy, increased by the accelerating sea level rise. Land subsidence in Mekong Delta has different causes, most prominently natural compaction of young deltaic sediments, but also overexploitation of groundwater aquifers with accompanying head decline. Precise monitoring of the subsidence rate is necessary for analyses of cause and hazard as well as planning and assessment of countermeasures. Here, we present and discuss recent land subsidence rates in the Mekong Delta derived from satellite-based SAR-Interferometry.</p><p>We use Sentinel-1 scenes acquired between 2015 and 2019 to analyze recent land subsidence in the lower Mekong Delta. The Persistent Scatterer Interferometry technique (PS-InSAR) is applied, which allows for the estimation of displacement rates of coherent backscatter targets with mm-accuracy. Separate analyses of time series from ascending and descending observations and comparison with other studies based on data of the same sensor give insight into the accuracy of the parameter estimation and the error budget.</p><p>The observed subsidence rates of up to 6 cm/yr feature mainly three different spatial characteristics: (i) interconnected areas of little to no subsidence, (ii) isolated urban hot-spots with high subsidence rates and (iii) larger regions with increased subsidence rates covering urban as well as rural areas. Points on deeply founded infrastructure frequently exhibit lower subsidence rates than adjacent ground surface points. We study this phenomenon at different buildings since subsidence rates with respect to different foundation depths can be used as a proxy to constrain the effective depths of sediment compaction. Further, the correlation of observed subsidence rates and spatial distribution of lithostratigraphic units from quaternary sedimentary depositions is investigated. Finally, we show changes and commons in the spatial distribution of the subsidence rates compared to a previously published study on subsidence in the Mekong Delta covering data from 2006 to 2010.</p>

Linear Visco-Resistive Computations of Magnetohydrodynamic Waves: I. The Code and Test Cases

1994 ◽  
Vol 144 ◽  
pp. 503-505
Author(s):  
R. Erdélyi ◽  
M. Goossens ◽  
S. Poedts
Keyword(s):  
Resonant Absorption ◽  
Numerical Code ◽  
Mhd Waves ◽  
Test Cases ◽  
Numerical Accuracy ◽  
Element Discretization ◽  
Flux Tubes ◽  
Magnetohydrodynamic Waves ◽  
Viscosity Coefficients ◽  
Magnetic Flux Tubes

AbstractThe stationary state of resonant absorption of linear, MHD waves in cylindrical magnetic flux tubes is studied in viscous, compressible MHD with a numerical code using finite element discretization. The full viscosity tensor with the five viscosity coefficients as given by Braginskii is included in the analysis. Our computations reproduce the absorption rates obtained by Lou in scalar viscous MHD and Goossens and Poedts in resistive MHD, which guarantee the numerical accuracy of the tensorial viscous MHD code.

Training Aides to Screen Children for Speech and Language Problems

1976 ◽  
Vol 7 (4) ◽  
pp. 236-241 ◽  
Author(s):  
Marisue Pickering ◽  
William R. Dopheide
Keyword(s):  
Rural Areas ◽  
Large Scale ◽  
School Personnel ◽  
School Age Children ◽  
Speech And Language ◽  
Elementary School Age ◽  
Evaluation Procedures ◽  
Language Problems ◽  
Competency Based ◽  
Large Scale Screening

This report deals with an effort to begin the process of effectively identifying children in rural areas with speech and language problems using existing school personnel. A two-day competency-based workshop for the purpose of training aides to conduct a large-scale screening of speech and language problems in elementary-school-age children is described. Training strategies, implementation, and evaluation procedures are discussed.

International Telesupervision: The Clinical Fellowship Experience

2017 ◽  
Vol 2 (11) ◽  
pp. 73-78
Author(s):  
David W. Rule ◽  
Lisa N. Kelchner
Keyword(s):  
Graduate Students ◽  
Clinical Supervision ◽  
Rural Areas ◽  
The United States ◽  
Speech Language Pathology ◽  
Access To Services ◽  
East African ◽  
The World ◽  
Language Pathology ◽  
National Certification

Telepractice technology allows greater access to speech-language pathology services around the world. These technologies extend beyond evaluation and treatment and are shown to be used effectively in clinical supervision including graduate students and clinical fellows. In fact, a clinical fellow from the United States completed the entire supervised clinical fellowship (CF) year internationally at a rural East African hospital, meeting all requirements for state and national certification by employing telesupervision technology. Thus, telesupervision has the potential to be successfully implemented to address a range of needs including supervisory shortages, health disparities worldwide, and access to services in rural areas where speech-language pathology services are not readily available. The telesupervision experience, potential advantages, implications, and possible limitations are discussed. A brief guide for clinical fellows pursuing telesupervision is also provided.

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