scholarly journals Seamless Synthetic Aperture Radar Archive for Interferometry Analysis

2014 ◽  
Vol XL-1 ◽  
pp. 65-72
Author(s):  
S. Baker ◽  
C. Baru ◽  
G. Bryson ◽  
B. Buechler ◽  
C. Crosby ◽  
...  
Keyword(s):  
Synthetic Aperture Radar ◽  
Access Point ◽  
Application Programming Interface ◽  
Synthetic Aperture ◽  
Srtm Dem ◽  
Data Products ◽  
Application Programming ◽  
Interferometric Sar ◽  
Programming Interface ◽  
Aperture Radar

The NASA Advancing Collaborative Connections for Earth System Science (ACCESS) seamless synthetic aperture radar (SAR) archive (SSARA) project is a collaboration between UNAVCO, the Alaska Satellite Facility (ASF), the Jet Propulsion Laboratory (JPL), and OpenTopography at the San Diego Supercomputer Center (SDSC) to design and implement a seamless distributed access system for SAR data and derived interferometric SAR (InSAR) data products. A unified application programming interface (API) has been created to search the SAR archives at ASF and UNAVCO, 30 and 90-m SRTM DEM data available through OpenTopography, and tropospheric data from the NASA OSCAR project at JPL. The federated query service provides users a single access point to search for SAR granules, InSAR pairs, and corresponding DEM and tropospheric data products from the four archives, as well as the ability to search and download pre-processed InSAR products from ASF and UNAVCO.

scholarly journals Editorial for the Special Issue “Urban Deformation Monitoring using Persistent Scatterer Interferometry and SAR Tomography”

2019 ◽  
Vol 11 (11) ◽  
pp. 1306
Author(s):  
Alessandra Budillon ◽  
Michele Crosetto ◽  
Oriol Monserrat
Keyword(s):  
Synthetic Aperture Radar ◽  
Urban Areas ◽  
Deformation Monitoring ◽  
Synthetic Aperture ◽  
Special Issue ◽  
Persistent Scatterer Interferometry ◽  
Persistent Scatterer ◽  
Wide Range ◽  
Interferometric Sar ◽  
Aperture Radar

This Special Issue hosts papers related to deformation monitoring in urban areas based on two main techniques: Persistent Scatterer Interferometry (PSI) and Synthetic Aperture Radar (SAR) Tomography (TomoSAR). Several contributions highlight the capabilities of Interferometric SAR (InSAR) and PSI techniques for urban deformation monitoring. In this Special Issue, a wide range of InSAR and PSI applications are addressed. Some contributions show the advantages of TomoSAR in un-mixing multiple scatterers for urban mapping and monitoring. This issue includes a contribution that compares PSI and TomoSAR and another one that uses polarimetric data for TomoSAR.

scholarly journals Multi-Temporal Small Baseline Interferometric SAR Algorithms: Error Budget and Theoretical Performance

2021 ◽  
Vol 13 (4) ◽  
pp. 557
Author(s):  
Antonio Pepe
Keyword(s):  
Synthetic Aperture Radar ◽  
Phase Unwrapping ◽  
Synthetic Aperture ◽  
Interferometric Synthetic Aperture Radar ◽  
Error Budget ◽  
Multi Temporal ◽  
Small Baseline ◽  
Time Inconsistent ◽  
Interferometric Sar ◽  
Aperture Radar

Multi-temporal interferometric synthetic aperture radar (MT-InSAR) techniques are well recognized as useful tools for detecting and monitoring Earth’s surface temporal changes. In this work, the fundamentals of error noise propagation and perturbation theories are applied to derive the ground displacement products’ theoretical error bounds of the small baseline (SB) differential interferometric synthetic aperture radar algorithms. A general formulation of the least-squares (LS) optimization problem, representing the SB methods implementation’s core, was adopted in this research study. A particular emphasis was placed on the effects of time-uncorrelated phase unwrapping mistakes and time-inconsistent phase disturbances in sets of SB interferograms, leading to artefacts in the attainable InSAR products. Moreover, this study created the theoretical basis for further developments aimed at quantifying the error budget of the time-uncorrelated phase unwrapping mistakes and studying time-inconsistent phase artefacts for the generation of InSAR data products. Some experiments, performed by considering a sequence of synthetic aperture radar (SAR) images collected by the ASAR sensor onboard the ENVISAT satellite, supported the developed theoretical framework.

scholarly journals Spatial and temporal subsidence characteristics in Wuhan (China), during 2015–2019, inferred from Sentinel-1 synthetic aperture radar (SAR) interferometry

2021 ◽  
Vol 21 (8) ◽  
pp. 2285-2297
Author(s):  
Xuguo Shi ◽  
Shaocheng Zhang ◽  
Mi Jiang ◽  
Yuanyuan Pei ◽  
Tengteng Qu ◽  
...  
Keyword(s):  
Synthetic Aperture Radar ◽  
Urban Expansion ◽  
Sar Interferometry ◽  
Synthetic Aperture ◽  
Ground Subsidence ◽  
Karst Collapse ◽  
Jianghan Plain ◽  
Soft Foundation ◽  
Interferometric Sar ◽  
Aperture Radar

Abstract. Ground subsidence is regarded as one of the most common geohazards, accompanied with the rapid urban expansion in recent years. In the last 2 decades, Wuhan, located in the alluvial Jianghan Plain, has experienced great urban expansion with increased subsidence issues, i.e., soft foundation subsidence and karst collapse. Here we investigated subsidence rates in Wuhan with 2015–2019 Sentinel-1 synthetic aperture radar (SAR) images. We found that the overall subsidence over the Wuhan region is significantly correlated with the distribution of engineering geological subregions (EGSs). We further validated the interferometric SAR (InSAR) measurements with better than 5 mm accuracy by comparing with leveling measurements. Subsidence centers in Qingling–Jiangdi, Houhu, Qingshan, and Dongxihu were identified with displacement rates of approximately 30 mm/yr. Our results demonstrated that the dominant driving factor is ongoing construction, and the fact that the subsidence centers shifted with construction intensities. The Qingling–Jiangdi area in our study is a well-known site of karst collapse. We find that the nonlinear subsidence of this area is correlated with the seasonal rainfall.

scholarly journals Nesnelerin interneti teknolojileri kullanılarak Wi-Fi MAC Adresi tabanlı insan toplulukları izleme ve analiz sistemi

2020 ◽  
Vol 3 (1) ◽  
pp. 642-649
Author(s):  
Turgay Tugay Bilgin ◽  
Recep Tayyib Aksakal
Keyword(s):  
Access Control ◽  
Ieee 802.11 ◽  
Access Point ◽  
Application Programming Interface ◽  
Media Access Control ◽  
Media Access ◽  
Application Programming ◽  
Programming Interface ◽  
Wireless Fidelity

Bu çalışmada, belirli bir konumdan geçen insan topluluklarının hareketlilik analizini yapmayı sağlayacak bir system geliştirilmiştir. Bu çalışmada, amaç belirli bir lokasyondaki insan trafiğini ve yoğunluğunu tespit edebilmektir. Bu amacı, KVKK sınırlamalarını aşmadan Wi-Fi paketlerini yakalayarak ve analiz ederek gerçekleştirdik. ESP8266 mikrokontrol kartı kullanılarak kapsama alanındaki Wi-Fi (Wireless Fidelity) trafiği dinlenmiştir. Yakalanan IEEE 802.11 paketlerinin MAC (Media Access Control) header kısmı alınarak, ortamdaki AP (Access Point) cihazlar ve STA (Station) cihazlar belirlenmiştir. Belirlenen STA cihazların MAC adresleri bir Wi-Fi ağına bağlanılarak Bulut Tabanlı API’ye (Application Programming Interface) gönderilmiş ve donanım üreticisi (vendor) tespiti yapılarak veritabanına kaydedilmiştir. Geliştirilen yönetim paneli sayesinde belirli bir konumdan geçen kalabalıklar Günlük, Haftalık, Aylık veya girilen zaman dilimine bağlı olarak analiz edilebilmektedir. Ayrıca Cihaz Sayısı/Vendor ve Cihaz Sayısı/Zaman grafikleri de çizdirilmiştir.

scholarly journals Urban Sensing with Spaceborne Interferometric Synthetic Aperture Radar

2021 ◽  
pp. 345-365
Author(s):  
Hongyu Liang ◽  
Wenbin Xu ◽  
Xiaoli Ding ◽  
Lei Zhang ◽  
Songbo Wu
Keyword(s):  
Remote Sensing ◽  
Synthetic Aperture Radar ◽  
Synthetic Aperture ◽  
Optical Remote Sensing ◽  
Microwave Radar ◽  
Urban Remote Sensing ◽  
Multi Temporal ◽  
Urban Sensing ◽  
Interferometric Sar ◽  
Aperture Radar

AbstractSynthetic aperture radar (SAR) and interferometric SAR (InSAR) are state-of-the-art radar remote sensing technologies and are very useful for urban remote sensing. The technologies have some very special characteristics compared to optical remote sensing and are especially advantageous in cloudy regions due to the ability of the microwave radar signals used by the current SAR sensors to penetrate clouds. This chapter introduces the basic concepts of SAR, differential InSAR, and multi-temporal InSAR, and their typical applications in urban remote sensing. Examples of applying the various InSAR techniques in generating DEMs and monitoring ground and infrastructure deformation are given. The capabilities and limitations of InSAR techniques in urban remote sensing are briefly discussed.

scholarly journals Persistent Scattering Interferometry SAR based Velocity and Acceleration Analysis of Land Deformation: Case Study on Kelok Sembilan Bridge

2018 ◽  
Author(s):  
Pakhrur Razi
Keyword(s):  
Synthetic Aperture Radar ◽  
Synthetic Aperture ◽  
Characteristic Analysis ◽  
Alos Palsar ◽  
Persistent Scatterer ◽  
Landslide Deformation ◽  
Land Deformation ◽  
Acceleration Analysis ◽  
Interferometric Sar ◽  
Aperture Radar

Characteristic analysis of land deformation in somearea is very helpful for mapping and preventing the impactof landslide. Here, Persistent Scatterer Interferometric (PSI)Synthetic Aperture Radar (SAR) technique has been appliedon 13 scenes of ascending track acquired by Advanced Land Observation Satellite Phased Array L-band Synthetic Aperture Radar (ALOS PALSAR) from July 2007 until November 2010 for characteristic analysis of the landslide. The technique is employed to identify and measure land deformation on the earth surface.The PSI technique has good accuracy in overcoming temporal and geometric decorrelation compared to conventional interferometric SAR technique. The result for analyzing landslide deformed area on Kelok Sembilan bridge has been identified. In addition, time series of landslide deformation history were used for calculatingthe past velocity and acceleration of landslide as well as forestimating for the future.

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