A ground-based synthetic aperture radar (GB-SAR) interferometer is used to retrieve the velocity field of a landslide. High-resolution images are obtained by means time domain SAR processor. An in-depth analysis sequence interferograms enables recognition slowly deforming upper scarp in scene, and debris flow that feeds accumulation zone landslide, where fast change terrain morphology observed. The estimated deformation map agreement with available measurements Global Positioning System...

A method to derive accurate spatially dense maps of 3-D terrain displacement velocity is presented. It based on the merging velocities estimated by time series interferometric synthetic aperture radar (InSAR) data acquired along ascending and descending orbits repeated GPS measurements. The uses selected persistent scatterers (PSs) measurements horizontal velocity. An important step proposed mitigation impact atmospheric phase delay in InSAR data. shown that vertical at PS locations can be...

This work presents a methodology for the short-term forecast of intense rainfall based on neural network and integration Global Navigation Positioning System (GNSS) meteorological data. Precipitable water vapor (PWV) derived from GNSS is combined with surface pressure, temperature relative humidity obtained continuously ground-based station. Five years data one station in Lisbon, Portugal, are processed. Data precipitation also collected Spaceborne Spinning Enhanced Visible Infrared Imager...

We study the sub-ionospheric VLF transmitter signals recorded by Austrian Graz station in year 2020. Those radio are known to propagate Earth-ionosphere waveguide between ground and lower ionosphere. The facility (geographic coordinates: 15.46°E, 47.03°N) can receive such signals, particularly those propagating above earthquake (EQ) regions southern part of Europe. consider this work amplitude variations a few weeks before occurrence two EQs Croatia at distance less than 200 km from...

Flood area detection from multipass Synthetic Aperture Radar (SAR) data can be performed via amplitude change techniques. These methods allow flooded zones to discriminated only when they are at the time of second passage, and not first one. Coherence derived SAR interferometry used instead, as an indicator changes in electromagnetic scattering behaviour surface, thus potentially revealing all areas affected by flood event any between two passes. The paper presents a prototype application...

A method that is used to generate synthetic interferograms of the atmospheric phase delay temporal changes presented. The Weather Research and Forecasting Model forecast spatial distribution main parameters at acquisition times aperture radar (SAR) images. applied mitigate artifacts in SAR interferograms. Lisbon Region Pico Faial Islands Azores archipelago are chosen as case studies. They characterized by a different behavior properties. Results assessed means statistical analysis.

In this paper, we present the results of an experiment aiming to compare measurements atmospheric delay by synthetic aperture radar (SAR) interferometry and GPS techniques estimates numerical weather prediction. Maps differential are generated processing a set interferometric SAR images acquired ENVISAT-ASAR mission over Lisbon region from April November 2009. wet zenith carried out same area, covering time interval between first last acquisition. The Weather Research Forecasting (WRF) model...

The integration of interferometric synthetic aperture radar (InSAR) and GPS tomography techniques for the estimation 3-D distribution atmosphere refractivity is discussed. A methodology to use maps temporal changes precipitable water vapor (PWV) provided by InSAR as a further constraint in described. aim increase accuracy reconstruction atmosphere's refractivity. results, which are obtained with SAR data acquired over Lisbon area, Portugal, presented assessed. It has been found that...

Abstract Very high resolution precipitable water vapor maps obtained by the Sentinel‐1 A synthetic aperture radar (SAR), using SAR interferometry (InSAR) technique, are here shown to have a positive impact on performance of severe weather forecasts. case study deep convection which affected city Adra, Spain, 6–7 September 2015, is successfully forecasted Weather Research and Forecasting model initialized with InSAR data assimilated three‐dimensional variational improved space time...

Abstract In this work we present a methodology for the mapping of Snow Water Equivalent (SWE) temporal variations based on Synthetic Aperture Radar (SAR) Interferometry technique and Sentinel-1 data. The shift in interferometric phase caused by refraction microwave signal penetrating snow layer is isolated exploited to generate maps variation SWE from coherent SAR interferograms. main advantage proposed with respect those inversion backscattering models its simplicity reduced number required...

This paper presents a methodology to generate maps of atmosphere's precipitable water vapor (PWV) over large areas with length hundreds kilometers and width about 250 km, based on the use interferometric Sentinel-1A/B C-band synthetic aperture radar (SAR) data high spatial resolution 5 × 20 m <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sup> revisiting time six days. An algorithm calibrate merge PWV from different swaths Sentinel-1...

Global mean sea level rise associated with global warming has a major impact on coastal areas and represents one of the significant natural hazards. The Asia-Pacific region, which highest concentration human population in world, larger Earth being threatened by level. Recent studies indicate 3.2 mm/yr as measured from 20 years satellite altimetry. combined effect local land subsidence, can be overwhelming for areas. Synthetic Aperture Radar (SAR) interferometry technique is used to process...

This article presents a methodology for the monitoring of tall structures based on joint use terrestrial laser scanner (TLS), configured in line mode, and ground-based real aperture radar (GB-RAR) interferometer. The provides both natural frequencies oscillation amplitudes structures. Acquisitions surface structure are performed by TLS with high sampling rate: each scan an instantaneous longitudinal section. By interpolating points line, profiles estimated much better precision than single...

The Global Navigation Satellite System (GNSS) meteorology contribution to the comprehension of Earth’s atmosphere’s global and regional variations is essential. In GNSS processing, zenith wet delay obtained using difference between total hydrostatic delay. can also be converted into precipitable water vapor by knowing atmospheric weighted mean temperature profiles. Improving accuracy temperature, normally modeled surface meteorological parameters at coarse scales, leads a more accurate...

The potential of a coherent microwave radar for infrastructure health monitoring has been investigated over the past decade. Microwave measuring based on interferometry processing is non-invasive technique that can measure line-of-sight (LOS) displacements large with sub-millimeter precision and provide corresponding frequency spectrum. It capability to estimate vibration simultaneously remotely high accuracy repeatability, which serves long-term serviceability bridge structures within...

Various types of changes in the characteristics very low frequency (VLF) signals before earthquakes have been presented during past few decades. Most these observed on data with time sampling order a tenths second or minutes. Improvements this recent years indicated three new whose onsets minutes tens earthquake. These manifest themselves as reductions VLF signal amplitude and phase noises, excitation attenuation waves small wave periods both [1-5].In work, we present list parameters domains...

Electric field amplitude and phase measurements between narrowband VLF/LF transmitters receivers in the sub-ionospheric waveguide are affected altered by man-made natural sources (Nina 2024; Boudjada et al., 2024a,b). In this study we investigate Mw&amp;#8805;5.0 earthquakes (EQs) which occurred Europe during year 2024 based on data from INFREP receiver network (Biagi 2019; Moldovan 2015; Galopeau 2023). selected Mediterranean area with geographical longitude [-10&amp;#176;E, 40&amp;#176;E]...

The problem of phase unwrapping two-dimensional (2-D) signals has gained a considerable interest. It deals with the estimating (reconstructing) an absolute from observation its noisy principal (wrapped) values. This is ill-posed since many possible solutions correspond to given observation. Many algorithms have been proposed relying on different constraints for signal sampling process or nature (e.g., smoothness, regularity) signal. We look at these Bayesian point view (estimation theory)...

This paper studies the problem of assimilation precipitable water vapor (PWV), estimated by synthetic aperture radar interferometry, using Weather Research and Forecast Data Assimilation model 3-D variational data system. The experiment is designed to assess impact PWV on hydrometers rainfall predictions during 12 h after time. A methodology obtain calibrated maps their precision also presented. forecasts are compared with GPS estimates observations from a meteorological radar. Results show...

The aim of this paper is to describe how ground-based radar interferometry can provide displacement measurements earth dam surfaces and vibration frequencies its main concrete infrastructures. In many cases, dams were built decades ago and, at that time, not equipped with in situ sensors embedded the structure when they built. Earth have scattering properties similar landslides for which Ground-Based Synthetic Aperture Radar (GBSAR) technique has been so far extensively applied study ground...

Global Navigation Satellite System (GNSS) tomography provides 3-D reconstructions of atmosphere wet refractivity, related to water vapor. A simulated analysis the integration Positioning and future Galileo data is presented. Atmospheric refractivity derived from radiosonde acquired over Lisbon area. The impact on tomographic reconstruction assessed. Furthermore, horizontal anomalies are added a reference vertical profile atmospheric reproduce low-level dry or air intrusions, phenomenon...

This short communication studies the problem of terrain mapping by means ground-based synthetic aperture radar (GB-SAR) interferometry technique. A phase-to-height relationship tailored for GB-SAR interferometric configuration is introduced and verified a simulated analysis. sensitivity study carried out aiming to optimize use system derive precision this