What is the difference between SAR and InSAR?

What is the difference between SAR and InSAR?

A SAR signal contains amplitude and phase information. Interferometric SAR (InSAR) exploits the phase difference between two complex radar SAR observations of the same area, taken from slightly different sensor positions, and extracts distance information about the Earth’s terrain.

What is InSAR used for?

InSAR (Interferometric Synthetic Aperture Radar) is a technique for mapping ground deformation using radar images of the Earth’s surface that are collected from orbiting satellites. Unlike visible or infrared light, radar waves penetrate most weather clouds and are equally effective in darkness.

What is InSAR how does it work and what does it measure?

Interferometric Synthetic Aperture Radar (InSAR) is an effective way to measure changes in land surface altitude. Synthetic Aperture Radar (SAR) imagery is produced by reflecting radar signals off a target area and measuring the two-way travel time back to the satellite.

How old is InSAR?

It was first used for the 1992 Landers earthquake, but has since been utilised extensively for a wide variety of earthquakes all over the world. In particular the 1999 Izmit and 2003 Bam earthquakes were extensively studied. InSAR can also be used to monitor creep and strain accumulation on faults.

Where can I find InSAR data?

You can download InSAR data from these websites: https://scihub.copernicus.eu/dhus/#/home. Please see ASF Vertex (https://vertex.daac.asf.alaska.edu/) for SAR data from different missions such as ERS, ALOS, Radarsat, and Sentinel-1. Sentinel-1 data can also be downloaded from the Copernicus website.

What is InSAR in remote sensing?

InSAR is a remote sensing modality for analysing radar images obtained by the satellites that are carriers of Synthetic Aperture Radar (SAR). The radar antenna continuously transmits microwaves towards the Earth’s surface and record waves reflected back to the antenna position.

What is the resolution of InSAR?

A spatial multilook-filter was applied to reduce the phase noise, leading to InSAR interferograms with a resolution of about 350 × 350 m2.

How accurate is InSAR?

The capabilities of the two techniques compliment each other where GPS can provide a 3-D deformation vector at each GPS station with an accuracy of a few millimeters, while InSAR can image the line-of-sight component of ground deformation over a large area at spatial resolution of tens of meters with an accuracy of …

What is SAR baseline?

What is Baseline? Baseline uses information from two synthetic aperture radar (SAR) images of the same target area acquired at different times (temporal baseline) and from slightly different satellite orbit positions (perpendicular baseline).

What is Ifsar data?

IFSAR stands for Interferometric Synthetic Aperture Radar. Developed just in recent years, IFSAR is a powerful approach in generating high-resolution digital data through the use of Digital Elevation Model (DEM) and an orthorectified radar image.

How do I get InSAR data?

What is interferometric synthetic aperture radar?

Interferometric Synthetic Aperture Radar (InSAR) is an imaging radar technique, in which additional information is calculated by comparing the phases of two images resulting from different aspect angles. The range resolution of radar sets is limited by their transmitter bandwidth.

What is interferometry in radar technology?

In radar technology, interferometry refers to all measurement methods in which a phase shift of the received signal is evaluated. Interferometric Synthetic Aperture Radar (InSAR) is an imaging radar technique, in which additional information is calculated by comparing the phases of two images resulting from different aspect angles.

What is synthetic aperture radar (SAR)?

Synthetic aperture radar (SAR) is a form of radar in which sophisticated processing of radar data is used to produce a very narrow effective beam. It can be used to form images of relatively immobile targets; moving targets can be blurred or displaced in the formed images.

Can radar interferometry be used to study ground subsidence?

“Radar interferometry techniques for the study of ground subsidence phenomena: a review of practical issues through cases in Spain”. Environmental Earth Sciences. 71: 163–181. doi: 10.1007/s12665-013-2422-z. hdl: 10045/36419.