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ARIA Data Products

Continuous Automated InSAR Analysis

 

The ARIA Project can provide continuous interferometric synthetic aperture radar (InSAR) monitoring of regions in order to automatically generate the intermediate products necessary for advanced analysis and higher level data products.

 

InSAR Products

 

Interferograms

By monitoring the satellite data acquired over a specified region, ARIA can automatically generate interferograms comparing displacement on two or more dates.  These automatic products are formed based on a pre-determined set of rules that define imaging parameters such as range and azimuth looks, temporal baseline, and pairing direction.  While the ARIA system uses a set of default values, advanced users can override these settings to create custom interferogram products.

 


Displacement Time Series

 

Displacement Time-Series products provide a representation of changing ground displacement in a region over a specified time period. By stacking multiple interferogram products, the ARIA system can produce an interactive map comparing the change of any point in the region to a geodetically stable reference point. The time series can also be downloaded for use in modeling.
 

Displacement Time-Series products can be used to monitor volcanic inflation, landslide creep, reservoir subsidence, and other ground deforming geophysical processes.

 


Damage Proxy Maps (DPMs)

Damage Proxy Maps (DPMs) provide estimates from satellite radar of where an earthquake has caused significant damage.  The color scale moves from yellow to red indicating increasing levels of disruption and potential damage.

When combined with building maps, the damage proxy map can be used to identify structures that may have been damaged by a seismic event or other damaging event (e.g., wind damage from hurricanes). The maps are also useful for identifying scale of damage over large regions, as well as damage in remote regions where communication from the ground is not available and/or access is difficult.

Damage Proxy Maps (DPMs) can be available between one day to several days after an earthquake, depending on the availability of earliest post earthquake radar observations.

 


Flood Proxy Maps (FPMs)

 

Flood Proxy Maps (FPMs) provide estimates from satellite radar data of areas likely to have experienced significant flooding.  Light blue color indicates regions likely inundated with water.

 

When combined with in-situ observations and validation, Flood Proxy Maps (FPMs) can be used to identify significantly inundated areas and help plan responses.

 

Flood Proxy Maps (FPMs) can be available between one to six days after the onset of an event, depending upon the availability of satellite radar observations.

 


Log-Amplitude-Ratio Products (LARs)

Log-Amplitude-Ratio products (LARs) are complex scenes that represent the amplitude ratio of synthetic aperture radar data.  These products are used for creating Flood Proxy Maps (FPMs) and Damage Proxy Maps (DPMs).


Coseismic Surface Displacements

ARIA automatically generates coseismic surface displacement maps based on Copernicus Sentinel-1 synthetic aperture radar (SAR) data, generating interferograms that can be used for identifying surface ruptures and to constrain fault slip models.  These coseismic interferograms are triggered for earthquakes greater than M7 and/or with red PAGER alerts (significant economic losses or casualties predicted).  Automated GPS coseismic displacements are in progress.


Earthquake Source Models

By combining GPS, InSAR, and seismic data, ARIA can automatically generate and update earthquake source models.  These models can provide accurate fault size and magnitude estimates for higher-level data products and in-the-field verification.