Applications

Time-Series Analysis Mapping
Seasonal Time-Series Analysis Seasonal Deformation

Using differential interferometry, we implement a new type of analysis that exploits a time series of coherent SAR acquisitions. In this example, we detect periodic ground motion in the San Jacinto Valley in Southern California. 		Los Angeles PALSAR Imagery Los Angeles, California (PALSAR)

We present results derived from two coherent acquisitions of PALSAR data acquired over the Los Angeles area of Southern California.
Oil, Gas, and Mining
Subsidence in Vegetated Areas Subsidence in Vegetated Areas

Neva Ridge is studying the capability of SAR interferometry (InSAR) to provide ground motion measurements in regions of significant vegetation. Using L-band PALSAR data provided by the Alaska Satellite Facility, we are investigating surface signatures associated with mining activity in Pennsylvania and Ohio. The displacement image shown here contains several features which indicate ground subsidence on the order of 25 centimeters, during a 2-year period. The centers of some of these features are decorrelated, presumably due to aliasing as a result of motions that are too fast to measure. The current hypothesis is that these features are associated with ongoing long wall mining operations. We are currently working with a state agency to better understand these measurements and to correlate them with known mining operations.
Baldwin Hills Oil and Gas Baldwin Hills, California

Using the phase information contained within a SAR image, it is possible to measure topographic height and height changes using SAR interferometry techniques. In this example, we observe uplift near Inglewood oil field in Baldwin Hills, California. This upward motion may be the result of an injection process.
Hydrology
Hydrology Overview

Using the phase information contained within a SAR image, it is possible to measure topographic height and height changes using SAR interferometry techniques. 		Chino Hydrolog Chino, California

Between 1993 and 1995, a maximum subsidence of over 12 centimeters was observed due to groundwater pumping.
Phoenix Hydrology Pheonix, Arizona

In this example, we observe ground subsidence in Phoenix, Arizona due to groundwater pumping. 		Las Vegas Hydrology Las Vegas, Nevada

In this example, we observe ground subsidence in Las Vegas, Nevada due to groundwater pumping.
Geology
Sendai Earthquake Induced Ground Motion Sendai Earthquake Induced Ground Motion

The Sendai (Tohoku) Earthquake occurred on March 11, 2011, with an epicenter approximately 70 kilometers east of the Japan coast. The magnitude 9.0 quake, and the ensuing tsunami, had a devastating effect on the country's population and infrastructure. Differential interferometric SAR measurements demonstrate the scale of the resulting ground motion over hundreds of kilometers.
Haiti Earthquake Induced Ground Motion Haiti Earthquake Induced Ground Motion

On January 12, 2010 a M7.0 earthquake struck Haiti along the Enriquillo Fault. The epicenter was approximately 25 km from the major city of Port-au-Prince and caused extensive damage in the urban area. Using L-band PALSAR data acquired on September 3, 2009 and January 25, 2010, a differential interferogram was constructed by Neva Ridge which revealed the large ground motions associated with the quake.
Crandall Canyon Mine Crandall Canyon Mine, Utah

In August 2007, collapses at the Crandall Canyon coal mine in Utah killed 6 miners and 3 rescuers. In support of the resulting Mine Safety and Health Administration investigation, Neva Ridge performed Differential Interferometric SAR (DifSAR) processing and analysis. 		Bam Iran Bam, Iran Earthquake

Using the phase information contained within a SAR image, it is possible to measure topographic height and height changes using SAR interferometry techniques. In this example, we observe the geological changes due to a magnitude 6.6 earthquake which struck near Bam, Iran on December 26, 2003.
Synthetic Aperture Photogrammetry
Camper Motorhome Experiment

Synthetic Aperture Photogrammetry (SAP) is an incoherent synthetic aperture technique that allows one to perform a number of optical processes that can synthesize a much larger lens. We present here a demonstration and simulation of this technique using a motorhome parked within a forest.
Additional Information
Subsidence and Ground Motion Subsidence and Ground Motion Measurements using Differential Interferometry (PDF)

Synthetic Aperture Photogrammetry Synthetic Aperture Photogrammetry (PDF)

Wetlands Change Detection Change Detection of Wetlands Damage after Katrina near New Orleans (PDF)