Sensors 2009, 9, 1876-1912; doi:10.3390/s90301876 OPEN ACCESS sensors ISSN 1424-8220 www.mdpi.com/journal/sensors Review Applications of SAR Interferometry in Earth and Environmental Science Research Xiaobing Zhou 1,*, Ni-Bin Chang 2 and Shusun Li 3 1 Department of Geophysical Engineering, Montana Tech of The University of Montana, Butte, MT 59701, USA; E-Mail:
[email protected] (X.Z.) 2 Department of Civil, Environmental, and Construction Engineering, University of Central Florida, 4000 Central Florida Blvd.; Orlando, FL 32816, USA; E-Mail:
[email protected] (N.B.C.) 3 Geophysical Institute, University of Alaska Fairbanks, 903 Koyukuk Drive, P.O. Box 757320, Fairbanks, AK 99775-7320, USA; E-Mail:
[email protected] (S.L.) * Author to whom correspondence should be addressed; E-Mail:
[email protected] (X.Z.); Tel.: +1-406-496-4350; Fax: +1-406-496-4704 Received: 23 September 2008; in revised version: 10 December 2008 / Accepted: 12 March 2009 / Published: 13 March 2009 Abstract: This paper provides a review of the progress in regard to the InSAR remote sensing technique and its applications in earth and environmental sciences, especially in the past decade. Basic principles, factors, limits, InSAR sensors, available software packages for the generation of InSAR interferograms were summarized to support future applications. Emphasis was placed on the applications of InSAR in seismology, volcanology, land subsidence/uplift, landslide, glaciology, hydrology, and forestry sciences. It ends with a discussion of future research directions. Keywords: InSAR, phase, interferogram, deformation, remote sensing. 1. InSAR Overview of InSAR 1.1. Introduction Interferometric synthetic aperture radar (InSAR) is a rapidly evolving remote sensing technology that directly measures the phase change between two phase measurements of the same ground pixel of Sensors 2009, 9 1877 the Earth’s surface.