Applying inSAR principles to detect surface deformation in Metro Manila
I have just attended an InSAR training showing how to detect surface deformation through phase differences between SAR signals. SAR satellite transmits microwave to earth and receives reflected microwave signals from earth surface. The intensity of received microwave indicates electromagnetic characteristics of objects, and phase indicates distance between aperture and object. Surface deformation is measured by the difference in two observed phases. The observed phase differences still contains errors that ought to be corrected along processing enumerated by the steps below. Getting SLC (Single-Look Complex) Co-registration (registration of Master and Slave images) Interferometry ( measuring phase differences) Corrections (Removal of Orbital and Topographic Fringe) Phase Unwrapping (integration of extracted to actual phase difference) Geocoding Visualization of Results in ENVI Analysis and Interpretation With the use of ALOS Palsar images from two different instances ...