@InProceedings{MuraParaGamaSilv:2016:MoSuMo,
author = "Mura, Jos{\'e} Cl{\'a}udio and Paradella, Waldir Renato and
Gama, F{\'a}bio Furlan and Silva, Guilherme Greg{\'o}rio",
affiliation = "{Instituto Nacional de Pesquisas Espaciais (INPE)} and {Instituto
Nacional de Pesquisas Espaciais (INPE)} and {Instituto Nacional de
Pesquisas Espaciais (INPE)} and {Instituto Nacional de Pesquisas
Espaciais (INPE)}",
title = "Monitoring of surface movement in a large area of the open pit
iron mines (Caraj{\'a}s, Brazil) based on a-DInSAR techniques
using TerraSAR-X data",
year = "2016",
organization = "SPIE Remote Sensing",
abstract = "This work presents an investigation of ground deformation
measurements based on a combination of DInSAR TimeSeries (DTS) and
PSI (Persistent Scatterer Interferometry) techniques, applied in a
large area of the open pit iron mines located in Caraj{\'a}s
Mineral Province (Brazilian Amazon Region). These mines have
presented a historical of instability and surface monitoring
measurements over sectors of the mines (pit walls) have been
carried out based on ground based radar and total station
(prisms). PSI processing technique involves the temporal phase
unwrapping process, which is a very important stage to determine
ground movement accurately. Limitations in this process can be
found especially for detection of high movement rates. By using a
priori information regarding the topographic phase error and phase
displacement model, temporal phase unwrapping in the PSI
processing can be performed more efficiently. In this study we
used a combination of DTS and PSI techniques aim at detecting high
rate of linear and non linear ground movement. The DTS results
provided the first estimate of the topographic error and the phase
displacement model for the PSI analysis using the IPTA technique
(Gamma RS software). A set of 33 TerraSAR-X-1 images, acquired
during the period from March 2012 to April 2013 (dry and wet
seasons), was used to perform this investigation in the
Caraj{\'a}s mining area. Due to complex topography of the site
(deep excavations, high waste piles, etc.), a high resolution DEM
was generated based on a stereo GeoEye-1 pair in order to decrease
the topography phase error in the analysis. The DTS analysis was
carried out on a stack of multi-look unwrapped interferogram using
an extension of the SVD to obtain the Least-Square solution. A set
of additional weighted constrain on the acceleration of the
surface was used to control the smoothness of the time-series
solutions aiming to correct the atmospheric phase artifacts and
estimate the height errors based on the normal baseline diversity.
The height errors and deformation rates provided by the DInSAR
timeseries approach were subtracted from the stack of original
interferogram to perform the PSI analysis. This procedure improved
the capability of the PSI analysis to detect non linear
deformation as well as increased the numbers of point density of
the final results. The results of the individual and combined
techniques are presented and highlighted. A High deformation rates
were detected over the waste piles (deformation rate up to -526.5
mm/year), which is normally expected for this manmade structure.
Non linear deformation was also detected along benches and ramps
(deformation rate up to -255.7 mm/ year), which is associated with
surface movement evidences (fractures on bench walls, cracks on
bench surfaces and road ramps), which is associated with deep
excavation on low quality geomechanical ore/rock masses.
Structural control given by trending shear zone and trending fault
system could also be associated with these movements. The proposed
methodology showed good results for monitoring surface
displacement in a large mining area, which is located in a rain
forest environment, providing very useful information about the
ground movement planning and risks assessment.",
conference-location = "Edinburgh, United Kingdom",
conference-year = "26-29 Sept.",
targetfile = "mura_monitoring2.pdf",
urlaccessdate = "28 abr. 2024"
}