José Claudio Mura | Instituto Nacional de Pesquisas Espaciais (original) (raw)

Papers by José Claudio Mura

A SAR Processor for airborne and spaceborne platforms is presented. A bidimensional azimuth refer... more A SAR Processor for airborne and spaceborne platforms is presented. A bidimensional azimuth reference function and a hybrid correlation algorithm is used in order to correct the range migration during the azimuth compression. The interferometric capability of this SAR Processor is evaluated using two scenes of the ERS-1 System and the results are presented.

2015 IEEE International Geoscience and Remote Sensing Symposium (IGARSS), 2015

This paper presents the results of applying SBAS (Small Baseline Subset) differential interferome... more This paper presents the results of applying SBAS (Small Baseline Subset) differential interferometric technique using 33 Stripmap mode images from the TerraSAR-X satellite, over a 1-year monitoring, Stripmap mode, for detection of ground deformation processes in five Carajas open pit iron mines in the state of Pará/Brazil in Amazon region, characterized by torrential rains. The SBAS algorithm was used for the interferometric processing, with coherence threshold of 45%, 4 looks, Delaunay Minimum Cost Flow (MCF), with a reference GeoEye-1 DEM, which allowed obtaining a synoptic view of the mine complex, covering the infrastructure and benches, as well as detecting the deformation in one mine (N5W). In order to monitor the waste piles, a lower coherence value (30%) was necessary. The results obtained were consistent with field work data, including topographic surveying, showing that this technique can be very useful for ground movement alert, planning, and risk assessment.

Mining

This article presents an investigation of ground movement measurements based on a combination of ... more This article presents an investigation of ground movement measurements based on a combination of TerraSAR-X and Sentinel-1 data, in opposite tracks, aiming to detect ground de-formation of the remaining dikes of Germano mine, after the Fundão dam collapse. The differential interferometry technique SBAS (Small Baseline Subset) was applied to obtain the deformation of the surface in different Line of Sight (LoS), in order to carry out the vector decomposition and generate the deformation measurements in the vertical and horizontal directions. A set of 37 single-look complex (SLC) images of TerraSAR-X (TSX), acquired during the period from 19 February 2016 to 15 May 2017, and 37 SLC images of Sentinel-1, acquired from 8 February 2016 to 15 May 2017, were used to perform this investigation. For the TerraSAR-X interferometric processing, a coherence threshold of 40%, 4 looks in range and 2 looks in azimuth, 1200 m of atmospheric filter, and 10 % of max normal baseline of the critical wer...

DOAJ (DOAJ: Directory of Open Access Journals), Oct 1, 2006

Boletim De Ciencias Geodesicas, 2019

Análise de atributos das técnicas de decomposição de alvos e razões polarimétricas para a discrim... more Análise de atributos das técnicas de decomposição de alvos e razões polarimétricas para a discriminação de classes de uso e cobertura da terra na região do Tapajós

Journal of Applied Remote Sensing, Dec 22, 2015

The Azul mining complex, located in the Carajás Mineral Province, Amazon region, encompasses the ... more The Azul mining complex, located in the Carajás Mineral Province, Amazon region, encompasses the most important manganese mine in Brazil. Vale S.A. company operates three simultaneous open pit excavations (mines 1, 2, and 3) in the area, which are conducted on rock alteration products of low geomechanical quality related to sandstones, siltstones, and a lateritic cover. In order to monitor ground deformation, 33 TerraSAR-X (TSX-1) StripMap images covering the period of March 2012-April 2013 were used in the investigation. An advanced differential interferometric synthetic aperture radar (A-DInSAR) approach based on persistent scatterer interferometry (PSI) using an interferometric point target analysis algorithm was applied, and the results showed that most of the area was considered stable during the time span of the synthetic aperture radar acquisitions. However, persistent scatterers (PS) with high deformation rates were mapped over a waste pile, probably related to settlements, and also along the north flank of mine 1, indicative of cut slope movements toward the center of the pit. A spatial relationship of geological structures with PS was observed for this sector of the mine, given by PS showing deformation rates concentrated along a structural corridor with faults, fractures, and folds related to the Carajás fault system. Though only ground-based radar measurements for wall benches of mine 1 were available for a short time period of the TSX-1 coverage, the PS movement patterns showed concordance with geotechnical field measurements. The investigation emphasized the important role that satellite-based A-DInSAR can play for deformation monitoring and risk assessment in this kind of mining area. © The Authors. Published by SPIE under a Creative CommonsAttribution 3.0 Unported License. Distribution or reproduction of this work in whole or in part requiresfull attribution of the original publication, including its DOI.

Proceedings of SPIE, Feb 1, 2002

In this paper we investigate a least square algorithm to retrieve forest parameters from interfer... more In this paper we investigate a least square algorithm to retrieve forest parameters from interferometric, fully polarimetric radar remote sensing P-band data, based on an interferometric optimization scheme which is applied to maximize the separation of scattering phase centers related to the pertinent interferometric coherences in order to obtain most accurate parameter inversion results. A recently developed approach is especially adopted to airborne P-band data, introducing a least square minimization scheme in which synthetic interferometric coherences computed from a scattering model, which is based on a randomly oriented volume over a non-penetrable ground, are compared with three interferometric coherences measured by the P-band sensor. Through fitting of the synthetic and the measured interferometric coherences, the pertinent candidate parameters of the optimization problem can be retrieved. These parameters are the forest volume thickness, the volume extinction coefficient, the interferometric phase related to the underlying topography, and the effective ground-to-volume amplitude ratios related to the interferometric coherences. Through a weighted superposition of all the interferometric coherences provided by the fully polarimetric radar sensor these coherences can be maximized and introduced as the right-hand side of the parameter optimization problem. Experimental results obtained from P-band fully polarimetric single baseline interferometric data acquired over the amazon rain forest are shown in order to demonstrate the potential of the proposed approach. Furthermore, a (chi) 2-test is performed on the data to prove the validity of the introduced scattering model for rain forest vegetation.

Abstract. This paper presents a novel method for estimating the absolute phase offset in interfer... more Abstract. This paper presents a novel method for estimating the absolute phase offset in interferometric synthetic aperture radar (SAR) measurements for digital elevation model (DEM) generation. The method is based on “phase-offset functions (POF), ” relating phase offset to topographic height, and are computed for two different overlapping interferometric data acquisitions performed with considerably different incidence angles over the same area of interest. For the purpose of extended mapping, opposite viewing directions are preferred. The two “phase-offset functions ” are then linearly combined, yielding a “combined phase-offset function (CPOF)”. The intersection point of several straight lines (CPOFs), corresponding to different points in the overlap area allows for solving the phase offset for both acquisitions. Aiming at increasing performance and stability, this intersection point is found by means of averaging many points and applying principal component analysis. The method...

1995 International Geoscience and Remote Sensing Symposium, IGARSS '95. Quantitative Remote Sensing for Science and Applications

2012 IEEE International Geoscience and Remote Sensing Symposium, 2012

ABSTRACT This paper analyses the use of an algorithm to estimate the unknown interferometric phas... more ABSTRACT This paper analyses the use of an algorithm to estimate the unknown interferometric phase offsets without the use of ground control points or already calibrated data. Modifications in order to enhance the precision and robustness of the algorithm are presented and the new implementation is validated with X-band airborne SAR data. Furthermore, issues related with the use of the algorithm for P-band datasets are discussed and experimental results are shown for this kind of data. The stability of the algorithm according to the choice of the area of the image used for the estimation and to the choice of the coherence threshold is also verified for both X- and P-band data sets.

2007 IEEE International Geoscience and Remote Sensing Symposium, 2007

IEEE International Geoscience and Remote Sensing Symposium

ABSTRACT Shows the capacity of P-band polarimetric images to define the space of attributes of pr... more ABSTRACT Shows the capacity of P-band polarimetric images to define the space of attributes of primary forest and secondary succession, through the analysis of the relation among backscatter and basal area data. To ensure that different landscapes of Amazon upland forest are represented, a test-site located in the Tapajo´s region was selected. Statistical regression model was used to verify the relation between basal area values (37 plots) and backscatter data derived from PHH, PHV and PVV images. An analysis of the spatial configuration of backscatter values for primary forest and secondary succession is made, considering the intrinsic variations of these formations in terms of biometric parameters. For this thematic stratification, a contextual Markovian classification technique (Iterated Conditional Modes CM) was used in polarimetric P-band images, to delineate primary forest and regeneration areas, in association with basal area intervals. The advance that was reached with the treatment of P-band data could improve the regional monitoring process of the land cover change, a process whose speed was accelerated as a result of human action in the Amazon during the last two decades.

Digital elevation models (DEM) are numerical representation of terrain elevation data that has be... more Digital elevation models (DEM) are numerical representation of terrain elevation data that has been used in a wide range of spatial analysis applications. The principles for acquisition, storage, management, update, spatial analysis, visualization as well as integration with other systems are reasonably well known. However, as DEM applications are becoming increasingly more widespread, so does concern about the quality of the available elevation data and the propagation of DEM errors through the analysis. It is now well known by analysts and researchers that the results of many DEM-based quantitative operations are significantly affected by the magnitude and also by the spatial distribution of elevation errors in DEM. However, currently available DEM's frequently report only the average magnitude of errors as the root mean square error (RMSE), which does not provide information on systematic bias nor on the spatial patterns of the DEM errors (Heuvelink, 1998). A very important ...

marte.dpi.inpe.br

The main goal of this paper was to establish the relationship between the forest dendrometric par... more The main goal of this paper was to establish the relationship between the forest dendrometric parameters and the interferometric and radiometric image response, obtained from a SAR sensor (Synthetic Aperture Radar), using multivariable regression techniques. A 6,1 year old Eucalyptus grandis populated area was selected for the study. The results pointed out that the stand volume was highly correlated with the interferometric height logarithm (LogHint), obtained by the difference between interferometric models in X and P bands, whereas the DBH presented better relationship with the combination of VV coherence (CohPvv) and the LogHint. The total vegetation height, similar to the DBH, was better explained by the combination of CohPvv and LogHint. The results showed that due to the fact that the population of individuals whose structure was predominantly cylindrical and vertically oriented, caused a higher interaction with the vertical polarization. The higher wavelength P band radiometry efficacy wasn't as good as the interferometry (CohPvv and LogHint) to estimate the dendometric parameters studied, which obtained 84 to 88% of determination coefficient in relation to the area forest inventory.

Anais do I Simpósio Brasileiro de Arquitetura de Computadores e Processamento Paralelo (SBACC 1987)

Após uma breve introdução sobre as atividades de Processamento de Imagens no INPE, são mostradas ... more Após uma breve introdução sobre as atividades de Processamento de Imagens no INPE, são mostradas as características principais da familia de sistemas SITIM, seguindo-se uma apresentação dos tipos de procedimentos mais utilizados em Processamento de Imagens. São discutidas algumas opções jã testadas para aumento de desempenho do sistema, através do uso de placas aceleradoras, e ao final são apresentadas as perspectivas de desenvolvimento futuro, tanto na área de placas aceleradoras como sistemas baseados em arquitetura paralela, associados a unidades de armazenamento de imagens avançadas.

A SAR processor for airborne and spaceborne platforms is presented. A bidimensional azimuth refer... more A SAR processor for airborne and spaceborne platforms is presented. A bidimensional azimuth reference function and a hybrid correlation algorithm is used in order to correct the range migration during the azimuth compression. The interferometric capability of this SAR processor is evaluated using two scenes of the ERS-1 system and the results are presented.

Nasa Sti Recon Technical Report N, Oct 1, 1991

Remote Sensing, 2013

Persistent Scatterer interferometry (PSI) represents a powerful tool for the detection and monito... more Persistent Scatterer interferometry (PSI) represents a powerful tool for the detection and monitoring of tiny surface deformations in vast areas, allowing a better understanding of its triggering mechanisms, planning of mitigation measures, as well as to find better solutions for social and environmental issues. However, there is no record hitherto of its use in active open pit mine in tropical rainforest environment. In this paper we evaluate the use of the PSI technique for the detection and monitoring of mine slope deformations in the N4W iron mine and its surroundings, Pará State, Northern Brazil. The PSI processing was performed with 18 ascending SAR scenes of the TerraSAR-X satellite acquired in the dry season of 2012. The results showed a significant number of widely distributed persistent scatterers. It was observed that most of the study area was stable during the time span. Nevertheless, high deformation rates (312 mm/year) were mapped over the mine waste piles, but do not offer any hazard, since they are expected displacements of meters in magnitude for these manmade land structures. Additionally, it was mapped tiny deformation rates in both the east and west flanks of pits 1 and 2. The main underlying reasons can be assigned to the accommodation phenomena of very poor rock masses, to the local geometric variations of the slope cuts, to the geological contact between ironstones and the country rocks, to the exploitation activities, as well as to the