GRAV-MAG SUITE - An open source MATLAB-based program for processing potential field data

Castro, Fuertes; Oliveira, Suely; Souza, Juliano de; Ferreira, F.J.F.

doi:10.22564/8simbgf2018.067

Cited by 8 publications

(7 citation statements)

References 19 publications

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“…In order to automate the described process, we used a MATLAB graphical user interface named as LGM -Lithogeophysical Maps. The LGM is inserted in the GRAV-MAG SUITE (Castro et al 2018), which could be used to process potential field data. The LGM program separately processes the AGRS data for each radioelement and then combines the products in a single map.…”

Section: Methodsmentioning

confidence: 99%

Statistical analysis for lithogeophysical maps using airborne gamma-ray spectrometry

Weihermann¹,

Castro²,

Castro³

et al. 2019

Proceedings of the 16th International Congress of the Brazilian Geophysical Society&Expogef

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Section: Methodsmentioning

confidence: 99%

Statistical analysis for lithogeophysical maps using airborne gamma-ray spectrometry

Weihermann¹,

Castro²,

Castro³

et al. 2019

Proceedings of the 16th International Congress of the Brazilian Geophysical Society&Expogef

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“…The TDR+TDX and TDR-TDX filters are implemented within GRAV-MAG SUITE, an open-source MATLAB© graphical environment for processing potential field data (Castro et al, 2018). For implementation in Geosoft's Oasis Montaj© package, we recommend to compute the local phase filters (TDR and TDX) in the "Grid Math Expression Builder" section of "Grid and Image" menu to ensure that all filters will be enclosed in the range…”

Section: Methodsmentioning

confidence: 99%

Combining Tilt Derivative Filters: New Approaches to Enhance Magnetic Anomalies

Castro¹,

Oliveira²,

Souza³

et al. 2018

Braz J Geophys

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ABSTRACT. We extend the concept of two earlier enhancement techniques based on the local phase of the magnetic anomaly, namely the vertical (TDR) and horizontal (TDX) tilt angles, which are defined by the inverse tangent of ratios involving the total horizontal gradient and the vertical derivative. These filters are useful to locate both shallow and deep sources, because they equalize the signal amplitudes. The proposed approach is based on the addition and subtraction of TDR and TDX. The TDR+TDX filter produces constant values over the causative bodies, while TDR-TDX generates peaks over the center of bodies and is constant out of them. By applying the proposed techniques to synthetic and aeromagnetic data we show that they locate more clearly the centers and edges of the sources in comparison to TDR and TDX, respectively. The combined filters have essentially the same computational cost as TDR and TDX and can replace them as auxiliary interpretation tools.Keywords: Qualitative Methods, Local Phase Filters, Aeromagnetic Data.RESUMO. Estendemos o conceito de duas técnicas de realce baseadas na fase local da anomalia magnética: as inclinações do sinal analítico (TDR) e do gradiente horizontal total (TDX), definidos pelo arco tangente de razões envolvendo o gradiente horizontal total e a derivada vertical. Estes filtros são úteis para localizar tanto fontes rasas quanto profundas. O método proposto baseia-se na adição e subtração dos filtros TDR e TDX. O filtro TDR+TDX produz valores constantes sobre as fontes causadoras, enquanto que o TDR-TDX produz picos sobre o centro dos corpos e é constante onde fontes causadoras não são verificadas. Aplicando as técnicas propostas aos dados sintéticos e reais mostra-se que elas localizam mais claramente os centros e as bordas dos corpos em comparação com o TDR e o TDX, respectivamente. Os filtros combinados têm essencialmente o mesmo custo computacional dos filtros originais, TDR e TDX, e podem substituí-los como ferramentas de interpretação.Palavras-chave: Métodos Qualitativos, Filtros de Fase Local, Dados Aeromagnéticos. Federal

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“…Interpolation technique serves as edge detection and can be used as a smoothening tool on existing data. There are different alternative interpolation methods such as linear, nearest, bilinear, next, previous, p-chip, cubic, bicubic, v5cubic, maxima or spline [4]. The MATLAB algorithm was used with linear, nearest neighbour and piecewise cubic interpolant to determine the interpolation RMI field distribution from the measured magnetic data.…”

Section: Interpolationmentioning

confidence: 99%

“…Magnetic measurement can be acquired either through air, sea or spaceborne.Airborne magnetic method is referred to as theaeromagnetic method. The aeromagnetic method has been commonly used for various investigations such as geological analysis and mineral exploration [4].…”

Section: Introductionmentioning

confidence: 99%

“…MATLAB is a high level programming language that serves as a platform for technical computing such as data analysis, algorithm development and simulation. Few authors such as [2][3][4][5] and [8]has used MATLAB for processing and analysing potential field data. Thus, the use of MATLAB contributed to many freeware and open-source codes, which are based on solution to a specific issue relating to potential field [2].…”

Section: Introductionmentioning

confidence: 99%

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Aeromagnetic data processing using MATLAB

Oni

Aizebeokhai

2022

IOP Conf. Ser.: Earth Environ. Sci.

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This study focuses on the evaluation of magnetic field variation in a two-dimensional plot in form of a contour map by carrying out interpolation on the magnetic field data and mapping regional structures to infer the direction of dykes. To pinpoint areas of magnetic highs and lows, MATLAB program was used to delineate magnetic field trends on the data. The program was also used to produce graphical, colourized and contoured plots of data from XYZ files (data with random locations) using interpolation functions. The program was used for both gridding and smoothening of the magnetic field data and also allow the setting of contour values and utilization of vivid colour scales. The aeromagnetic data vector may contain outliers which are due to instrumental error and data extraction during field data collection. These outliers were removed and replaced using three interpolation methods including linear, nearest-neighbour and cubic spline to have a non-distorted representation plot and they were also used to fit surfaces to the gridded data. The result shows that the piecewise cubic spline interpolant contour plot has finer precision with higher details at the output edges. From the piecewise linear surface B(X,Y), where X is normalized by mean 2.235e+05 and standard deviation of 3.202e+04 and Y is normalized by mean 7.809e+05 and standard deviation of 551. The residual magnetic intensity plot shows the magnetic field range between -200 nT for magnetic low and 200 nT for magnetic high. However, the use of MATLAB is not to displace Oasis Montaj geosoftware but to give more scientific meaning to the automation of the filtering techniques used in Oasis.

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GRAV-MAG SUITE - An open source MATLAB-based program for processing potential field data

Cited by 8 publications

References 19 publications

Statistical analysis for lithogeophysical maps using airborne gamma-ray spectrometry

Statistical analysis for lithogeophysical maps using airborne gamma-ray spectrometry

Combining Tilt Derivative Filters: New Approaches to Enhance Magnetic Anomalies

Aeromagnetic data processing using MATLAB

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