Use of Edge Delineating Methods in Interpreting Magnetic Archaeological Prospection Data

Stampolidis, Alexandros; Τσοκασ, Γ. Ν.

doi:10.1002/arp.1424

Cited by 25 publications

(8 citation statements)

References 44 publications

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“…Many methods have been suggested to delineate geophysical anomalies in raster data, most notably based on the calculation of gradients, for example the normalized gradient (Ma and Li, 2012) or the analytical signal (Nabighian, 1972;Tabbagh et al, 1997). Other methods are linked to the specific properties of certain geophysical data, such as Euler deconvolution of magnetometer surveys (Reid et al, 1990) or other complex parameters (Stampolidis and Tsokas, 2012). However, all these methods become unreliable when the noise level in the data (the signal-to-noise ratio) becomes very poor.…”

Section: Methodsmentioning

confidence: 99%

Raster was Yesterday: Using Vector Engines to Process Geophysical Data

Schmidt¹,

Tsetskhladze

2013

Archaeological Prospection

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Tools for the processing of raster data are well developed, but noisy data still pose considerable challenges. If anomalies are broken up into isolated individual readings, for example due to high noise levels, it may still be possible for a human interpreter to recognize the isolated readings as being part of a single anomaly. However, such a concept of neighbourhood is difficult to implement with raster tools and an alternative, vector‐based approach is presented here. By converting the measured raster data into polygons, it is possible to undertake shape and neighbourhood analysis to process the data. This allows discriminating, reshaping and merging of the anomalies based on their spatial location relative to each other (neighbourhood) and with respect to the size of each anomaly. The added advantage of this approach is the possibility to use the processed vector data as a basis for interpretation and visualization diagrams in two‐ and three dimensions. This method is applied to the GPR survey of a necropolis at Pessinus, showing several types of grave monuments. Copyright © 2013 John Wiley & Sons, Ltd.

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Section: Methodsmentioning

confidence: 99%

Raster was Yesterday: Using Vector Engines to Process Geophysical Data

Schmidt¹,

Tsetskhladze

2013

Archaeological Prospection

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“…2e, g), which is in the case of the transformation of the TDX much more expressive. The special transformation TDXAS (Stampolidis and Tsokas, 2012), which should be seen rather as a mathematical filter (multiplication of fields AS and TDX) is very interesting. We find the physical reality of this transformation very difficult.…”

Section: Calculations Of Transformed Fields From Complete Bouguer Anomentioning

confidence: 99%

High resolution Slovak Bouguer gravity anomaly map and its enhanced derivative transformations: new possibilities for interpretation of anomalous gravity fields

Pašteka

Zahorec

Kušnirák

et al. 2017

Contributions to Geophysics and Geodesy

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Abstract:The paper deals with the revision and enrichment of the present gravimetric database of the Slovak Republic. The output of this process is a new version of the complete Bouguer anomaly (CBA) field on our territory. Thanks to the taking into account of more accurate terrain corrections, this field has significantly higher quality and higher resolution capabilities. The excellent features of this map will allow us to re-evaluate and improve the qualitative interpretation of the gravity field when researching the structural and tectonic geology of the Western Carpathian lithosphere. In the contribution we also analyse the field of the new CBA based on the properties of various transformed fields -in particular the horizontal gradient, which by its local maximums defines important density boundaries in the lateral direction. All original and new transformed maps make a significant contribution to improving the geological interpretation of the CBA field. Except for the horizontal gradient field, we are also interested in a new special transformation of TDXAS, which excellently separates various detected anomalies of gravity field and improves their lateral delimitation.

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“…The equation of the total horizontal derivative (THD) for the grid is:

THD (x, y) = \sqrt{{((), \frac{\partial f}{\partial x})}^{2} + {((), \frac{\partial f}{\partial y})}^{2}}

where f ( x , y ) is the apparent conductivity response (Everett, 2013). Use of the total horizontal derivative is common in archaeology with magnetic data sets, both simulated (Stampolidis and Tsokas, ) and archaeological (Büyüksaraç et al ., ). The THD is rarely used with EM data; an exception is Beamish (), who recently used the THD with airborne EM data.…”

Section: Geophysical Studiesmentioning

confidence: 99%

Ground‐penetrating Radar and Electromagnetic Archaeogeophysical Investigations at the Roman Legionary Camp at Legio, Israel

Pincus¹,

Smet

Tepper

et al. 2013

Archaeological Prospection

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Historical sources indicate that the Roman Sixth Legion Ferrata established a permanent camp in the Jezreel Valley (Israel) in the vicinity of the archaeological site currently known as Legio (el-Lajjun) near a historical Roman road junction to the south of Tel Megiddo. While archaeological surveys have demonstrated that indeed there was a strong Roman presence at the site, the precise location of the legionary camp has not been demonstrated conclusively. One of the authors (Tepper) has made a topographical and archaeological argument that the low hill, known locally as el-Manach, on the eastern edge of the site is, indeed, the location of the camp. To test this hypothesis, we conducted ground-penetrating radar (GPR) and electromagnetic (EM) archaeogeophysical surveys at the site. In particular, we studied the hypothetical northern corner of the camp in an effort to confirm the presence of archaeological features consistent with Roman military construction. Data from both studies were combined and compared with evidence proffered by Tepper's historical and geographical research. This study provides strong evidence for architectural remains on the hill of el-Manach, and concludes that it is highly likely that such remains relate to the Roman camp of the Sixth Legion. Figure 9. Close up of study area: shaded relief map of el-Manach with 0.42-0.85 m GPR depth slice with anomalies marked A-I (cf. Figure 10). Note the northern linear depression marked with short dashed white lines (M. Adams and J. Pincus). Figure 10. Shaded relief map of el-Manach with two hypothetical reconstructions of the camp based on the GPR and EM data. The smaller option appears in white, with fossae reconstructed in short dashed lines and camp walls in long dashed lines. The larger option appears in white with black extension, with fossae reconstructed in short dashed lines and camp walls in long dashed lines. The location of the western edge and eastern edge is estimated for illustrative purposes only (M. Adams and Y. Tepper).

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Use of Edge Delineating Methods in Interpreting Magnetic Archaeological Prospection Data

Cited by 25 publications

References 44 publications

Raster was Yesterday: Using Vector Engines to Process Geophysical Data

Raster was Yesterday: Using Vector Engines to Process Geophysical Data

High resolution Slovak Bouguer gravity anomaly map and its enhanced derivative transformations: new possibilities for interpretation of anomalous gravity fields

Ground‐penetrating Radar and Electromagnetic Archaeogeophysical Investigations at the Roman Legionary Camp at Legio, Israel

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