Digital image analysis of outcropping sediments: Comparison to photospectrometric data from Quaternary loess deposits at Şanoviţa (Romania) and Achenheim (France)

Zeeden, Christian; Krauß, Lydia; Kels, Holger; Lehmkuhl, Frank

doi:10.1016/j.quaint.2016.02.047

Cited by 30 publications

(15 citation statements)

References 56 publications

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“…This study illustrates the potential for archive color photographs of terrestrial sediments to be used to extract paleoenvironmental data, even if they do not conform completely to the “best practice” criteria suggested by Zeeden et al (2017). With this in mind, we recommend consideration of six points when assessing archive photographs to extract reflectance data for use in paleoenvironmental reconstructions.…”

Section: Interpretation and Discussionmentioning

confidence: 74%

“…As recommended by Zeeden et al (2017), any photographs used for digital image analysis should (1) have equal light exposure with no shadows, (2) be nondistorted and of a relatively high resolution, and (3) have no discernible differences in moisture content. Although these considerations are important, and certainly should be incorporated into future image analysis experiments, they cannot be applied retrospectively.…”

Section: Methodsmentioning

confidence: 99%

“…Even though the digitization of archive photographs for color/grayscale analyses is not new (summarized in Balsam et al, 1999), few studies have logged color reflectance data from digital images of present-day field sections and compared them against laboratory data. Hitherto, such experiments have been undertaken only on loess (Porter, 2000; Zeeden et al, 2017).…”

Section: Introductionmentioning

confidence: 99%

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Cross correlation of CIELAB color reflectance data from archive photographs and line-scan images of sediment

Murton

Crowhurst

2019

Quat. res.

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Archive color photographs—particularly of sites where sediment is no longer available—are an underused resource that potentially contains detailed paleoenvironmental information. To investigate this potential, two sets of digital images were taken, at different times, of loess, glaciolacustrine, and deep-sea sediments. The first image set was taken using standard digital cameras. Lighting conditions and sediment surface preparation varied, in a similar way to characteristics likely to be encountered in archive photographs. The second image set was taken by a high-resolution, line-scan camera with an integrated light source. CIELAB (Commission Internationale de l'Eclairage) color reflectance data were obtained from both image sets and analyzed by cross correlation. Of the three reflectance parameters (L*, a*, and b*), L* reflectance is the most compromised by differences in ambient lighting or moisture content. Textural distinctions appear to be an important factor influencing the cross correlations and produce multiple, relatively weak solutions for the glaciolacustrine sediments, whereas the texturally uniform loess and deep-sea sediments produce a single, best-fit solution. Comparison of a* reflectance records from an undated marine sequence with a chronologically constrained sequence from the same site indicates the potential to apply color reflectance to produce preliminary age models.

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Section: Interpretation and Discussionmentioning

confidence: 74%

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Cross correlation of CIELAB color reflectance data from archive photographs and line-scan images of sediment

Murton

Crowhurst

2019

Quat. res.

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“…The L*a*b* values indicate the extinction of light, on a scale from L* 0 (absolute black) to L* 100 (absolute white) and express color as chromaticity coordinates on red-green (a*) and blue-yellow (b*) scales. Measured colors were plotted in R using the 'drawProfile.R' script (Sprafke, 2016;Zeeden et al, 2017).…”

Section: Spectrophotometric Analysismentioning

confidence: 99%

The Early Upper Paleolithic Site Crvenka-At, Serbia–The First Aurignacian Lowland Occupation Site in the Southern Carpathian Basin

Nett

Chu

Fischer³

et al. 2021

Front. Earth Sci.

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The Carpathian Basin is a key region for understanding modern human expansion into western Eurasia during the Late Pleistocene because of numerous early hominid fossil find spots. However, the corresponding archeological record remains less understood due to a paucity of well dated, contextualized sites. To help rectify this, we excavated and sampled Crvenka-At (Serbia), one of the largest Upper Paleolithic sites in the region to obtain radiometric ages for the archeological artifacts and evaluate their depositional context and subsequent site formation processes. Our results confirm that this locality represents a multiple-occupation Aurignacian site that dates to 36.4 ± 2.8 ka based on modeling of luminescence ages. Electrical resistivity tomography measurements indicate that the site formed on a sandy-gravelly fill terrace covered by overbank deposits. Complex grain size distributions further suggest site formation in contrasting depositional environments typically occurring alongside fluvial channels, at lakeshores, in alluvial fan or delta settings. The site is thus the closest (ca. 50 km) known Aurignacian site to the earliest undisputed modern human remains in Europe at the Peştera cu oase and some intervals of the occupation may therefore have been contemporaneous with them. This suggests that modern humans, during their initial settlement of Europe, exploited a wider range of topographic and ecological settings than previously posited. Our findings indicate that lowland areas of the Carpathian Basin are an important part of understanding the early settlement patterns of modern humans in Europe.

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“…Application of this model has had a determining influence on the results of numerous recent paleoenvironment reconstructions (e.g. Vlaminck et al, 2016;Zeeden et al, 2016Zeeden et al, , 2017Zeeden et al, , 2018 and paleoclimate models (e.g. PAGES, 2016).…”

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confidence: 99%

The hematite–goethite enhancement model of loess and an ‘irregular’ case from Paks, Hungary

Bradák

Seto

Csonka

et al. 2019

J Quaternary Science

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On the basis of a key model of the appearance of hematite and goethite in some Chinese and European loess successions, paleosols generally contain higher proportions of hematite formed by pedogenic processes during warm and humid interglacials, while loess contains sedimentary goethite deposited during colder, glacial periods. Rock magnetic measurements were conducted on samples from Paks (Hungary) loess, revealing an anomalous case. Sediments were found to contain higher amounts of hematite and/or goethite, while the well‐developed paleosols were found to be lacking in hematite but had significant amounts of magnetite and maghemite. This observation demonstrates that the character of pedogenic magnetic mineral alteration and neoformation differs from the hematite/goethite model; the model is therefore not applicable to the Paks succession, possibly due to differences in the regional paleoclimate and pedogenic environment. The results indicate the existence of a further model, in which hematite formation is not significant in the course of pedogenesis.

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Digital image analysis of outcropping sediments: Comparison to photospectrometric data from Quaternary loess deposits at Şanoviţa (Romania) and Achenheim (France)

Cited by 30 publications

References 56 publications

Cross correlation of CIELAB color reflectance data from archive photographs and line-scan images of sediment

Cross correlation of CIELAB color reflectance data from archive photographs and line-scan images of sediment

The Early Upper Paleolithic Site Crvenka-At, Serbia–The First Aurignacian Lowland Occupation Site in the Southern Carpathian Basin

The hematite–goethite enhancement model of loess and an ‘irregular’ case from Paks, Hungary

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