Chapter 8

A DEM -Based Volume Extraction Approach: From Micro-Scale Weathering Forms to Planetary Lava Tubes

Riccardo Pozzobon

Riccardo Pozzobon

Department of Geosciences, University of Padova, Italy

INAF-OAPD, Italy

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Claudio Mazzoli

Claudio Mazzoli

Department of Geosciences, University of Padova, Italy

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Silvia Salvini

Silvia Salvini

Department of Geosciences, University of Padova, Italy

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Francesco Sauro

Francesco Sauro

Department of Biological, Geological and Environmental Sciences, Italian Institute of Speleology, University of Bologna, Italy

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Matteo Massironi

Matteo Massironi

Department of Geosciences, University of Padova, Italy

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Tommaso Santagata

Tommaso Santagata

VIGEA – Virtual Geographic Agency, Italy

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First published: 01 April 2022

Summary

We show how a GIS-based approach on 3D morphologies can be used to analyze volume variations from the microscopic scale on rock samples to large collapse pits on Earth and Mars.

The microscale analyses were performed on scans acquired by a confocal laser scanning microscope from carbonate rock plates dissolved by immersion in slightly acidic solutions. Each studied sample underwent an increasing number of immersions aiming to calculate the recession rate of such stones commonly used in cultural heritage when exposed to acidic rain. We achieved this by creating a synthetic reference surface and calculating the difference in height with the scanned sample surface.

The same approach was applied in planetary remote sensing to evaluate the actual volume of collapsed conduit sections of Earth and Martian lava tubes from DEMs. Lava tubes can be up to tens of kilometers long on Earth and up to hundreds of kilometers on Mars but a numerical estimate of the collapse volumes (and thus of the voids) was never attempted. The creation of a synthetic surface on top of collapses best approximating the pristine topography and calculation of the volumes in between allows comparing the total volume of the collapsed sections in distinct planetary bodies.

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