Digital Elevation Models (DEMs) after the Shovi (Caucasus) debris flow, 13 August 2023

<p>===========================</p> <p>Introduction</p> <p>On 4 August 2023, a large debris flow struck the mountain resort town of Shovi in Georgia. More on this event here&nbsp;: <a href="https://eos.org/thelandslideblog/the-4-august-2023-debris-flow-at-shovi-in-georgia">https://eos.org/thelandslideblog/the-4-august-2023-debris-flow-at-shovi-in-georgia</a></p> <p>Two Pl&eacute;iades stereo images were acquired after the event on 13 August 2023, thanks to the activation of the CIEST&sup2; (<a href="https://www.poleterresolide.fr/ciest-2-nouvelle-generation-2/">https://www.poleterresolide.fr/ciest-2-nouvelle-generation-2/</a>) scheme.&nbsp;2023-08-13a covers the lower part,&nbsp;2023-08-13b the upper/source area.</p> <p>We share here the Pl&eacute;iades DEMs derived from these images. The collection includes four files:</p> <p>Shovi_2023-08-13a_DEM_2m.tif</p> <p>Shovi_2023-08-13a_DEM_20m.tif</p> <p>Shovi_2023-08-13b_DEM_2m.tif</p> <p>Shovi_2023-08-13b_DEM_20m.tif</p> <p>&nbsp;</p> <p>===========================</p> <p>Methods</p> <p>The Pl&eacute;iades stereo-images were processed using the Ames Stereo Pipeline (ASP, Beyer et al., 2018), yielding a DEM in 2x2m and 20x20 m GSD and an orthoimage in 0.5x0.5m GSD. The processing was done using as only input the stereo-images and their orientation information, as Rational Polynomial Coefficients (RPCs). The parallel_stereo routine performs all the steps needed in the correlation of the stereo-images, yielding a pointcloud which is then interpolated using the routine point2dem. We used the block matching algorithm and the set of processing parameters from Marti et al. (2016)</p> <p>Beyer, R. A., Alexandrov, O., and McMichael, S.: The Ames Stereo Pipeline: NASA&rsquo;s Open Source Software for Deriving and Processing Terrain Data, Earth and Space Science, 5, 537&ndash;548, https://doi.org/10.1029/2018EA000409, 2018.</p> <p>Marti, R. et al.: Mapping snow depth in open alpine terrain from stereo satellite imagery, The Cryosphere, 10(4), 1361&ndash;1380, doi:10.5194/tc-10-1361-2016, 2016.</p> <p>&nbsp;</p> <p>===========================</p> <p>Data Specifications:</p> <p>Cartographic projection: UTM zone 38N (EPSG:32638)</p> <p>Origin of Elevation: meters above WGS84 ellipsoid</p> <p>Raster data format: GeoTIFF</p> <p>NoData value&nbsp;: -9999</p> <p>Pl&eacute;iades dataset includes only DEMs because a licence needs to be signed with CNES to access Pl&eacute;iades imagery. Please contact the authors for further information on this.</p> <p>&nbsp;</p> <p>===========================</p> <p>Acknowledgements:</p> <p>Pl&eacute;iades images were provided under the CIEST&sup2; initiative (CIEST2 is part of ForM@Ter (https://en.poleterresolide.fr/) (Pl&eacute;iades &copy; CNES 2023, distribution AIRBUS DS)</p> <p>&nbsp;</p> <p>===========================</p> <p>Dataset Attribution:</p> <p>This dataset is licensed under a Creative Commons CC BY-NC 4.0 International License (Attribution-NonCommercial).</p> <p>&nbsp;</p> <p>===========================</p> <p>Citation:</p> <p>Please cite this repository as :</p> <p>Berthier E.&nbsp;(2023). Digital Elevation Models (DEMs) after the Shovi flood (Caucasus), 13 August 2023,&nbsp;Dataset distributed on Zenodo: 10.5281/zenodo.8252339</p>