Interpolation of the median grain size of the first 2 cm sediment layer in the former saltworks of Salin de Giraud in 2017
Creators
- 1. Lammi Biological Station, Department of Forest Sciences, University of Helsinki, Pääjärventie 320, 16900, Lammi, Finland and University of Angers, France.
- 2. Department of Biology, FI-20014, University of Turku, Finland
- 3. CIMA- Center for Marine and Environmental Research, CTMA- Department of Earth, Environmental and Marine Sciences, Gambelas Campus, University of Algarve 8005-139 Faro, Portugal
- 4. L@bisen, Institut Supérieur de l'Électronique et du Numérique (ISEN), France
- 5. Tour du Valat, France
- 6. Univ Rennes, CNRS, Géosciences Rennes, UMR 6118, 35000 Rennes, France
- 7. Univ Angers, Nantes Université, Le Mans Univ, CNRS, LPG, F-49000 Angers, France
- 8. LETG UMR CNRS 6554, University of Nantes, CEDEX 3, 44312 Nantes, France
Description
Sediment samples were collected in the summer of 2017 over the entire study area at 500 m spacing and in the channels. Grain size analysis of the collected sediment samples was conducted using a Malvern Mastersizer 2000© laser beam grain sizer. The median grain size (d50 in µm) at each sample location was then interpolated over the entire study area. Interpolation was made with the SAGA-GIS software (version 7.9.0). According to the cross-validation error, the best method for the D50mm interpolation was the Modified Quadratic Shepard. The 10-fold validation provided an R² of 0.93, an NMRSE of 24.5, an RMSE of 83.9, an MRE of 7039 with the fit set to “node”, the quadratic neighbours and weighting neighbours set to 50 and the spatial resolution was set to 10 m. The resultant interpolation map was then categorized following the nomenclature of Blott and Pye (2001) provided in the file style_sediment_map.qml.
Files
sediment_median_grain_size.tif
Files
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