Preprint Article Version 1 Preserved in Portico This version is not peer-reviewed

Scale-specific Prediction of Topsoil Organic Carbon Contents using Terrain Attributes and SCMaP Soil Reflectance Composites

Version 1 : Received: 14 March 2022 / Approved: 17 March 2022 / Online: 17 March 2022 (11:42:28 CET)

A peer-reviewed article of this Preprint also exists.

Möller, M.; Zepp, S.; Wiesmeier, M.; Gerighausen, H.; Heiden, U. Scale-Specific Prediction of Topsoil Organic Carbon Contents Using Terrain Attributes and SCMaP Soil Reflectance Composites. Remote Sens. 2022, 14, 2295. Möller, M.; Zepp, S.; Wiesmeier, M.; Gerighausen, H.; Heiden, U. Scale-Specific Prediction of Topsoil Organic Carbon Contents Using Terrain Attributes and SCMaP Soil Reflectance Composites. Remote Sens. 2022, 14, 2295.

Journal reference: Remote Sens. 2022, 14, 2295
DOI: 10.3390/rs14102295

Abstract

There is a growing need for an area-wide knowledge of SOC contents in agricultural soils at field scale for food security, monitoring long-term changes related to soil health and climate change. In Germany, large-scale SOC maps are mostly available with a spatial resolution of 250 m to 1 km2. The nationwide availability of both digital elevation models at various spatial resolutions and multi-temporal satellite imagery enables the derivation of multi-scale terrain attributes and Landsat-based multi-temporal soil reflectance composites (SRC) as explanatory variables. On the example of an Bavarian test of about 8000 km2, the scale-specific dependencies between the representativeness of 220 soil samples and different aggregation levels of the explanatory variables were analyzed for their scale-specific predictive power. The aggregation levels were generated by applying a region-growing segmentation procedure, the SOC content prediction was realized by the Random Forest algorithm. In doing so, established approaches of (geographic) object-based image analysis (GEOBIA) and machine learning were combined. The modeling results revealed scale-specific differences. Compared to terrain attributes, the use of SRC parameters lead to a significant model improvement at large field-related scale levels. The joint use of both terrain attributes and SRC parameters resulted in further model improvements. The best modeling variant is characterized by an accuracy of R2=0.84 and RMSE=1.99.

Keywords

soil reflectance composites; digital soil modeling; soil organic carbon; GEOBIA, Landsat; terrain analysis

Subject

EARTH SCIENCES, Geoinformatics

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