Current State of Digital Soil Mapping and What Is Next -- Research -- Environmental Covariates for Digital Soil Mapping in the Western USA -- A Generalized Additive Soil Depth Model for a Mountainous Semi-Arid Watershed Based Upon Topographic and Land Cover Attributes -- Applying Geochronology in Predictive Digital Mapping of Soils -- Scale Effects on Terrain Attribute Calculation and Their Use as Environmental Covariates for Digital Soil Mapping -- Conditioned Latin Hypercube Sampling: Optimal Sample Size for Digital Soil Mapping of Arid Rangelands in Utah, USA -- Using Proximal Soil Sensors for Digital Soil Mapping -- The Use of Hyperspectral Imagery for Digital Soil Mapping in Mediterranean Areas -- Automatic Interpretation of Quickbird Imagery for Digital Soil Mapping, North Caspian Region, Russia -- ASTER-Based Vegetation Map to Improve Soil Modeling in Remote Areas -- Digital Soil Boundary Detection Using Quantitative Hydrologic Remote Sensing -- Homosoil, a Methodology for Quantitative Extrapolation of Soil Information Across the Globe -- Artificial Neural Network and Decision Tree in Predictive Soil Mapping of Hoi Num Rin Sub-Watershed, Thailand -- Evaluation of the Transferability of a Knowledge-Based Soil-Landscape Model -- Random Forests Applied as a Soil Spatial Predictive Model in Arid Utah -- Two Methods for Using Legacy Data in Digital Soil Mapping -- Environmental Application and Assessment -- Mapping Heavy Metal Content in Soils with Multi-Kernel SVR and LiDAR Derived Data -- Mapping the CN Ratio of the Forest Litters in Europe-Lessons for Global Digital Soil Mapping -- Spatial Prediction and Uncertainty Assessment of Soil Organic Carbon in Hebei Province, China -- Estimating Soil Organic Matter Content by Regression Kriging -- Digital Soil Mapping of Topsoil Organic Carbon Content of Rio de Janeiro State, Brazil -- Comparing Decision Tree Modeling and Indicator Kriging for Mapping the Extent of Organic Soils in Denmark -- Modeling Wind Erosion Events - Bridging the Gap Between Digital Soil Mapping and Digital Soil Risk Assessment -- Making Digital Soil Mapping Operational -- Soilscapes Basis for Digital Soil Mapping in New Zealand -- Legacy Soil Data Harmonization and Database Development -- Toward Digital Soil Mapping in Canada: Existing Soil Survey Data and Related Expert Knowledge -- Predictive Ecosystem Mapping (PEM) for 8.2 Million ha of Forestland, British Columbia, Canada -- Building Digital Soil Mapping Capacity in the Natural Resources Conservation Service: Mojave Desert Operational Initiative -- A Qualitative Comparison of Conventional Soil Survey and Digital Soil Mapping Approaches -- Applying the Optimum Index Factor to Multiple Data Types in Soil Survey -- U.S. Department of Agriculture (USDA) TEUI Geospatial Toolkit: An Operational Ecosystem Inventory Application -- Predictive Soil Maps Based on Geomorphic Mapping, Remote Sensing, and Soil Databases in the Desert Southwest -- GlobalSoilMap.net - A New Digital Soil Map of the World -- Methodologies for Global Soil Mapping. Digital Soil Mapping is the creation and the population of a geographically referenced soil database. It is generated at a given resolution by using field and laboratory observation methods coupled with environmental data through quantitative relationships. Digital soil mapping is advancing on different fronts at different rates all across the world. This book presents the state-of-the art and explores strategies for bridging research, production, and environmental application of digital soil mapping.It includes examples from North America, South America, Europe, Asia, and Australia. The chapters address the following topics: - exploring new environmental covariates and sampling schemes - using integrated sensors to infer soil properties or status - innovative inference systems predicting soil classes, properties, and estimating their uncertainties - using digital soil mapping and techniques for soil assessment and environmental application - evaluating and using legacy soil data - protocol and capacity building for making digital soil mapping operational around the globe. Key themes: soil science --digital soil mapping - -soil survey and inventory - -soil information -geographic information systems Janis Boettinger is Professor of soil science at Utah State University, engaged in digital soil mapping research and outreach. Alfred E. Hartemink coordinates GlobalSoilMap.net from ISRIC - World Soil Information in The Netherlands. David Howell, Amanda Moore, and Suzann Kienast-Brown are digital soil mapping practitioners in the USA Soil Survey Program.