Regional Soil Mapping Using Multi-Grade Representative Sampling and a Fuzzy Membership-Based Mapping Approach
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A multiple soil properties oriented representative sampling strategy for digital soil mapping
2022, GeodermaCitation Excerpt :Furthermore, Yang et al. (2013) proposed an integrative hierarchical stepwise sampling (IHS) strategy by selecting typical sample points representative of large-scale spatial patterns and local patterns of soil variations successively. It was tested to generate soil maps with higher accuracy than the stratified random sampling (SRS) or cLHS with limited samples at both watershed and regional scales (Yang et al., 2016; Yang et al., 2017). In practice, it is often that the purpose of a soil survey is to map multiple soil properties.
Spatial variability-based sample size allocation for stratified sampling
2021, CatenaCitation Excerpt :We employed the OK method to predict the spatial distribution of SOM content. However, several factors, including climate, terrain, and agricultural activities, can be important factors affecting the spatial distribution of SOM content (Dachraoui and Sombrero, 2020; Yang et al., 2017; Long et al., 2020). Prediction approaches integrating these factors, including regression kriging and multiple linear regression, may further enhance the prediction accuracy.