depth-function aggregated mean +- 1 standard deviation

linear model (piece-wise splines), conditioned by clay content, fit + 95% CI

linear model (piece-wise splines) fit + 95% CI

 
Premise
Setting up sampling designs is a non-trivial aspect to any field experiment that includes a spatial component. The sp package for R provides a simple framework for generating point sampling schemes based on region-defining features (lines or polygons) and a sampling type (regular spacing, non-aligned, random, random-stratified, hexagonal grid, etc.). The rgdal package provides a set of functions for importing/exporting common vector data formats. This example demonstrates simple import/export, iterating over sp objects, and reconstituting new objects from lists of objects. A more complex sampling scheme is demonstrated here.

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Site Description:

• Description on the US Forest Service site

illustrating common d-spacings

7 horizons and 5 treatments

 
Premise:

clay vs. depth for 9 pedons