This function will convert USDA-NCSS horizon boundary topography codes into a vertical offset, suitable for use in
plotSPC. Default values are reasonable starting points for encoding smooth, wavy, irregular, or broken style horizon boundary topography as defined in Field Book for Describing and Sampling Soils, version 3.0.
vector of boundary topography codes to be converted
character vector of topography terms ('smooth') or codes ('S'), case insensitive, see details
vertical offset (depth units) used to create "chevron" effect
vector of vertical offsets with same length as
Additional examples are available in the Visualization of Horizon Boundaries tutorial. Missing data in
x (NA) or codes that are not defined in
codes are returned with an offset of 0.
Either format (or mixture) are accepted, case insensitive:
c('smooth', 'wavy', 'irregular', 'broken')
c('s', 'w', 'i', 'b')