USDA soil texture class polygon vertices — usda_texture

A tidy data frame containing the polygon vertex coordinates for each of the 12 USDA soil texture classes, suitable for drawing a texture triangle with gg_texture_triangle() and for point-in-polygon classification with classify_texture().

Usage

usda_texture_classes

Format

A tibble with 58 rows and 6 columns:

class: Full texture class name (e.g. "clay loam").
abbr: Short abbreviation (e.g. "ClLo").
vertex_order: Integer giving the order of the vertex within the polygon.
sand: Sand percentage at this vertex.
silt: Silt percentage at this vertex.
clay: Clay percentage at this vertex.

Source

Extracted from the soiltexture package (TT.classes.tbl() / TT.vertices.tbl(), system "USDA.TT"). See data-raw/usda_texture_classes.R for the preparation script.

Details

Polygon vertices are listed in order around each polygon. Sand, silt, and clay values are in percent (0–100) and sum to 100 per vertex.