Post-process Well-Known Text from Soil Data Access

This is a helper function commonly used with SDA_query to extract WKT (well-known text) representation of geometry to an sf or sp object.

Usage

processSDA_WKT(d, g = "geom", crs = 4326, p4s = NULL, as_sf = TRUE)

d: data.frame returned by SDA_query, containing WKT representation of geometry
g: name of column in d containing WKT geometry
crs: CRS definition (e.g. an EPSG code). Default 4326 for WGS84 Geographic Coordinate System
p4s: Deprecated: PROJ4 CRS definition
as_sf: Return an sf data.frame? If FALSE return a Spatial* object.

An sf object or if as_sf is FALSE a Spatial* object.

The SDA website can be found at https://sdmdataaccess.nrcs.usda.gov. See the SDA Tutorial for detailed examples.

This function requires the sf package.

D.E. Beaudette, A.G. Brown