e, can be either a data frame or a
simple features (sf) object.  If an sf object is used,
coordinates are extracted from the geometry column in the object, arguments
xcoord and ycoord are assigned values "xcoord" and
"ycoord", respectively, and the geometry column is dropped from the
object.'><meta property="og:image" content="https://usepa.github.io/spsurvey/logo.png"><!-- mathjax --><script src="https://cdnjs.cloudflare.com/ajax/libs/mathjax/2.7.5/MathJax.js" integrity="sha256-nvJJv9wWKEm88qvoQl9ekL2J+k/R