ggplot2
SpatialPolygonsDataFrame layer for state of Texas.
spdf_tx
SpatialPolygonsDataFrame
http://colby.edu/~mgimond/Spatial/Data//texas.rds
Converted to sp::CRS("+proj=longlat +datum=WGS84").
sp::CRS("+proj=longlat +datum=WGS84")
https://mgimond.github.io/Spatial/interpolation-in-r.html