Currently the data frame that is passed to usmap_transform must have longitude in the first column and latitude in the second column. It might be more natural to allow columns in any order that have the names lon/long/longitude and lat/latitude.
There can also be two optional parameters to specify the longitude/latitude column names.
For example:
If a data.frame contains columns "x" and "y" instead,usmap_transform(data, longitude_name = "x", latitude_name = "y")
Currently the output data frame contains 4 columns: the two input columns followed by the two output columns. The output columns have the same name as the input columns but with a .1 appended to the end. This does not allow for intuitive use of the function as someone would have to inspect and notice the differences manually.
It might be better include an optional parameter that allows replacement of the input columns (i.e. input data frame has 2 columns named "lon" and "lat", and the output data frame has the same 2 columns, with data transformed). If all 4 columns are to be included in the output, a better convention might be to append _tf or prefix transformed_, etc. (TBD)
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