I have a dataset of US intersections from 2011 that I'm going to be using in a project together with data based in WGS84. Included in the CSV file is a variety of fields two of which are the lat and lon. The accompanying documentation makes no mention of the datum that was used for the coordinates. Is there a way to calculate it? If not, because it's US data, would it be safe to assume it's one based on NAD83?
I am going import this into a geography field in SQL Server 2012. I'm guessing that the SRID is either 4269 or 4326. I'd like to be able to determine which it is and transform it if necessary.