title: When location data is missing in CSV file
body: <p>I have a CSV file with points and their location (in longitude and latitude).
  I notice that some longitude and latitude cells have -99 or -999. I am guessing they are null values?
  I made it into a shapefile but the location is way off because ArcGIS is still reading these -99 and -999 values.
  If I replace these values with &lt;NULL> in the CSV file, would the location of the other values (which are correct) be showing in the right place on the map?</p>
  
  <p>I don't want to delete the records that have these -99 and -999 values although I realize that when a point shapefile is made there is a point (thus, a location) for every record.</p>
  
  <p>I think maybe I could just keep the original CSV file with the -99 and -999 values, make a copy of it, delete these records and make a shapefile out of it (though I have to double check with the person who is also working with me).</p>
  
  <p>Is there another solution though?</p>