Sometimes the data used to generate maps is incorrect. This may be because:

  • location data transcribed from a specimen label is too general to be converted into a latitude and longitude, eg what is the latitude and longitude of the location ‘Atherton Tableland’?
  • the coordinates provided are too coarse, eg whole degrees rather than to three decimal places.
  • the coordinates have been incorectly recorded or transcribed.

At other times the location is correct and the specimen was found in, eg a botanic garden, a reptile park or supermarket (especially with insects, frogs and other small creatures). In some cases, these ‘outliers’ can in fact be real extensions to the range of the species. All related information to the occurrence needs to be examined to see if it is an error of some type or a genuine observation.