Outliers detection

How it works

This tool uses techniques modified from Chapman (1999) to detect outliers in latitude, longitude and altitude. Cut and paste your data into the box in the format cited using either a comma (,) or space ( ) to separate individual fields.

Output

The output will respond with possible suspect records shown in red, both in text and on the accompanying map. Individual records with no suspects occurring in latitude, longitude or altitude will not be shown in text, but are shown in green on the map.

Marine/Terrestrial Feature

Another feature was included to identify possible errors. If the user indicates that the points are 'marine' the system will highlight all points that occur inland.

Reference

"Ref. Chapman, A.D. (1999). Quality control and validation of point-sourced environmental resource data pp.409-418 in Lowell, K. and Jaton, A. (eds). Spatial Accuracy Assessment: Land Information Uncertainty in Natural Resources. Chelsea, Michigan: Ann Arbor Press. 455pp"