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Standard methods of feature classification  

28/2/2014

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Desktop GIS software such as ArcGIS, MapInfo and QGIS offer a number of classification methods. The most commonly featured are Natural Breaks (Jenks), Equal Interval, Quantile, Standard Deviation and Manual.
Natural Breaks was developed by George Jenks. This method uses clusters and gaps in the data to create classes.
Natural Breaks (Jenks)
Equal Interval, as it name indicates, creates classes which are of equal value ranges. For example if the value is between 1 and 100 and the number of classes is five, this method creates classes from 1-20, 21-40, 41-60, 61-80 and 81-100.
Equal Interval Example
Quantile will create an equal number of features for each class in this method. For instance if you have a 100 features and four classes then each class will contain 25 features.



Quantile (Equal Count) Example
Standard deviation will create classes based on a specific number of standard deviations from a mean value.
Standard deviation example
Finally if you decide to use a manual method you set you own class breaks according to your requirements.

If you would like to further explore how GIS could help your organisation jps services offers one and two day training courses in QGIS, ArcGIS and MapInfo.




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    Author

    Joe Short BSc has been involved with various mapping solutions for over twenty years.  If you are considering implementing a GIS  or have ArcGIS Pro, MapInfo Pro or QGIS training requirements, jps services would be happy to be of assistance to your organisation. 

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