When making choropleth maps you are often required to fill the map using a filling rule that splits the input dataset to a user defined number of ranges. Nevron Map for SSRS supports both two color and three color filling rules with a user specified number of ranges. The dataset is automatically split to the specified ranges according to one of the following distribution rules:

• Equal - also known as quantiles, this method allows for unequally sized data intervals and involves adjustment of the interval limits until an equal number of data points can be slotted into each interval.
• Equal Interval - also known as equal ranges (or steps), this method involves division of the entire data range into equally sized intervals.
• Optimal - adjusts the size of data intervals in order to minimize the classification error and thus the map looks more balanced and the results seem more correct, with just a few shapes in the highest class as one would expect.