To ensure symbols are consistent as you pan, zoom, and filter the map, quantitative data driven styling uses {ref}/search-aggregations-metrics-extendedstats-aggregation.html[extended_stats aggregation] to retrieve statistical metadata. Extended_stats is not available for numeric property values from the <<maps-aggregations, metric aggregations>> count, sum, and unique count.
To configure extended_stats, click the gear icon image:maps/images/gear_icon.png[]. Set *Sigma* to a smaller value to minimize outliers by moving the range minimum and maximum closer to the average. Clear the *Calculate range from indices* checkbox to turn off the extended_stats aggregation request. The gear icon is not available for numeric property values from the <<maps-aggregations, metric aggregations>> count, sum, and unique count.
NOTE: When extended_stats is not used, symbols might be inconsistent as users pan, zoom, and filter the map. Without extended_stats, the range is calculated with data from the local layer. The range is re-calculated when layer data changes.
To ensure symbols are consistent as you pan, zoom, and filter the map, qualitative data driven styling uses a {ref}/search-aggregations-bucket-terms-aggregation.html[terms aggregation]. The term aggregation retrieves the top nine categories for the property. Feature values within the top categories are assigned a unique style. Feature values outside of the top categories are grouped into the *Other* category. A feature is assigned the *Other* category when the property value is undefined.
To configure the terms aggregation, click the gear icon image:maps/images/gear_icon.png[]. Clear the *Get categories from indice* checkbox to turn off the terms aggregation request.
NOTE: When the terms aggregation is not used, symbols might be inconsistent as users pan, zoom, and filter the map. Without terms aggregation, the top categories are calculated with data from the local layer. The top categories are re-calculated when layer data changes.
Class styling symbolizes features by class and requires multiple layers.
Use <<maps-layer-based-filtering, layer filtering>> to define the class for each layer, and <<maps-vector-style-static, static styling>> to symbolize each class.