An indicator widget depicts the state of the value of a certain attribute against a target value. For example, an indicator might depict the average monthly sales for points representing retail outlets against an expected minimum revenue value. For those features where this value falls under the target value, the indicator shows a negative and the value. For those that meet or are above the target value, the indicator shows a positive and the value.
In some cases, the indicator needs to depict the reverse scenario where values above a certain target are shown as negative and below as positive. For example, you can configure an indicator that depicts the temperature reported by a sensor where a negative state is indicated when the temperature rises above a certain level.
The comparison to the target can be one of the following:
You can also configure a three-state indicator widget to depict values above, below, and in between target values.
The target value can be a fixed value, the value of a field for a single feature, or a summary statistic for a field for a collection of features. When a single feature is depicted the feature’s value for the source attribute is considered when compared to the target. If more than one feature is used, such as when there are multiple selected features, a summary operation is performed on the field values and compared against the target. The aggregate can be any one of the following:
In an emergency management scenario following a natural disaster, you could use an indicator widget to depict the average time for police or fire to respond to open incidents. Times less than a certain target threshold—for example, 10 minutes—are shown in green to indicate acceptable values. If the response time rises above the target, the indicator becomes red.