Summary  
This chapter demonstrates how to create filtered aggregate measures using DAX functions like CALCULATE and SUM to isolate data subsets and enrich visuals with customized tooltips.  

General domain of usage  
Interactive data visualization

Explore how to use different **map types** in Power BI and enhance them with informative **tooltips**. You will learn to add and configure map visuals, customize tooltips by adding extra fields and formatting, and even design dedicated tooltip pages for deeper insights.

Using your DAX knowledge, you can apply functions like `CALCULATE` and `SUM` to isolate specific rider types and enrich your map tooltips with meaningful data:

```DAX
Registered Riders State =
CALCULATE(
    SUM(bike_riders_data_by_state[riders]),
    bike_riders_data_by_state[rider_type] = "Registered"
)
```

```DAX
Casual Riders State =
CALCULATE(
    SUM(bike_riders_data_by_state[riders]),
    bike_riders_data_by_state[rider_type] = "Casual"
)
```

Here is the dataset you will use:

What feature allows you to display additional data when hovering over a map visual?

Map and Tool Tips