To solve this problem, we will create a map of the United States of America with a layer of states that drills down to the county level. How then can we organize this information better, especially if we also want to add in another point layer containing airports to help plan how to get to the different sites? It could be made more understandable with better organization, however. When we add the cities that historical sites are located in to a map as a point layer, we get accurate locations for our bubbles. We have a list of all historical sites in the United States National Park Service's National Register of Historic places. This enables you to use display data at different selection levels within your map, ensuring only the most relevant information is being displayed. As users make selections in a layer, the dimension displayed in the layer changes to the next dimension in the drill-down dimension. When creating a map that has multiple points of data located in a wide geographical area, you can use drill-down dimensions to display your layers in a hierarchy. This example will show you how to build a map with a top-level area layer that drills down into with two point layers. Controlling visible map data with drill-down layers ON THIS PAGE
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