Maps communicate a thousand words. Popups in leaflet help to communicate to the user the information on the map or what each component represents on the map. A more detailed map is better than a less detailed map. Communicating to the user the information on the map should be the key objective of the map maker.
In the Geodjango series, the popups for the incidences and counties layers are displayed to help the user of the map to better understand it. This makes these popups an essential component of web maps.
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Custom Layer Styles
• Geodjango Tutorial 7: Custom Layer Styles
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