KML documents and KMZ archives may be shared by e-mail, hosted locally for sharing within a private internet, or hosted on a web server.” KML documents and their related images (if any) may be compressed using the ZIP format into KMZ archives. Organizations such as National Geographic, UNESCO, and the Smithsonian have all used KML to display their rich sets of global data. Students and teachers use KML to explore people, places, and events, both historic and current. Real estate professionals, architects, and city development agencies use KML to propose construction and visualize plans. Scientists use KML to provide detailed mappings of resources, models, and trends such as volcanic eruptions, weather patterns, earthquake activity, and mineral deposits. Casual users create KML Placemarks to identify their homes, describe journeys, and plan cross-country hikes and cycling adventures. KML uses a tag-based structure with nested elements and attributes and is based on the XML standard. Put simply: KML encodes what to show in an earth browser, and how to show it. “KML is an XML grammar used to encode and transport representations of geographic data for display in an earth browser.
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