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How often are The National Map's composite base maps and dynamic service overlays updated?

Composite base maps are recached about once a year. Although data in dynamic service overlays are ideally updated quarterly, it can sometimes take up to six months. Please note that there will be times when composite base maps and dynamic service overlays are not in synchronization because of a difference in refresh cycles.

Subscribe to the National Map Simple Notifcation Service (SNS) to stay in touch with changes to The National Map products.

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