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I updated some roads in osm map. I updated using JOSM. But the updates are not visible in the map after 2 days. I am new to osm maps. Can anyone please tell me the possible reasons.

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Check here an you can view your changesets - – Mapperz Aug 9 '12 at 13:52
up vote 2 down vote accepted

Generally, your edits will appear on the default mapnik layer on within several minutes or hours.

However, there's a few reasons why your edits haven't appeared: - the tags that you used are incorrect; some obscurer features (for example, a power generator) don't render (appear) on the default mapnik later used on

This QandA discusses these reasons and others more in-depth.

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