How to cache Google map tiles for offline usage?
Like Nokia's OVI maps can be used offline, there must be some way of caching Google map tiles too. Any hints?
If you are trying to cache the tiles that Google serves, that may be a violation of Google's Terms of Service (unless, under certain circumstances, if you've purchased their enterprise Maps API Premier). That's why gmapcatcher has it crossed off their list. See http://code.google.com/p/gmapcatcher/issues/detail?id=210.
At the gmapcatcher URL above, you will also find a shell script that can download tiles (or so its author says).
There are also other projects that try to make Google Maps available offline:
http://code.google.com/p/ogmaps/
http://code.google.com/p/gmapoffline/
Lastly, if Google Earth can meet your needs, then you can use that. Offline usage of Google Earth requires a Google Earth Enterprise license according to http://www.google.com/permissions/geoguidelines.html.
Note that the preceding page also says: "You may not scrape or otherwise export Content from Google Maps or Earth or save it for offline use." So if you try to cache tiles, that will almost certainly be considered (by Google, anyway) a violation of the Terms of Service.
Unfortunately, I found this link which appears to indicate that we cannot cache these locally, therefore making this question moot.
http://support.google.com/enterprise/doc/gme/terms/maps_purchase_agreement.html
4.4 Cache Restrictions. Customer may not pre-fetch, retrieve, cache , index, or store any Content, or portion of the Services with the exception being Customer may store limited amounts of Content solely to improve the performance of the Customer Implementation due to network latency, and only if Customer does so temporarily, securely, and in a manner that (a) does not permit use of the Content outside of the Services; (b) is session-based only (once the browser is closed, any additional storage is prohibited); (c) does not manipulate or aggregate any Content or portion of the Services; (d) does not prevent Google from accurately tracking Page Views; and (e) does not modify or adjust attribution in any way.
So it appears we cannot use Google map tiles offline, legally.
update:
I found the terms of use from Google Map:
Section 10.5
No caching or storage. You will not pre-fetch, cache, index, or store any Content to be used outside the Service, except that you may store limited amounts of Content solely for the purpose of improving the performance of your Maps API Implementation due to network latency (and not for the purpose of preventing Google from accurately tracking usage), and only if such storage: is temporary (and in no event more than 30 calendar days); is secure; does not manipulate or aggregate any part of the Content or Service; and does not modify attribution in any way.
It means we can cache for limited time actually
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