OpenSatNav

Preload tiles that are on a calculated route.

Bug #579471 reported by chris_debian
8
This bug affects 1 person
Affects Status Importance Assigned to Milestone
OpenSatNav
New
Medium
Unassigned

Bug Description

When a route has been calculated, the user should be given the option to download the maptiles that will be needed, before starting the journey.

This should not contravene any policies in place with the map producer; OSM for example.

Revision history for this message
Aaron Whitehouse (aaron-whitehouse) wrote :

This would not only allow smoother display, but, if you could serach and download before leaving home, you could do so on your home WiFi (which is much cheaper/quicker).

Revision history for this message
chris_debian (cjhandrew) wrote :

I think this may have been discussed before. If I rememder correctly, it contravened the policy of the mapping source.

Not sure whether this is still the case.

Chris.

Revision history for this message
Murphy (murphy2712+launchpad) wrote :

Following OSM's terms:
"Bulk downloading is strongly discouraged. Do not download tiles unnecessarily."

What we want to do here is between a classic usage (download when we need it in real time) and a bulk download (download an entire zone): the tiles we want to preload will be downloaded anyway while driving.

We certainly shouldn't preload all 18-17-16-15(...) zoom levels but do it wisely and preload only the tiles that will be very necessary.

So in order to optimize the preloads, we should resolve:
- issue # 579470 (autozoom following the actual or predicted speed),
- issue # 579472 (display extrapoled tiles on nearby zooms),
before this one.

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