Which map gets displayed when multiple offline maps cover the location?

[James]

If I have multiple offline maps which cover the same location, which map gets displayed? Lets say I have a map of Italy with limited zoom.  And I have TWO maps of Naples, each with the same zoom levels but they are different in some respects.  I suspect the map that is displayed is the map that supports the higher zoom level when a higher zoom is used?  But what if multiple maps support the zoom level? Is there any way OSMand can tell me which map I am currently looking at?  Anyway control which of multiple maps has priority?

[Bart Eisenberg]

Which map gets displayed is primarily governed by Configure map > Source map. (You can also specify overlay and underlay maps.) If you zoom far enough back, you see the world overview map.

[Harry van der Wolf]

You are not looking at a map from a file. OsmAnd is reading "map items" from binary files. You are looking at many items in a binary file that are rendered into a map on your screen.

If you have three normal maps covering the same area: one with POIs, one with roads and one with "greenery", the items will be read from all 3 maps (binary files containing "map" items), and all will be displayed on your screen,  sometimes depending on the zoom level.

Another example: all country/region maps have a very limited overlap with the next country/region. On the border "items" from both maps are rendered.

And then you have the options of the "normal" map and the underlay/overlay maps that Bart mentioned.

Harry

Op wo 9 okt. 2019 om 09:24 schreef James <harris...@gmail.com>:

If I have multiple offline maps which cover the same location, which map gets displayed? Lets say I have a map of Italy with limited zoom.  And I have TWO maps of Naples, each with the same zoom levels but they are different in some respects.  I suspect the map that is displayed is the map that supports the higher zoom level when a higher zoom is used?  But what if multiple maps support the zoom level? Is there any way OSMand can tell me which map I am currently looking at?  Anyway control which of multiple maps has priority?

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[James]

I should have been more clear.  Harry, I guess we are using the word "map" differently.  When I say "map" I do not mean an image.  To me "map" means a collection of  data that describes a physical location. SO when I say "looking at a map from a file", to me that means I am looking at the data (or in your words "map items") that has been extracted from that file. I am not using online maps, just offline maps.  So the configuration for setting for online "MapSource" does not apply.  All I have is downloaded maps.  So lets say I will be going to a city for a trip and I obtain maps from different sources.  Each is a complete map with data for POIs, roads, etc.  In some places the maps overlap and in some they do not. But the data could be slightly diffferent because the maps comes from different sources.  In an overlap area, the same POI could be in slightly different locations in the two maps.  If those two maps "are displayed on your screen", I would have a jumbled mess in the overlap area.  For example, that one POI would be displayed at two slightly different locations.  In the overlap area, I want to display one map or the other, not both at the same time.  You are saying that is not possible.  Which is fine if that is how the software work, I just need to know that.  It just means I have to adjust because it is not what I am used to in other various mapping tools I have used.

On Saturday, October 12, 2019 at 1:14:34 AM UTC-4, Bart Eisenberg wrote:

Which map gets displayed is primarily governed by Configure map > Source map. (You can also specify overlay and underlay maps.) If you zoom far enough back, you see the world overview map. 

[Harry van der Wolf]

OK, I understand your purpose and that can be done.

You can activate or deactivate maps. So if you have two comparable maps, but only want to use one of them (for your specific purpose), you simply deactivate the other map.

If you go to your "Download Maps" screen and then to "Installed maps", you can via the "3-dot" menu behind the map, deactivate that map. It will then move completely down in that screen to the "Deactivated maps" section, where you can reactivate it again later when you need that one again.

Harry

Op za 12 okt. 2019 om 14:29 schreef James <harris...@gmail.com>:

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[James]

Thanks for that.  I did see that, but notice I indicated the maps do not cover the exact same area but do have an overlap section.  So by not having both active I would lose some coverage. I guess I am being greedy (but greed based on what other mapping software can do).  As it work, OSMand will still be very useful for me, this is ot a complaint.  Just working up the learning curve of what is possible.

Thanks for everyone's kind help.

On Saturday, October 12, 2019 at 8:47:06 AM UTC-4, Harry van der Wolf wrote

[A Thompson]

If you have multiple active versions of an object having the same ID, then only the most "up to date" one is used as determined by filename sort order. See recent discussions:

https://github.com/osmandapp/Osmand/issues/7562

https://groups.google.com/forum/#!topic/osmand/T0-ddc878Zw