Regionwide offline map updated later than region

[Evgeny Seliverstov]

Hello!

I noticed a strange behavior. Per-region offline maps are updated usually on first day of the month. But the regionwide map can lag

much longer. For example, Belgium Standard map today (10 Dec) is on 1 Nov 2019 while the Flanders region is by 1 Dec so it is a ten day lag.

To be totally sure, I checked the downloaded index json and it says the same information as in Downloads dialog:

  <region type="map" date="01.11.2019" size="408.3"
targetsize="681.1" containerSize="428172422" contentSize="714232579"
description="Map, Roads, POI, Transport, Address data for Belgium
europe" name="Belgium_europe_2.obf.zip" timestamp="1572566400000"/>

 <region
 type="map" date="01.12.2019" size="270.7" targetsize="457.7"
containerSize="283837691" contentSize="479946989" description="Map,
Roads, POI, Transport, Address data for Belgium flanders europe"
name="Belgium_flanders_europe_2.obf.zip" timestamp="1575158400000"/>

Index on https://download.osmand.net/list.php says the same.

Is it a bug on the server?

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Best regards,

Evgeny

[Harry van der Wolf]

I assume it has to do with size. A map twice as large takes 2-4 times the time to generate, and this works almost exponentially. I guess a map 4 times as big, takes 8-10 times as long to generate. I generated a lot of local maps in the past.

Belgium is a relatively small map, but when looking at Germany, France, Unites States, Russia, etc. there is a huge overhead.

Most users will not use the entire map, because it does not even exist for these big countries, but a few (or more) regions. That is why regions are generated first.

And when that is done, the slow complete country maps are generated. For the Netherlands it is the same, and Italy as well, which is a "middle sized" country.

Harry.

Op di 10 dec. 2019 om 08:08 schreef Evgeny Seliverstov <the...@gmail.com>:

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[Evgeny Seliverstov]

Thanks, got it. Did not thought about non-linear generate performance.

If I download all per-region maps, is it equivalent to downloading the regionwide map? I mean all the information (poi, tiles) is present and there are no gaps.

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[Harry van der Wolf]

Op di 10 dec. 2019 om 08:39 schreef Evgeny Seliverstov <the...@gmail.com>:

Thanks, got it. Did not thought about non-linear generate performance.

If I download all per-region maps, is it equivalent to downloading the regionwide map? I mean all the information (poi, tiles) is present and there are no gaps.

Yes, it is. All data is covered in this regional maps as well. Please note that that if a country wide map is 1GB (for example), the combined regions are slightly bigger like 1.2GB or so.

There is some overhead in the files and a very small portion of redundancy, especially in case of larger, complex map objects that cross boundaries.

Harry