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Akaflieg-Freiburg / enroute

A free navigation app for VFR pilots
https://akaflieg-freiburg.github.io/enroute/
GNU General Public License v3.0
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Own map display is very fuzzy despite mbtiles providing zoom 11-12 level #366

Closed Flying-Roger closed 9 months ago

Flying-Roger commented 10 months ago

Describe the bug Zoom levels above z10 are seemingly ignored by Enroute. Maps using zoom levels 11, 12 becomes very fuzzy when zooming in.

To Reproduce Steps to reproduce the behavior:

  1. Select mbtiles file using only zoom 11 or 12
  2. "Open with" enroute 3 Displayed map is empty or
  3. Select mebtiles files using zooms 8-12
  4. "Open with" enroute
  5. Map is displayed, but becomes very fuzzy when zooming in despite providing zoom 11, 12 in the mbtiles file

Smartphone (please complete the following information):

kebekus commented 10 months ago

@Flying-Roger Understood. I apologize for not being very responsive over the holidays … you know how it is.

Can you give me access to the MBTILES file in question? -- Thanks.

Flying-Roger commented 10 months ago

Hello Stefan,

Thank you for your fast answer.

I detected the fuzzy problem importing a big map prepared with MOBAC. However, I narrowed the search preparing small mbtiles with different zoom level (only one level in each file).

Here is one with only zoom 12.

Kind regards,

Roger

De : Stefan Kebekus Envoyé : samedi 6 janvier 2024 17:17 À : Akaflieg-Freiburg/enroute @.> Cc : Flying-Roger @.>; Mention @.***> Objet : Re: [Akaflieg-Freiburg/enroute] Own map display is very fuzzy despite mbtiles providing zoom 11-12 level (Issue #366)

https://github.com/Flying-Roger @Flying-Roger Understood. I apologize for not being very responsive over the holidays … you know how it is.

Can you give me access to the MBTILES file in question? -- Thanks.

— Reply to this email directly, https://github.com/Akaflieg-Freiburg/enroute/issues/366#issuecomment-1879743102 view it on GitHub, or https://github.com/notifications/unsubscribe-auth/AR2EVJMMC4OZ37QPOZULWETYNF2ITAVCNFSM6AAAAABBPPULJWVHI2DSMVQWIX3LMV43OSLTON2WKQ3PNVWWK3TUHMYTQNZZG42DGMJQGI unsubscribe. You are receiving this because you were mentioned. https://github.com/notifications/beacon/AR2EVJLXC5J3IIWWZ3XV253YNF2ITA5CNFSM6AAAAABBPPULJWWGG33NNVSW45C7OR4XAZNMJFZXG5LFINXW23LFNZ2KUY3PNVWWK3TUL5UWJTTQBKNH4.gif Message ID: < @.> @.>

kebekus commented 10 months ago

@Flying-Roger EMail attachments do not work in GitHub. Please upload the file (the small and the big one) here. Please let me know once you are done, so I can close the upload folder.

Flying-Roger commented 10 months ago

I uploaded the two small examples (z11 and z12), as well as a bigger map (z7-16). You will notice that Enroute only uses z7-10 of the latter, ignoring all deeper zoom levels.

kebekus commented 10 months ago

Files received. Where in all the world are you and what region do these maps cover?

Flying-Roger commented 10 months ago

Oops, sorry. I thought that tiles geolocalisation would allow you to find the area.

The map with zoom level up to 16 is centered on Bütgenbach (Belgium).

N 50:24:54.00 E 006:16:35.00

Kind regards Roger

(Envoyé de mon smartphone)

Le dim. 7 janv. 2024, 14:36, Stefan Kebekus @.***> a écrit :

Files received. Where in all the world are you and what region do these maps cover?

— Reply to this email directly, view it on GitHub https://github.com/Akaflieg-Freiburg/enroute/issues/366#issuecomment-1880062159, or unsubscribe https://github.com/notifications/unsubscribe-auth/AR2EVJLKJMV5MWKNCERLQ5LYNKQFNAVCNFSM6AAAAABBPPULJWVHI2DSMVQWIX3LMV43OSLTON2WKQ3PNVWWK3TUHMYTQOBQGA3DEMJVHE . You are receiving this because you were mentioned.Message ID: @.***>

Flying-Roger commented 10 months ago

I had a look into the source code and found out that min and max zoom levels have to be provided in the metadata. Seemingly mbtiles generated using MOBAC do not contain this information. I have now patched my mbtiles files and the display is no longer fuzzy. Problem solved; maybe a note about mbtiles metadata in the manual would help.

kebekus commented 10 months ago

@Flying-Roger Thank you for the insight, and please apologize for my late answer. I checked the specification document for the MBTILES format today. To my surprise, I found that the metadata fields "minzoom" and "maxzoom" are not mandatory. I will add a workaround code, so Enroute extracts "minzoom" and "maxzoom" values from the "tiles" table if they are not provided explicitly in the file.

Flying-Roger commented 10 months ago

Thank you !

Roger

De : Stefan Kebekus Envoyé : mercredi 24 janvier 2024 07:43 À : Akaflieg-Freiburg/enroute @.> Cc : Flying-Roger @.>; Mention @.***> Objet : Re: [Akaflieg-Freiburg/enroute] Own map display is very fuzzy despite mbtiles providing zoom 11-12 level (Issue #366)

@Flying-Roger https://github.com/Flying-Roger Thank you for the insight, and please apologize for my late answer. I checked the specification document https://github.com/mapbox/mbtiles-spec/blob/master/1.3/spec.md for the MBTILES format today. To my surprise, I found that the metadata fields "minzoom" and "maxzoom" are not mandatory. I will add a workaround code, so Enroute extracts "minzoom" and "maxzoom" values from the "tiles" table if they are not provided explicitly in the file.

— Reply to this email directly, view it on GitHub https://github.com/Akaflieg-Freiburg/enroute/issues/366#issuecomment-1907466853 , or unsubscribe https://github.com/notifications/unsubscribe-auth/AR2EVJMUOMR32D7WCBGLK7LYQCUQHAVCNFSM6AAAAABBPPULJWVHI2DSMVQWIX3LMV43OSLTON2WKQ3PNVWWK3TUHMYTSMBXGQ3DMOBVGM . You are receiving this because you were mentioned. https://github.com/notifications/beacon/AR2EVJJWXM3PUBZX7ZOGKOTYQCUQHA5CNFSM6AAAAABBPPULJWWGG33NNVSW45C7OR4XAZNMJFZXG5LFINXW23LFNZ2KUY3PNVWWK3TUL5UWJTTRWGRGK.gif Message ID: @. @.> >

kebekus commented 9 months ago

(Hopefully) fixed in 2.30.4, which is to appear on Google Play later today.

@Flying-Roger Thank you for your help!