Local modification of map does not work as expected

[wega789]

Hi,
I try to change the appearance of some ways on OsmAnd maps. The reason is I want to highlight or downgrade them according to my own cycling experience. If a track is cyclable depends e.g. on gravel size and personal fitness and the assigned tags mostly do not reflect this. Furthermore cycleways along roads are not easily recognizable. I know that I might also have to write a custom render.xml. For testing purposes I also changed the path of ways.

So far I generated a difference obf file by using the MainUtilities class with generate-obf-diff argument. When I transfer the generated obf to my smartphone and deactivate the standard map, I see all modified ways in their new position and new appearance. So far so good. But when I then activate the standard map again the way is shown in its old and new position and its new appearance is hidden by the old one. What am I missing to hide superceded data of the standard map?

By using binary inspector I think the contents of the generated obf is plausibe. Ways with moved nodes are there twice: One with tag "osmand_change=deleted" and one with the new nodes and properties. Both have the same "original_id" (OSM Id) as the original way in the standard map (but different "way ids"). Ways with only changed tags are there only once with same "original_id" and their new properties. So all information is there to prevent OsmAnd from drawing the deprecated ways. After reading discussions on file sort order I tried all kind of name variations for the difference file, e.g. adding "1", "_1", "_2025_09_02" before the .obf. To be on the safe side I stopped OsmAnd before changing the maps. The maps are in the Android/data/net.osmand.plus/files folder. What am I doing wrong?

Thank you for help.

[vshcherb]

Some thoughts regarding your topic

• Generate obf diff only works for small files, so you won't be able to generate diff file with large files.
• Naming of files matters but it's might be not the reason, even if you name original map "A.obf" and diff "Z.obf" file it should work. Z comes after A, and objects from Z should hide objects from A as they have the same id
• OsmAnd uses osmand_id that encodes additional data comparing osm_id. Id includes geometry and location of the object.
  Way types [natural-coastline (1)] id 769717340475766206 osmid 6013416722466923
• If you map doesn't have large id then it won't be able to "move objects". Each tile is loaded and rendered separately, so for changed geometry you should always see in inspector 2 objects "deleted" (with old geometry point location) and "added" (at new location). If you don't see deleted object at old place, you will see bugs like double roads.