no errorr, but question for developer

[thomasmorgenstern@…]

I open shape file in JOSM ====> then save local as myareas.osm. JOSM generete automatic negative node id. This is okay. But by the next session a day later, it uses the same node id. Because the identical node id 's, it is not possible to merge this areas with osmosis. How can I tell to JOSM, which negative node id 's it should use ?

What is the expected result?

What happens instead?

Please provide any additional information below. Attach a screenshot if possible.

URL:https://josm.openstreetmap.de/svn/trunk
Repository:UUID: 0c6e7542-c601-0410-84e7-c038aed88b3b
Last:Changed Date: 2022-04-04 22:26:00 +0200 (Mon, 04 Apr 2022)
Build-Date:2022-04-05 01:30:55
Revision:18427
Relative:URL: ^/trunk

Identification: JOSM/1.5 (18427 de) Windows 7 32-Bit
OS Build number: Windows 7 Professional (7601)
Memory Usage: 133 MB / 247 MB (48 MB allocated, but free)
Java version: 1.8.0_331-b09, Oracle Corporation, Java HotSpot(TM) Client VM
Look and Feel: com.sun.java.swing.plaf.windows.WindowsLookAndFeel
Screen: \Display0 1920×1080 (scaling 1.00×1.00) \Display1 1920×1080 (scaling 1.00×1.00)
Maximum Screen Size: 1920×1080
Best cursor sizes: 16×16→32×32, 32×32→32×32
System property file.encoding: Cp1252
System property sun.jnu.encoding: Cp1252
Locale info: de_DE
Numbers with default locale: 1234567890 -> 1234567890

Plugins:
+ BuildingGeneralization (36)
+ DirectDownload (35951)
+ DirectUpload (35951)
+ HouseNumberTaggingTool (35951)
+ ImproveWay (32)
+ InfoMode (35940)
+ alignways (35951)
+ austriaaddresshelper (1597341117)
+ buildings_tools (35951)
+ colorscheme (35893)
+ continuosDownload (99)
+ dataimport (35932)
+ ejml (35924)
+ jaxb (35952)
+ josm-batch-downloader (1.0.4)
+ log4j (35924)
+ merge-overlap (35893)
+ namemanager (35893)
+ notesolver (0.4.1-2)
+ openvisible (35893)
+ pbf (35893)
+ poly (35893)
+ turnrestrictions (35893)

Tagging presets:
+ https://josm.openstreetmap.de/josmfile?page=Presets/CommonKeyboardShortcuts&zip=1
+ https://josm.openstreetmap.de/josmfile?page=Presets/Heritage&zip=1
+ https://josm.openstreetmap.de/josmfile?page=Presets/LaneAttributes&zip=1
+ https://josm.openstreetmap.de/josmfile?page=Presets/BuildingPreset&zip=1
+ https://josm.openstreetmap.de/josmfile?page=Presets/Historical_Objects&zip=1
+ https://josm.openstreetmap.de/josmfile?page=Presets/MastAndTower&zip=1
+ https://josm.openstreetmap.de/josmfile?page=Presets/ParkingLanes&zip=1
+ https://josm.openstreetmap.de/josmfile?page=Presets/Quick-highways&zip=1
+ https://josm.openstreetmap.de/josmfile?page=Presets/SourceSpain&zip=1
+ https://josm.openstreetmap.de/josmfile?page=Presets/WifiHotspots&zip=1
+ https://josm.openstreetmap.de/josmfile?page=Presets/Windrad&zip=1

Map paint styles:
- https://josm.openstreetmap.de/josmfile?page=Styles/Surface-DataEntry&zip=1
- https://josm.openstreetmap.de/josmfile?page=Styles/ShowID&zip=1
- https://josm.openstreetmap.de/josmfile?page=Styles/ColourGPSData&zip=1
- https://josm.openstreetmap.de/josmfile?page=Styles/Enhanced_Lane_and_Road_Attributes&zip=1
- https://josm.openstreetmap.de/josmfile?page=Styles/MapWithAI&zip=1

[GerdP]

There is no way to tell JOSM what negative ids it should use. You also cannot be sure that it uses the given values when you open an *.osm file that contains negative ids.I don't know why it is done this way.
You should be able to merge layers inside JOSM instead of using osmosis.

[taylor.smock]

Don-vip probably knows more, but I believe we always start numbering negative numbers at -1, and then increment that as new data comes in. If the new data comes in, and has a negative id, we then increment the negative number counter to that negative id - 1. Order matters for this. If we encounter -1000 and then -999, -999 will become -1001. If we then encounter -1001, -1001 should then become -1002.

IIRC, we use a static field to store that negative id counter, so if you load an ordered file with -1000 as the most negative number, and then you load another ordered file with -100 as the most negative number, you will have an object with -1100 instead of -100.

You may want to use ​osmium renumber to renumber the ids, if you really want to use osmosis to merge the files.

[taylor.smock]

@thomasmorgenstern: Do the above responses answer your question?