Imagery projection problem - WMS endpoint

[nkamapper]

What steps will reproduce the problem?

With the Mercator projection, zoom over the south part of Norway and select the "Kartverket Accessibility" imagery (wms_endpoint), then select any map layer.

What is the expected result?

The chosen WMS map layer should be rendered.

What happens instead?

Projection EPSG:25835 is chosen by JOSM, which only works in the northern part of the country.

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: 2018-03-26 22:16:39 +0200 (Mon, 26 Mar 2018)
Build-Date:2018-03-26 20:45:23
Revision:13576
Redirecting:to URL 'https://josm.openstreetmap.de/svn/trunk':
Relative:URL: ^/trunk

Identification: JOSM/1.5 (13576 nb) Mac OS X 10.13.4
OS Build number: Mac OS X 10.13.4 (17E199)
Memory Usage: 2131 MB / 3641 MB (879 MB allocated, but free)
Java version: 1.8.0_161-b12, Oracle Corporation, Java HotSpot(TM) 64-Bit Server VM
Screen: Display 722476178 3008x1692
Maximum Screen Size: 3008x1692
VM arguments: [-Djava.security.policy=file:<java.home>/lib/security/javaws.policy, -DtrustProxy=true, -Djnlpx.home=<java.home>/bin, -Djava.security.manager, -Djnlpx.origFilenameArg=${HOME}/Library/Application Support/Oracle/Java/Deployment/cache/6.0/56/1ee8cfb8-1cbde886, -Djnlpx.remove=false, -Dsun.awt.warmup=true, -Djava.util.Arrays.useLegacyMergeSort=true, -Dmacosx.jnlpx.dock.name=JOSM, -Dmacosx.jnlpx.dock.icon=${HOME}/Library/Application Support/Oracle/Java/Deployment/cache/6.0/16/47ee53d0-54f0b665.icns, -Djnlp.application.href=https://josm.openstreetmap.de/download/josm.jnlp , -Djnlpx.jvm="<java.home>/bin/java"]

Plugins:
+ apache-commons (34109)
+ changeset-viewer (14)
+ conflation (0.5.7)
+ ejml (34126)
+ geojson (80)
+ geotools (34125)
+ imagery-xml-bounds (34109)
+ jts (34038)
+ opendata (34132)
+ reverter (34109)
+ todo (30303)
+ utilsplugin2 (34109)

Tagging presets:
+ https://josm.openstreetmap.de/josmfile?page=Presets/LaneAttributes&zip=1
+ https://raw.githubusercontent.com/OpenNauticalChart/josm/master/INT-1-preset.xml

Map paint styles:
+ https://josm.openstreetmap.de/josmfile?page=Styles/Lane_and_Road_Attributes&zip=1
- https://raw.githubusercontent.com/OpenSeaMap/josm/master/CEVNI_MapCSS.mapcss
- https://raw.githubusercontent.com/OpenSeaMap/josm/master/INT1_Seamark.mapcss

Last errors/warnings:
- E: 
- E: 
- E: 
- E: 
- E: 
- E: 
- E: 
- E: 
- E: 
- E:

[Don-vip]

We currently choose the first projection:

for (String code : serverProjections) {
    Projection proj = Projections.getProjectionByCode(code);
    if (proj != null) {
        Logging.info(tr("Reprojecting layer {0} from {1} to {2}. For best image quality and performance,"
                + " switch to one of the supported projections: {3}",
                getName(), proj.toCode(), Main.getProjection().toCode(), Utils.join(", ", getNativeProjections())));
        return proj;
    }
}

JOSM needs to be smarter.

[Don-vip]

In 13674/josm:

fix #16219 - smarter selection of WMS projection

[Klumbumbus]

Wouldn't it be even smarter if JOSM checks global projections first and only if there is none available then checks local projections? This would avoid that after adding the imagery you could move the map out of the projection support area.

[Don-vip]

Sure. But the definition of "global" projection is not so easy. The projection areas are usually quite large, so this problem shouldn't occur for real mapping.

[nkamapper]

Would it help if I remove the local UTM projections from https://josm.openstreetmap.de/wiki/Maps/Norway, or are they not used for wms_endpoint?

[Don-vip]

Please keep them. It's up to JOSM to choose the good projection wisely, not to community to restrict the available projections.

[Klumbumbus]

Replying to Don-vip:

Sure. But the definition of "global" projection is not so easy. The projection areas are usually quite large, so this problem shouldn't occur for real mapping.

OK, sounds reasonable.