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Layer List Dialog

Keyboard shortcut: Alt+L

List of currently loaded layers.

Showing and Hiding the Layer List Dialog Window

• Show or hide the Layer List Dialog Window by clicking on in the tool palette on the left of the JOSM main window.
• Show the Layer List Dialog Window by pressing Alt+L.

Layer types

There are different types of layers. Each has a Context Menu accessed from the right mouse button which provides operations on the layer.

• OSM Data Layer (menu): holds the OpenStreetMap data (nodes, ways, relations ...).
• GPX Layer (menu): holds the GPS data loaded from your local hard disk (by using the open dialog to load GPX files) or from openstreetmap. The context menu (right mouse click on layer in layer list) allows to set special properties for different gps layers (different colors, line style, etc.).
• Marker Layer (menu): Markers are specially identified points on the track. They come in four varieties: simple named markers, audio markers, image markers and web markers. They are created as a side effect of opening a GPX file, containing waypoints from that file, or from a set of waypoints artificially constructed using the context menu entry Make Sampled Audio Layer on the GPX layer, which produces only audio markers.
• Photo Layer (menu): the context menu (right mouse) of a GPS layer provides the menu to import images. Using this feature allows to match digital images with the gps coordinates to ease the naming of streets (for example).
• WMS Layer (menu): backgrounds retrieved from a WMS server. You will usually need the appropriate plugins installed to get these. Examples are Landsat satellite imagery, Yahoo satellite imagery, NPE out-of-copyright Ordnance Survey maps and OpenStreetMap map tiles. See also Imagery.
• Validator Layer (menu). See also Validator Dialog

Panel Buttons

The Layer List Dialog also has several buttons at the bottom which operate on the selected layers:

Move Up

Up moves the selected layers up one row in the layer stack.

This is important when items in one layer obscure those in layers below.

Move Down

Down moves the selected layers down one row in the layer stack.

This is important when items in one layer obscure those in layers below.

Activate Layer

Keyboard shortcut: Shift+A+[0-9]

Activate activates the selected layer.

It is only possible to edit in an active Data layer.

Show/Hide Layer

Keyboard shortcut: Shift+S+[0-9]

Show/Hide turns visibility of selected layers on or off.

The layers are unchanged when hidden, but their contents are not shown.

Adjust Opacity

Opacity , once clicked on, offers a bar to adjust the opacity of selected layers in percent. Another click hides the bar again.

Merge Layer

Merge Layer merges the selected layers of the same type.

Duplicate Layer

Duplicate creates a copy of selected layers.

Delete Layer

Delete permanently deletes the selected layers. Cannot be undone !

If you try to delete OSM data layers which contain changes, JOSM will open the Unsaved Changes Dialog, asking to upload and/or save these changes.

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