WIP to reflect the changes from #8039 (and #10456).

Layers window

Keyboard shortcut: Shift+Alt+L — one of the JOSM windows

The Layers panel lists the loaded layers, controls their visibility and activates them for editing content.

Layer types

JOSM has several types of layers.

• Data layer - Holds a set of map data objects. These can be edited, up- and downloaded unless the layer state is changed or locked. A clock indicates an running upload.
• GPX layer - Holds GPS track data. Each GPX layer can have own properties like color, line style, etc.
• Marker Layer - Holds identified points on a GPX track, called Markers. They are created in four varieties: Named, Audio, Image and Web.
• Geoimage layer - Holds images which were opened, dragged on the Mapview or imported via a GPX layer.
• Imagery Layer - Holds a background retrieved from a tile server like Bing Aerial or other imagery.
• Validator layer - Highlights errors or warnings for objects on the active data layer.
• Notes layer - Holds Notes from ​OSM.

Layers of one type can exist multiple times in a JOSM session, except the validator and the notes layer. More layer types come with additional plugins, e.g. ​Mapillary plugin.

Layer Buttons

	Make this layer the active layer
	Snap/unsnap the map zoom to the native resolution of this background imagery
	Hide/unhide the layer

Panel Buttons

The Layers window 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. You can reorder layers also by drag and drop.

Move Down

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

Activate Layer

Keyboard shortcut: Shift+A⤳[0–9] - counting from the top

Activate activates the selected layer.

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

Visibility

Following hotkeys used to control visibility of top10 or bottom10 layers:

• Shift+S⤳[0–9] - where 0 is the top layer; counting down to 9
• Alt+[1–0] - where 1 is the bottom layer; counting up to 0

Once clicked on, it offers:

• A checkbox to show/hide a layer, i.e. turns visibility of selected layers on or off. The layers are unchanged when hidden, but their contents are not shown. You can also use the following shortcuts to show/hide a layer:
• A slider to adjust the Opacity of selected layers.
• A slider to adjust the Colorfulness of selected layers.
• A slider to adjust the Gamma of selected layers.
• A slider to adjust the Sharpness of selected layers.

Colorfulness, Gamma and Sharpness are only availible for imagery layers.

For gpx layers you can choose one of 7 default colors. (Other colors are available via Customize Color in the gpx layer context menu).

Note: For ease of use you can use mouse scrolling to move a slider while the pointer is placed at the slider – no need to click-drag-release the slider picker.

Delete Layer

Delete permanently deletes the selected layers. All unsaved changes will be discarded!

If you try to delete an OSM data layer or Notes layer which contains changes, JOSM will open the Unsaved Changes window, asking to upload and/or save these changes.

Individual Buttons

There might be more buttons depending on the loaded plugins, e.g. ​RasterFilters plugin.

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