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= Layer List Dialog =

[[Image(source:trunk/images/dialogs/layerlist.png)]] ''Keyboard shortcut'': **{{{Shift+Alt+L}}}**

**List of currently loaded layers.**

[[Image(LayerList.png)]]

== Showing and Hiding the Layer List Dialog Window ==
 * Show or hide the Layer List Dialog Window by clicking on [[Image(source:trunk/images/dialogs/layerlist.png,20)]] in the tool palette on the left of the JOSM main window. 
 * Show the Layer List Dialog Window by pressing **{{{Shift+Alt+L}}}**.
 * Use the [wiki:Help/ToggleDialogs Windows menu].

== 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.

 * [[Image(source:trunk/images/layer/osmdata_small.png)]] **OSM Data** Layer [wiki:Help/Menu/OSMLayer (menu)]: holds the OpenStreetMap data (nodes, ways, relations).
 * [[Image(source:trunk/images/layer/gpx_small.png)]] **GPX** Layer [wiki:Help/Menu/GPXLayer (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.).
 * [[Image(source:trunk/images/layer/marker_small.png)]] **Marker** Layer [wiki:Help/Menu/Marker (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.
 * [[Image(source:trunk/images/dialogs/geoimage.png,15)]] **Photo** Layer [wiki:Help/Menu/PhotoLayer (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). 
 * [[Image(source:trunk/images/imagery_small.png)]] **Imagery** Layer [wiki:Help/Menu/ImageryContextMenu (menu)]: backgrounds retrieved from a WMS, TMS or WMTS server. Examples are Landsat satellite imagery, Bing Aerial, NPE out-of-copyright Ordnance Survey maps and OpenStreetMap map tiles. See also [wiki:Help/Menu/Imagery Imagery].
 * [[Image(source:trunk/images/layer/validator_small.png)]] **Validator** Layer [wiki:Help/Menu/Validator (menu)]: highlights objects with errors or warnings from the [wiki:Help/Dialog/Validator Validator]
 * [[Image(source:trunk/images/dialogs/notes/note_open.png,15)]] **Notes** Layer [wiki:Help/Menu/Notes (menu)]: displays the position of downloaded [wiki:Help/Dialog/Notes Notes] in the Map view.


== Layer Buttons ==

* [[Image(source:trunk/images/dialogs/layerlist/active.png)]] click to make the layer the active layer
* [[Image(source:trunk/images/dialogs/layerlist/scale.svg,16)]] click to snap/unsnap the zoom to native resolutions of this background imagery layer
* [[Image(source:trunk/images/dialogs/layerlist/eye.png)]] click to hide/unhide the layer


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

=== Move Up === #LayerUp
[[Image(source:trunk/images/dialogs/up.png)]] **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 === #LayerDown
[[Image(source:trunk/images/dialogs/down.png)]] **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 === #ActivateLayer
[[Image(source:trunk/images/dialogs/activate.svg)]]  ''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 === #ShowHideLayer
[[Image(source:trunk/images/dialogs/showhide.png)]] ''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 === #OpacityLayer
[[Image(source:trunk/images/dialogs/layerlist/transparency.png)]] **Opacity** , once clicked on, offers a bar to adjust the opacity of selected layers in percent. Another click hides the bar again. 

=== Adjust Gamma === #GammaLayer
[[Image(source:trunk/images/dialogs/layerlist/gamma.png)]] **Gamma** , once clicked on, offers a bar to adjust the gamma value of selected layers. Another click hides the bar again. This feature is only availible for imagery layers.

=== Delete Layer === #DeleteLayer
[[Image(source:trunk/images/dialogs/delete.png)]] **Delete** permanently deletes the selected layers. **Cannot be undone ! **
 If you try to delete OSM data layers which contain changes, JOSM will open the [wiki:Help/Dialog/UnsavedChangesDialog Unsaved Changes Dialog], asking to upload and/or save these changes.

=== Individual Buttons ===
There might be more buttons depending on the loaded [wiki:/Plugins plugins], e.g. [osmwiki:JOSM/Plugins/RasterFilters RasterFilters plugin].
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