[[TranslatedPages]]

= Map view in JOSM =

This is the main view in JOSM (also called [https://en.wikipedia.org/wiki/Viewport Viewport]), where editing takes place, and Bing/Mapbox and other sources can be displayed.

[[Image(Help/MapView:MapView2.png,500,nolink)]]

=== What do you see here and when ===

There are several mechanisms in JOSM that affect what the user sees in the map view.

==== Visibility ====

* Data can be ''filtered out'' by [wikitr:/Help/Dialog/Filter Filters]
* [wikitr:/Help/Dialog/LayerList Layers (data, imagery)]
 * can be [wikitr:/Help/Dialog/LayerList#LayerButtons hidden] or can be set to [wikitr:/Help/Dialog/LayerList#VisibilityLayer semi-opaque]
 * can be obscured by other data layers ([wikitr:/Help/Dialog/LayerList#PanelButtons Up/Down buttons] are used to arrange layers)
* Map Paint Styles can hide OSM objects per zoom level

==== Appearance ====

* '''Partial fill of objects''' is enabled by default, it '''depends on area of the object'''. Areas will be fully filled if ''the partial fill would cover more than 50% of the area'' to avoid small unfilled gaps in the middle of an area.
* Enabled (in [wikitr:/Help/Preferences/Map#MapPaintStyles preferences]) and activated (in [wikitr:/Help/Dialog/MapPaint Map Paint Styles window] or preferences) styles affect what you see on the screen
* Styles can be displayed differently based on zoom factor

=== Map view controls ===

==== Move map ====

The area can be moved by '''holding down''' the {{{right mouse button}}}, and '''dragging''' the mouse. To improve dragging performance, labels are hidden while moving the map:

[[Image(Help/MapView:labels_hiding.gif,500)]]

==== Zoom ====

* Using the scroll wheel
* {{{+}}} and {{{-}}} keys 
* more specialized move/zoom actions and tools like:
 * several entries in the [wikitr:/Help/Menu/View View menu]
 * [wikitr:/Help/Action/JumpToPosition Jump To Position]
 * [wikitr:/Help/Action/Zoom Zoom tool]
 * [wikitr:/Help/Dialog/Minimap Minimap]

== Downloaded area ==

Indicated by yellow reverse diagonals.

JOSM will limit your editing abilities outside of the area that you have downloaded, because it may lead to [wikitr:/Help/Concepts/Conflict conflict] after upload.

Another precaution is not to draw new objects in undownloaded area because it may lead to duplicates (because of not-downloaded-yet and not visible objects in your viewport).

== Troubleshooting ==
=== MacOS ===
On a Mac with a one-button mouse, simulate right-click by holding down {{{Ctrl}}} while clicking the button.

== See also ==
* '''[wikitr:Action/Select Select Action]''' - help on selecting, moving, and rotating objects in the map view
* '''[wikitr:/Help/EditToolbar Modes]''' - overview of modes (frequently accessed tools) in JOSM
* [wikitr:/Help/StatusBar Status bar]
* [wikitr:/Help/Menu/ImageryContextMenu Imagery Context Menu]
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