[[TranslatedPages]]
= Improve Way Accuracy =
[[Image(source:trunk/images/mapmode/improvewayaccuracy.png)]] ''Keyboard shortcut:'' **{{{W}}}**  — is a one of the [wiki:Help/Modes JOSM modes]

This mode can ''add, move and delete'' '''nodes''' of the previously entered [Help/Concepts/Object ways]; this mode used only to update existing data (ways).

The goal of the mode is to substitute dragging and dropping nodes with clicking to quicken the editing process.

[http://www.youtube.com/watch?v=NzunbvpVIX4 Demonstration video]

== Activation steps ==

Two options:
* Select a way, then [Help/Modes#Activateamode activate a mode as usual]
* Activate a mode, then select a way to update (icon: [[Image(source:trunk/images/cursor/modifier/mode.png,middle,nolink)]])

To start working on a different way without leaving the mode, unselect current way by pressing **{{{Esc}}}** and click on another one.

== Usage ==
[[Image(JOSM-plugin-IWA-example.jpg, right)]]

=== To create new nodes [[Image(source:trunk/images/cursor/modifier/addnode.png,middle,nolink,inline)]] (+{{{Ctrl}}}) ===

A new node will split the segment that is the closest one to the cursor.

=== To move existing nodes ===

Click on the map where you think a node should be. The highlighted (nearest) node will be moved there.

=== To remove nodes [[Image(source:trunk/images/cursor/modifier/delete.png,middle,nolink,inline)]] (+{{{Alt}}}) ===

Press and hold **{{{Alt}}}** or **{{{AltGr}}}** button and click on the map. The highlighted (nearest) node will be deleted. 

Please try to keep as much existing nodes as you can, because thus you keep their history.

=== Lock segment ===

* Lock moved node: [[Image(source:trunk/images/cursor/modifier/lock.png,middle,nolink)]] {{{Shift}}}
* Lock added node: [[Image(source:trunk/images/cursor/modifier/add_node_lock.png,middle,nolink)]] {{{Ctrl}}} {{{Shift}}}

The plugin automatically finds segments and nodes that are the closest to the cursor. However, if you want to get more flexibility, you can **lock the highlighted node/segment** when moving a mouse. Press and hold **{{{Shift}}}** or left mouse button and the focused node or segment will be kept the same no matter where you move the cursor.

== Tips ==
* JOSM has a [[WireframeToggle|wireframe view]] that turns off any styles and makes lines very thin. You can try it by pressing **{{{Ctrl+W}}}** It might be a good idea to toggle that view before improving ways accuracy as it allows to see the imagery below the data layer in a much better way.
* Linux may use the left-ALT key as a mouse modifier, which will annoyingly compel Accuracy mode to use right-Alt to delete nodes. [http://askubuntu.com/questions/118151/how-do-i-disable-window-move-with-alt-left-mouse-button-in-gnome-shell Here is an article] explaining how to reassign that ALT key in Gnome (or MATE), freeing it up for IWAM application usage.  <Super> is "Windows key".
  [[BR]]Alt+F2 → dconf-editor.
  [[BR]]Click through org → gnome → desktop → wm → preferences → mouse-button-modifier → Set it to whichever key you like. e.g. <Super> or <Control><Alt> or <Alt><Super>


== Limitations ==
* **When you add or move nodes, they do not bind to nearby objects** as it happens in the [[Select|Select]] or [[Draw|Draw]] modes. This is not needed during the way shape improvement, but in case you would like to do so, select the nodes in the ''Select'' mode and [[MergeNodes|merge]] them, e.g., by pressing **{{{M}}}**.
* **You cannot delete nodes that are connected to more than one way or that have tags** to prevent accidental breaking of topology or loss of information. Note that "uninteresting" tags are excluded, like FIXME, note, source, etc.

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