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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<title>GRASS GIS Manual: wxGUI.Vector_Digitizer</title>
<meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1">
<link rel="stylesheet" href="grassdocs.css" type="text/css">
</head>
<body bgcolor="white">
<img src="grass_logo.png" alt="GRASS logo"><hr align=center size=6 noshade>
<h2>NAME</h2>
<em><b>wxGUI.Vector_Digitizer</b></em>
<h2>DESCRIPTION</h2>
The <b>vector digitizer</b> is
a <em><a href="wxGUI.html">wxGUI</a></em> component intended for
interactive editing vector maps
(see <em><a href="v.edit.html">v.edit</a></em> for non-interactive
vector editing GRASS capabilities).
<p>
The digitizer supports editing of 2D vector features (points, lines, centroids,
boundaries, and area).
Vector features can be selected using mouse or by query (e.g. minimal
vector line length). Vector features can be selected by bounding box
or simply by mouse click (based on 'Settings->General->Select
threshold' value).
<p>
Vector digitizer can be activated from Main toolbar in Map Display by
selecting "Digitize" from "Tools" combobox. Vector map to be edited
can be afterwards selected from digitizer toolbar ("Select vector map"
combobox, note that only vector maps from the current layer tree in Layer
Manager are available).
Vector digitizer can be alternatively also activated from contextual
menu in Layer Manager by selecting "Start editing" on selected vector
map in the layer tree.
<p>
New vector map can be easily created from digitizer toolbar by
selecting "New vector map" in "Select vector map" combobox. A new
vector map is created, added to the current layer tree in Layer
Manager and opened for editing. "Select vector map" combobox in
digitizer toolbar also allows switching easily between vector maps to be
edited.
<p>
The wxGUI vector digitizer draws all maps in the Layer Manager in the Map
Display window; in addition, the digitizer also recognizes a special
"background" vector map. This map is selected from the Layer Manager by
right-clicking on the map and selecting "Use as Background Map" from the
contextual menu. The features of the background map may then be copied into
the currently edited vector map using the "Copy features from (background)
vector map" button in the "Additional Tools" menu on the Digitzer Toolbar.
<h3>DIGITIZER TOOLBAR</h3>
<center>
<br><img src="wxGUI_vector_digitizer_toolbar.jpg" border="1"><br><br>
</center>
<dl>
<dt><img src="icons/point-create.png">
<em>Digitize new point</em></dt>
<dd>Add new point to vector map and optionally define its
attributes.</dd>
<dt><img src="icons/line-create.png">
<em>Digitize new line</em></dt>
<dd>Add new line to vector map and optionally define its
attributes.</dd>
<dt><img src="icons/boundary-create.png">
<em>Digitize new boundary</em></dt>
<dd>Add new boundary to vector map and optionally define its
attributes.</dd>
<dt><img src="icons/centroid-create.png">
<em>Digitize new centroid</em></dt>
<dd>Add new centroid to vector map and optionally define its
attributes.</dd>
<dt><img src="icons/polygon-create.png">
<em>Digitize new area</em></dt>
<dd>Add new area (closed boundary and one centroid inside) to vector
map and optionally define its attributes.</dd>
<dt><img src="icons/vertex-move.png">
<em>Move vertex</em></dt>
<dd>Move selected vertex of linear feature. Thus shape of linear
feature is changed.</dd>
<dt><img src="icons/vertex-create.png">
<em>Add vertex</em></dt>
<dd>Add new vertex to selected linear feature (shape not
changed).</dd>
<dt><img src="icons/vertex-delete.png">
<em>Remove vertex</em></dt>
<dd>Remove selected vertex from linear feature. Thus shape of selected
feature can be changed.</dd>
<dt><img src="icons/line-edit.png">
<em>Edit line/boundary</em></dt>
<dd>Edit selected linear feature, add new segments or remove
existing segments of linear feature.</dd>
<dt><img src="icons/line-move.png">
<em>Move feature(s)</em></dt>
<dd>Move selected vector features. Selection can be done by mouse or
by query.</dd>
<dt><img src="icons/line-delete.png">
<em>Delete feature(s)</em></dt>
<dd>Delete selected vector features (point, line, centroid, or
boundary). Selection can be done by mouse or by query.</dd>
<dt><img src="icons/cats-display.png">
<em>Display/update categories</em></dt>
<dd>Display categories of selected vector feature. Category settings
can be modified, new layer/category pairs added or already defined pairs
removed.</dd>
<dt><img src="icons/attributes-display.png">
<em>Display/update attributes</em></dt>
<dd>Display attributes of selected vector feature (based on its
category settings). Attributes can be also modified. Same
functionality is accessible from Main toolbar "Query vector map
(editable mode)".</dd>
<dt><img src="icons/tools.png">
<em>Additional tools</em></dt>
<dd>
<ul>
<li><em>Break selected lines/boundaries at intersection</em><br> Split
given vector line or boundary into two lines on given position
(based on <em><a href="v.clean.html">v.clean</a></em>,
<tt>tool=break</tt>).</li>
<li><em>Connect two selected lines/boundaries</em><br> Connect selected
lines or boundaries, the first given line is connected to the
second one. The second line is broken if necessary on each intersection.
The lines are connected only if distance between them is not greater
than snapping threshold value.</li>
<li><em>Copy categories</em><br>Copy category settings of
selected vector feature to other vector
features. Layer/category pairs of source vector features are
appended to the target feature category settings. Existing
layer/category pairs are not removed from category settings of
the target features.</li>
<li><em>Copy features from (background) map</em><br> Make identical copy of
selected vector features. If a background vector map has been
selected from the Layer Manager, copy features from background
vector map, not from the currently modified vector map.</li>
<li><em>Copy attributes</em><br>Duplicate attributes settings of
selected vector feature to other vector features. New
category(ies) is appended to the target feature category
settings and attributes duplicated based on category settings
of source vector features. Existing layer/category pairs are
not removed from category settings of the target
features.</li>
<li><em>Feature type conversion</em><br> Change feature type of selected
geometry features. Points are converted to centroids,
centroids to points, lines to boundaries and boundaries to
lines.</li>
<li><em>Flip selected lines/boundaries</em><br> Flip direction of
selected linear features (lines or boundaries).</li>
<li><em>Merge selected lines/boundaries</em><br> Merge (at least two)
selected vector lines or boundaries. The geometry of the
merged vector lines can be changed. If the second line from
two selected lines is in opposite direction to the first, it
will be flipped. See also
module <em><a href="v.build.polylines.html">v.build.polylines</a></em>.</li>
<li><em>Snap selected lines/boundaries (only to nodes)</em><br> Snap
vector features in given threshold. See also
module <em><a href="v.clean.html">v.clean</a></em>. Note that
this tool supports only snapping to nodes. Snapping to vector
features from background vector map is not currently
supported.</li>
<li><em>Split line/boundary</em><br>Split selected line or boundary on
given position.</li>
<li><em>Query tool</em><br>Select vector features by defining a threshold for
min/max length value (linear features or dangles).</li>
<li><em>Z-bulk labeling of 3D lines</em><br> Assign z coordinate values to 3D
vector lines in bounding box. This is useful for labeling contour lines.</li>
</ul>
</dd>
<dt><img src="icons/undo.png">
<em>Undo</em></dt>
<dd>Undo previous operations.</dd>
<dt><img src="icons/settings.png">
<em>Settings</em></dt>
<dd>Dialog for vector digitizer settings.</dd>
<dt><img src="icons/quit.png">
<em>Quit digitizing tool</em></dt>
<dd>Changes in vector map can be optionally discarded when
digitizing session is quited.</dd>
</dl>
<h2>NOTES</h2>
<dl><dt><b>Mouse button Functions:</b><dd>
<dt><i>Left</i> - select/deselect features</dt>
<dt><i>Control+Left</i> - cancel action/undo vertex</dt>
<dt><i>Right</i> - confirm action</dt>
</dl>
<p>
<i>Dead (deleted)</i> are internally only marked in the geometry file
as 'dead' but it remains there and occupies space. Any vector module
used afterwards on this vector map which really reads and writes
vector geometry (so not <em><a href="g.copy.html">g.copy</a></em>)
will writes only features which are 'alive'.
<p>
<i>Added or modified</i> vector features are <i>snapped</i> to
existing vector features (Settings→General→Snapping). To
disable snapping set the snapping threshold to '0'.
<p>
If the digitizer crashes for some reason you can repair the vector map
which was left open with the <em>v.build</em> module.
<h2>REFERENCE</h2>
<ul>
<li><a href="http://grass.osgeo.org/programming6/Vedit_Library.html">GRASS Vedit Library</a></li>
</ul>
<h2>SEE ALSO</h2>
<em>
<a href="wxGUI.html">wxGUI</a><br>
<a href="wxGUI.Components.html">wxGUI components</a>
</em>
<p>
<em>
<a href="v.edit.html">v.edit</a>,
<a href="v.category.html">v.category</a>,
<a href="v.build.html">v.build</a>
</em>
<p>
See also
the <a href="http://grasswiki.osgeo.org/wiki/WxGUI_Vector_Digitizer">wiki
page</a>
including <a href="http://grasswiki.osgeo.org/wiki/WxGUI_Vector_Digitizer#Vector_tutorials">video
tutorials</a>.
<h2>AUTHOR</h2>
Martin Landa, FBK-irst (2007-2008), Trento, Italy, and Czech Technical
University in Prague, Czech Republic
<p>
<i>$Date: 2013-02-15 23:04:18 +0100 (Fri, 15 Feb 2013) $</i>
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