1g.gui.vdigit(1) GRASS GIS User's Manual g.gui.vdigit(1)
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6 g.gui.vdigit - Interactive editing and digitization of vector maps.
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9 general, GUI, vector, editing, digitizer
10
12 g.gui.vdigit
13 g.gui.vdigit --help
14 g.gui.vdigit [-c] map=name [--help] [--verbose] [--quiet] [--ui]
15 Flags:
17 -c
18 Create new vector map if doesn’t exist
19 --help
21 Print usage summary
22 --verbose
24 Verbose module output
25 --quiet
27 Quiet module output
28 --ui
30 Force launching GUI dialog
31 Parameters:
33 map=name [required]
34 Name of vector map to edit
35 Or data source for direct OGR access
36
38 The vector digitizer is a wxGUI component intended for interactive
39 editing and digitizing vector maps (see v.edit for non-interactive vec‐
40 tor editing GRASS capabilities).
41 Note that only vector maps stored or generated in the current mapset
43 can be opened for editing.
44 The digitizer allows editing of 2D vector features (points, lines, cen‐
46 troids, boundaries, and areas).
47 Vector features can be selected by mouse (bounding box or simply by
49 mouse click, see select threshold in SettingsâGeneralâSelect
50 threshold), or by query (eg. by line length, see SettingsâQuery
51 Tool).
52 STARTING THE DIGITIZER
54 The vector digitizer can be launched from Map Display toolbar by se‐
55 lecting "Digitize" from Tools combobox. Vector map is selectable for
56 editing from Digitizer toolbar ("Select vector map" combobox, note that
57 only vector maps from the current layer tree in Layer Manager are
58 listed). The vector digitizer can alternatively be activated from the
59 contextual menu in the Layer Manager by selecting "Start editing" on
60 selected vector map in the layer tree, or directly from the Layer Man‐
61 ager toolbar . The vector digitizer also can also be launched from the
62 command line as a stand-alone application g.gui.vdigit.
63 CREATING A NEW VECTOR MAP
65 A new vector map can be easily created from the digitizer toolbar by
66 selecting "New vector map" in "Select vector map" combobox. A new vec‐
67 tor map is created, added to the current layer tree in Layer Manager
68 and opened for editing. "Select vector map" combobox in the digitizer
69 toolbar also allows easily switching between vector maps to be edited.
70 EDITING AN EXISTING VECTOR MAP
72 An existing vector map selected in the digitizer toolbar in the "Select
73 vector map" combobox. This map is then opened for editing and added to
74 the current layer tree in the Layer Manager. This "Select vector map"
75 combobox in the digitizer toolbar also allows to easily switch between
76 vector maps to be edited.
77 USING A RASTER BACKGROUND MAP
79 In order to digitize from a raster map, simply load the map into the
80 Map Display using the Layer Manager. Then start digitizing, see below
81 for details.
82 USING A VECTOR BACKGROUND MAP
84 The vector digitizer allows you to select a "background" vector map.
85 Loading it within the digitizer is different from simply loading it via
86 Layer Manager since direct interaction with single vector features then
87 becomes possible.
88 Vector features may be copied from the background map by "Copy features
89 from (background) vector map" tool from the "Additional tools" of the
90 digitizer toolbar. Newly digitized vector features are snapped in the
91 given threshold to the features from the background map.
92 DIGITIZER TOOLBAR
94 Â Digitize new point
95 Add new point to vector map and optionally define its attributes
96 (Ctrl+P).
97 Â Digitize new line
99 Add new line to vector map and optionally define its attributes
100 (Ctrl+L).
101 Â Digitize new boundary
103 Add new boundary to vector map and optionally define its attributes
104 (Ctrl+B).
105 Â Digitize new centroid
107 Add new centroid to vector map and optionally define its attributes
108 (Ctrl+C).
109 Â Digitize new area
111 Add new area (closed boundary and one centroid inside) to vector
112 map and optionally define its attributes (Ctrl+A).
113 Â Move vertex
115 Move selected vertex of linear feature. Thus shape of linear fea‐
116 ture is changed (Ctrl+G).
117 Â Add vertex
119 Add new vertex to selected linear feature (shape not changed)
120 (Ctrl+V).
121 Â Remove vertex
123 Remove selected vertex from linear feature (Ctrl+X). Thus shape of
124 selected feature can be changed.
125 Â Edit line/boundary
127 Edit selected linear feature, add new segments or remove existing
128 segments of linear feature (Ctrl+E).
129 Â Move feature(s)
131 Move selected vector features (Ctrl+M.) Selection can be done by
132 mouse or by query.
133 Â Delete feature(s)
135 Delete selected vector features (point, line, centroid, or bound‐
136 ary) (Ctrl+D). Selection can be done by mouse or by query.
137 Â Delete areas(s)
139 Delete selected vector areas (Ctrl+F). Selection can be done by
140 mouse or by query.
141 Â Display/update categories
143 Display categories of selected vector feature (Ctrl+J). Category
144 settings can be modified, new layer/category pairs added or already
145 defined pairs removed.
146 Â Display/update attributes
148 Display attributes of selected vector feature (based on its cate‐
149 gory settings) (Ctrl+K). Attributes can be also modified. Same
150 functionality is accessible from Main toolbar "Query vector map
151 (editable mode)".
152 Â Additional tools
154 • Break selected lines/boundaries at intersection
156 Split given vector line or boundary into two lines on given po‐
157 sition (based on v.clean, tool=break).
158 • Connect two selected lines/boundaries
160 Connect selected lines or boundaries, the first given line is
161 connected to the second one. The second line is broken if nec‐
162 essary on each intersection. The lines are connected only if
163 distance between them is not greater than snapping threshold
164 value.
165 • Copy categories
167 Copy category settings of selected vector feature to other vec‐
168 tor features. Layer/category pairs of source vector features
169 are appended to the target feature category settings. Existing
170 layer/category pairs are not removed from category settings of
171 the target features.
172 • Copy features from (background) vector map
174 Make identical copy of selected vector features. If a back‐
175 ground vector map has been selected from the Layer Manager,
176 copy features from background vector map, not from the cur‐
177 rently modified vector map.
178 • Copy attributes
180 Duplicate attributes settings of selected vector feature to
181 other vector features. New category(ies) is appended to the
182 target feature category settings and attributes duplicated
183 based on category settings of source vector features. Existing
184 layer/category pairs are not removed from category settings of
185 the target features.
186 • Feature type conversion
188 Change feature type of selected geometry features. Points are
189 converted to centroids, centroids to points, lines to bound‐
190 aries and boundaries to lines.
191 • Flip selected lines/boundaries
193 Flip direction of selected linear features (lines or bound‐
194 aries).
195 • Merge selected lines/boundaries
197 Merge (at least two) selected vector lines or boundaries. The
198 geometry of the merged vector lines can be changed. If the sec‐
199 ond line from two selected lines is in opposite direction to
200 the first, it will be flipped. See also module v.build.poly‐
201 lines.
202 • Snap selected lines/boundaries (only to nodes)
204 Snap vector features in given threshold. See also module
205 v.clean. Note that this tool supports only snapping to nodes.
206 Snapping to vector features from background vector map is not
207 currently supported.
208 • Split line/boundary
210 Split selected line or boundary on given position.
211 • Query tool
213 Select vector features by defining a threshold for min/max
214 length value (linear features or dangles).
215 • Z-bulk labeling of 3D lines
217 Assign z coordinate values to 3D vector lines in bounding box.
218 This is useful for labeling contour lines.
219 Â Undo
221 Undo previous operations (Ctrl+Z).
222 Â Redo
224 Redo previous operations (Ctrl+Y).
225 Â Settings
227 Digitizer settings (Ctrl+T).
228 Â Show help
230 Show help page for the Digitizer (Ctrl+H).
231 Â Quit digitizing tool
233 Changes in vector map can be optionally discarded when digitizing
234 session is quited (Ctrl+Q).
235
237 Mouse button functions:
238 Left - select or deselect features
240 Control+Left - cancel action or undo vertex when digitizing lines
242 Right - confirm action
244 Dead (deleted) features are only marked as ’dead’ in the geometry file
246 but remain there and occupy space. Any vector module used afterwards on
247 this vector map which really reads and writes vector geometry (so not
248 g.copy) will write only features which are ’alive’.
249 Added or modified vector features are snapped to existing vector fea‐
251 tures (SettingsâGeneralâSnapping). To disable snapping set the
252 snapping threshold to ’0’.
253 If the digitizer crashes for some reason, the changes are automatically
255 saved. Broken topology can be repaired by running v.build.
256 GRASS GIS uses a topological vector format, meaning that a common
258 boundary of two polygons is only stored once. When digitizing polygons
259 it is thus important to be able to only draw each boundary once. When
260 drawing a polygon adjacent to an existing polygon, one has to first
261 split the existing boundary at the points where the new boundary will
262 be attached. Snapping should be set to ensure that the new boundaries
263 are automatically attached to the chosen points.
264
266 • GRASS Vedit Library
267 • Vector Database Management (Wiki page)
269
271 wxGUI
272 wxGUI components
273 v.edit, v.category, v.build, g.gui.rdigit, wxGUI.rdigit
275 See also the WxGUI Vector Digitizer Wiki page including video tutori‐
277 als.
278
280 Martin Landa, FBK-irst (2007-2008), Trento, Italy, and Czech Technical
281 University in Prague, Czech Republic
282
284 Available at: wxGUI Vector Digitizer source code (history)
285 Accessed: Saturday Oct 28 18:20:08 2023
287 Main index | GUI index | Topics index | Keywords index | Graphical in‐
289 dex | Full index
290 © 2003-2023 GRASS Development Team, GRASS GIS 8.3.1 Reference Manual
292GRASS 8.3.1 g.gui.vdigit(1)