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
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12 g.gui.vdigit
13 g.gui.vdigit --help
14 g.gui.vdigit [-c] map=name [--help] [--verbose] [--quiet] [--ui]
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16 Flags:
17 -c
18 Create new vector map if doesn’t exist
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20 --help
21 Print usage summary
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23 --verbose
24 Verbose module output
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26 --quiet
27 Quiet module output
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29 --ui
30 Force launching GUI dialog
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32 Parameters:
33 map=name [required]
34 Name of vector map to edit
35 Or data source for direct OGR access
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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).
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42 Note that only vector maps stored or generated in the current mapset
43 can be opened for editing.
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45 The digitizer allows editing of 2D vector features (points, lines, cen‐
46 troids, boundaries, and areas).
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48 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).
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53 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.
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64 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.
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71 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.
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78 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.
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83 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.
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93 DIGITIZER TOOLBAR
94 Â Digitize new point
95 Add new point to vector map and optionally define its attributes,
96 Ctrl+P.
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98 Â Digitize new line
99 Add new line to vector map and optionally define its attributes,
100 Ctrl+L.
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102 Â Digitize new boundary
103 Add new boundary to vector map and optionally define its at‐
104 tributes.
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106 Â Digitize new centroid
107 Add new centroid to vector map and optionally define its at‐
108 tributes.
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110 Â Digitize new area
111 Add new area (closed boundary and one centroid inside) to vector
112 map and optionally define its attributes.
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114 Â Move vertex
115 Move selected vertex of linear feature. Thus shape of linear fea‐
116 ture is changed.
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118 Â Add vertex
119 Add new vertex to selected linear feature (shape not changed).
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121 Â Remove vertex
122 Remove selected vertex from linear feature. Thus shape of selected
123 feature can be changed.
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125 Â Edit line/boundary
126 Edit selected linear feature, add new segments or remove existing
127 segments of linear feature.
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129 Â Move feature(s)
130 Move selected vector features. Selection can be done by mouse or by
131 query.
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133 Â Delete feature(s)
134 Delete selected vector features (point, line, centroid, or bound‐
135 ary). Selection can be done by mouse or by query.
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137 Â Delete areas(s)
138 Delete selected vector areas. Selection can be done by mouse or by
139 query.
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141 Â Display/update categories
142 Display categories of selected vector feature. Category settings
143 can be modified, new layer/category pairs added or already defined
144 pairs removed.
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146 Â Display/update attributes
147 Display attributes of selected vector feature (based on its cate‐
148 gory settings). Attributes can be also modified. Same functional‐
149 ity is accessible from Main toolbar "Query vector map (editable
150 mode)".
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152 Â Additional tools
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154 • Break selected lines/boundaries at intersection
155 Split given vector line or boundary into two lines on given po‐
156 sition (based on v.clean, tool=break).
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158 • Connect two selected lines/boundaries
159 Connect selected lines or boundaries, the first given line is
160 connected to the second one. The second line is broken if nec‐
161 essary on each intersection. The lines are connected only if
162 distance between them is not greater than snapping threshold
163 value.
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165 • Copy categories
166 Copy category settings of selected vector feature to other vec‐
167 tor features. Layer/category pairs of source vector features
168 are appended to the target feature category settings. Existing
169 layer/category pairs are not removed from category settings of
170 the target features.
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172 • Copy features from (background) vector map
173 Make identical copy of selected vector features. If a back‐
174 ground vector map has been selected from the Layer Manager,
175 copy features from background vector map, not from the cur‐
176 rently modified vector map.
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178 • Copy attributes
179 Duplicate attributes settings of selected vector feature to
180 other vector features. New category(ies) is appended to the
181 target feature category settings and attributes duplicated
182 based on category settings of source vector features. Existing
183 layer/category pairs are not removed from category settings of
184 the target features.
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186 • Feature type conversion
187 Change feature type of selected geometry features. Points are
188 converted to centroids, centroids to points, lines to bound‐
189 aries and boundaries to lines.
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191 • Flip selected lines/boundaries
192 Flip direction of selected linear features (lines or bound‐
193 aries).
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195 • Merge selected lines/boundaries
196 Merge (at least two) selected vector lines or boundaries. The
197 geometry of the merged vector lines can be changed. If the sec‐
198 ond line from two selected lines is in opposite direction to
199 the first, it will be flipped. See also module v.build.poly‐
200 lines.
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202 • Snap selected lines/boundaries (only to nodes)
203 Snap vector features in given threshold. See also module
204 v.clean. Note that this tool supports only snapping to nodes.
205 Snapping to vector features from background vector map is not
206 currently supported.
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208 • Split line/boundary
209 Split selected line or boundary on given position.
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211 • Query tool
212 Select vector features by defining a threshold for min/max
213 length value (linear features or dangles).
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215 • Z-bulk labeling of 3D lines
216 Assign z coordinate values to 3D vector lines in bounding box.
217 This is useful for labeling contour lines.
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219 Â Undo
220 Undo previous operations.
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222 Â Redo
223 Redo previous operations.
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225 Â Settings
226 Digitizer settings.
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228 Â Quit digitizing tool
229 Changes in vector map can be optionally discarded when digitizing
230 session is quited.
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233 Mouse button functions:
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235 Left - select or deselect features
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237 Control+Left - cancel action or undo vertex when digitizing lines
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239 Right - confirm action
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241 Dead (deleted) features are only marked as ’dead’ in the geometry file
242 but remain there and occupy space. Any vector module used afterwards on
243 this vector map which really reads and writes vector geometry (so not
244 g.copy) will write only features which are ’alive’.
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246 Added or modified vector features are snapped to existing vector fea‐
247 tures (SettingsâGeneralâSnapping). To disable snapping set the
248 snapping threshold to ’0’.
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250 If the digitizer crashes for some reason, the changes are automatically
251 saved. Broken topology can be repaired by running v.build.
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253 GRASS GIS uses a topological vector format, meaning that a common
254 boundary of two polygons is only stored once. When digitizing polygons
255 it is thus important to be able to only draw each boundary once. When
256 drawing a polygon adjacent to an existing polygon, one has to first
257 split the existing boundary at the points where the new boundary will
258 be attached. Snapping should be set to ensure that the new boundaries
259 are automatically attached to the chosen points.
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262 • GRASS Vedit Library
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264 • Vector Database Management (Wiki page)
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267 wxGUI
268 wxGUI components
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270 v.edit, v.category, v.build, g.gui.rdigit, wxGUI.rdigit
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272 See also the WxGUI Vector Digitizer Wiki page including video tutori‐
273 als.
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276 Martin Landa, FBK-irst (2007-2008), Trento, Italy, and Czech Technical
277 University in Prague, Czech Republic
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280 Available at: wxGUI Vector Digitizer source code (history)
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282 Accessed: Saturday Jan 21 21:17:59 2023
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284 Main index | GUI index | Topics index | Keywords index | Graphical in‐
285 dex | Full index
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287 © 2003-2023 GRASS Development Team, GRASS GIS 8.2.1 Reference Manual
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291GRASS 8.2.1 g.gui.vdigit(1)