The vectordigitizer is a wxGUI component intended for interactive editing and digitizing vector maps
(see v.edit for non-interactive vector editing GRASS capabilities).
Note that only vector maps stored or generated in the current mapset can be opened for editing.
The digitizer allows editing of 2D vector features (points, lines, centroids, boundaries, and areas).
Vector features can be selected by mouse (bounding box or simply by mouse click, see select threshold in
Settings→General→Selectthreshold), or by query (eg. by line length, see Settings→QueryTool).
STARTINGTHEDIGITIZER
The vector digitizer can be launched from Map Display toolbar by selecting "Digitize" from Tools
combobox. Vector map is selectable for editing from Digitizer toolbar ("Select vector map" combobox, note
that only vector maps from the current layer tree in Layer Manager are listed). The vector digitizer can
alternatively be activated from the contextual menu in the Layer Manager by selecting "Start editing" on
selected vector map in the layer tree, or directly from the Layer Manager toolbar . The vector digitizer
also can also be launched from the command line as a stand-alone application g.gui.vdigit.
CREATINGANEWVECTORMAP
A new vector map can be easily created from the 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 the digitizer toolbar also allows easily
switching between vector maps to be edited.
EDITINGANEXISTINGVECTORMAP
An existing vector map selected in the digitizer toolbar in the "Select vector map" combobox. This map is
then opened for editing and added to the current layer tree in the LayerManager. This "Select vector
map" combobox in the digitizer toolbar also allows to easily switch between vector maps to be edited.
USINGARASTERBACKGROUNDMAP
In order to digitize from a raster map, simply load the map into the MapDisplay using the LayerManager.
Then start digitizing, see below for details.
USINGAVECTORBACKGROUNDMAP
The vector digitizer allows you to select a "background" vector map. Loading it within the digitizer is
different from simply loading it via LayerManager since direct interaction with single vector features
then becomes possible.
Vector features may be copied from the background map by "Copy features from (background) vector map"
tool from the "Additional tools" of the digitizer toolbar. Newly digitized vector features are snapped
in the given threshold to the features from the background map.
DIGITIZERTOOLBARDigitizenewpoint
Add new point to vector map and optionally define its attributes (Ctrl+P).
Digitizenewline
Add new line to vector map and optionally define its attributes (Ctrl+L).
Digitizenewboundary
Add new boundary to vector map and optionally define its attributes (Ctrl+B).
Digitizenewcentroid
Add new centroid to vector map and optionally define its attributes (Ctrl+C).
Digitizenewarea
Add new area (closed boundary and one centroid inside) to vector map and optionally define its
attributes (Ctrl+A).
Movevertex
Move selected vertex of linear feature. Thus shape of linear feature is changed (Ctrl+G).
Addvertex
Add new vertex to selected linear feature (shape not changed) (Ctrl+V).
Removevertex
Remove selected vertex from linear feature (Ctrl+X). Thus shape of selected feature can be changed.
Editline/boundary
Edit selected linear feature, add new segments or remove existing segments of linear feature
(Ctrl+E).
Movefeature(s)
Move selected vector features (Ctrl+M.) Selection can be done by mouse or by query.
Deletefeature(s)
Delete selected vector features (point, line, centroid, or boundary) (Ctrl+D). Selection can be done
by mouse or by query.
Deleteareas(s)
Delete selected vector areas (Ctrl+F). Selection can be done by mouse or by query.
Display/updatecategories
Display categories of selected vector feature (Ctrl+J). Category settings can be modified, new
layer/category pairs added or already defined pairs removed.
Display/updateattributes
Display attributes of selected vector feature (based on its category settings) (Ctrl+K). Attributes
can be also modified. Same functionality is accessible from Main toolbar "Query vector map (editable
mode)".
Additionaltools
• Breakselectedlines/boundariesatintersection
Split given vector line or boundary into two lines on given position (based on v.clean,
tool=break).
• Connecttwoselectedlines/boundaries
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.
• Copycategories
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.
• Copyfeaturesfrom(background)vectormap
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.
• Copyattributes
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.
• Featuretypeconversion
Change feature type of selected geometry features. Points are converted to centroids, centroids
to points, lines to boundaries and boundaries to lines.
• Flipselectedlines/boundaries
Flip direction of selected linear features (lines or boundaries).
• Mergeselectedlines/boundaries
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 v.build.polylines.
• Snapselectedlines/boundaries(onlytonodes)
Snap vector features in given threshold. See also module v.clean. Note that this tool supports
only snapping to nodes. Snapping to vector features from background vector map is not currently
supported.
• Splitline/boundary
Split selected line or boundary on given position.
• Querytool
Select vector features by defining a threshold for min/max length value (linear features or
dangles).
• Z-bulklabelingof3Dlines
Assign z coordinate values to 3D vector lines in bounding box. This is useful for labeling
contour lines.
Undo
Undo previous operations (Ctrl+Z).
Redo
Redo previous operations (Ctrl+Y).
Settings
Digitizer settings (Ctrl+T).
Showhelp
Show help page for the Digitizer (Ctrl+H).
Quitdigitizingtool
Changes in vector map can be optionally discarded when digitizing session is quited (Ctrl+Q).
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