v.digit - A menu-driven, highly interactive map
development program used for vector digitizing, editing,
labeling and converting vector data to raster format.
(GRASS Vector Program)
The GRASS program v.digit is a menu-driven, highly
interactive map development program used for inputting
analog map data into a GRASS vector format.
v.digit contains programs for vector digitizing,
editing, labeling, windowing, and converting vector data to
GRASS raster format.
consists of two parts: an initialization procedure,
and a multiple menu-driven environment.
- The initialization procedure involves choosing a digitizer,
choosing the name of a vector map layer to digitize, and,
if needed, registering a map to the digitizing surface.
- The second part of v.digit is a multiple-menu
environment in which digitizing, editing, labeling, and
other options are available. It is within this second
portion of v.digit that all vector creation
The GRASS 4.1 version of v.digit has been upgraded
so that it now no longer requires drivers to be written for
each digitizer supported. Instead we are using device
independent code written originally by John Dabritz
formerly of the Forest Service, which uses ascii
description files to define how to communicate with the
digitizer. The result is that we should be able to support
just about any digitizer out there now with a minimum of
work. Refer to the "digitizer definition manual" for
information on the format of these files.
v.digit was written to optimize digitizing speed
and performance. It has a convenient graphic display
format and very convenient windowing capabilities. Features
are color-coded for ease of identification and
verification. Different color schemes may be user-chosen
to customize a digitizing session.
Area, line, and point features may be digitized in both
"stream" and "point" modes. Both a mouse and a digitizer
may be used to perform windowing functions. Labeling and
editing are done from within v.digit, rather than
through a separate set of programs.
v.digit has capabilities that allow users to
convert vector map layers to GRASS raster format, to
overlay already existing vector map layers onto the feature
being digitized, and set a multitude of parameters to
customize a digitizing session.
v.digit may be used with or without a digitizer.
Many options are available if no digitizer is used.
All options available within v.digit are contained
within ten menus. Movement from menu to menu is done by
chosing the movement options specified at the bottom of
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