| # GRASS Help System

## DEFINING FRAMES AND REGIONS FOR DIGITIZING

The GRASS v.digit program is used to digitize data in GRASS vector format. Unlike most other GRASS programs, the "v.digit" program does NOT use the boundaries and resolution of the user's current geographic region. Instead, the user establishes map boundaries (the "digitizing region") when entering "v.digit", and modifies the map's resolution by setting the digitizing "threshold" in the "v.digit" Customize Menu.

When the user begins to digitize a file with "v.digit", the program asks the user to define the boundaries of the geographic region being digitized. Once the edges of this region are established, "v.digit" will recognize only data digitized by the user within these boundaries. This region is referred to as the "digitizing region".

Users can set different digitizing regions for each map digitized. Typically, users might elect to set these boundaries equal to those of the default region; however, this is up to the user. The current geographic region setting stored in the user's "WIND" file does not affect the user's digitizing session. Conversely, digitizing region setting does not affect the user's current geographic region setting.

Inside "v.digit", the user can graphically zoom into different areas within the digitizing region to aid digitizing. These zoom-in areas are referred to as "working frames". They do not affect which areas can be digitized, but only affect which areas of a map will be seen on the graphics monitor. Establishing working frames in "v.digit" does NOT alter the user's digitizing region nor the user's current geographic region settings.

Note: The current geographic region settings become important after all digitizing is done, when the user converts a digitized vector map to raster format.

For more information on digitizing maps, select the topic area "Digitizing and Map Development," located at the Help System Main Menu.

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Automatically created on: Fri Jun 7 11:46:09 2002