How to import DLG data in optional format

[Louis Clarke]

Casey,
     You need to do some modifications to each of these 8 files before you can 
use v.patch and have a complete quad.
     I have only worked with 1:100,000 DLG quads from USGS and from the file 
names it appears that is what you are working with also.  First you must add 
record deliminators to each file, so at the % prompt in unix:

%dd if=AU.BDF01.opt of=AU.BDF01d.opt ibs=8000 cbs=80 conv=unblock

Relocate file to dlg subdirectory of your mapset:

%mv AU.BDF01d.opt /grass/MAPSET/dlg/AU.BDF01d.opt

Start GRASS at the % prompt:

%grass4.1
   and after accepting mapset

grass>v.in.dlg -l input=AU.BDF01.opt output=featurename.01
   this command gave precedence to line data as opposed to area (good for 
   linear data), and places GRASS vector file in dig subdirectory

grass>v.support
   featurename.01  (is the vector file)
   1  (select to build topology)
   N  (do not snap points)

     this command has created the support files needed to use v.digit to 
remove the Neatlines.

     [I remember some discussion on this list about a quick way to remove the 
      Neatlines.  I only know how to remove the Neatline one piece at a time 
      using v.digit]

grass>d.mon start=x0

grass>v.digit
     featurename.01  (file is displayed on the black mon)
     E   (begins edit session)
     r   (begins remove line session - move the mouse and press the left button
          when positioned above the line (selected line changes to yellow), if 
          this is the correct line to remove, press the right mouse button, 
          otherwise select a different line.  Continue until you have removed 
          all the lines you wish to remove, then press the middle button (while
          mouse is positioned in the monitor) to quit the removal line session.
)
          Position the mouse in the text window and:
     q   (quit edit session)
     Q   (save changes and Quit v.digit)

You can now display the vector file as a GRASS layer.

You can also use v.patch to add all the vectors into one layer

I hope this helps.
===========================================================================
Louis Clarke                           U.S. Army Corps of Engineers
lclarke at alb-co-r.swa.usace.army.mil    Albuquerque District
voice (505)254-3281                    Regulatory Branch
FAX (505)254-3498