transfer vector stream to raster stream

[Greg Thacker]

John,

If you can change the dig_att directory and dig_cats if you have one
by using unix commands or an awk script.  This is an example of how
we change the attribute codes as we bring them in at USACERL TAC.

1) Write a simple awk script using vi. call it any thing you want.
   It will look like this:
  
        {print $1, $2, $3, 1} 

   This prints out fields 1, 2, and 3 without
   changing them.  The fourth field is now a 1 or what ever attribute
   code you wish to assign to the file you are extracting.

   (For my purposes I made seven of these files and called them
        
        tig.1 tig.2 and so on. )

2) Extract only those files you wish to assign to that attribute code.
   For example, you may want to extract the A0 files first and then run the
   awk script command, explained in step 3.

3) From the command line you will want to give a command like this:

        awk -f tig.1 input.filename > temp

        this runs your awk script using the dig_att file and directs
        it to a new file called temp.

4) Remove the old dig_att file and move the temp file into a new file 
   with the same name as the old dig_att file. For example:

        rm roads.columbia
        mv temp roads.columbia


Since you have extracted all the data you may only want to change field 4 ($4)
by using the awk script command above.

Hope this helps.

Greg Thacker
USACERL TAC
thacker at vinny.cecer.army.mil