v.in.tiger.scs - Converts ASCII TIGER data files from the
U.S. Dept. of Commerce Bureau of the Census.
(SCS GRASS Vector Program)
v.in.tiger.scs [ -cv] tig1=name tig2=name out=name cfc=name[,name,...]
This program imports Census line features from TIGER records type1 and type2
into GRASS vector format. Both pre-Census and post-Census data formats
can be used. Specific Census Feature Class Codes (CFCC) can be extracted
completely or in various combinations. These codes are described in the
TIGER/line Census Files 1990 documemtation available from the Bureau
of the Census. An additional feature code consisting of the three letters
"BOU" may also be specified to extract a county boundary. Condensed Record
1 files may be imported with the -c flag. These files should be identified
with a trailing "x" character on the filename.
COMMAND LINE OPTIONS
- Condensed TIGER file.
- Verbose output.
- TIGER file 1.
- TIGER file 2.
- New vector file name.
- Specific Census Feature Class (CFCC) codes.
To extract all Primary (A1) and Secondary (A2) roads from a county's
TIGER files the following command would be used:
v.in.tiger.scs tig1=t12113.1 tig2=t12113.2 out=roads
To extract all the Hydrographic features in a county's TIGER
files with verbose output:
v.in.tiger.scs -v tig1=t12113.1 tig2=t12113.2 out=hydro
To extract the county boundary the command would be:
v.in.tiger.scs tig1=t12113.1 tig2=t12113.2 out=bou
The TIGER files must in sorted order before being used.
This can be done by using the following command:
sort TGR12113.F21 -o t12113.1
sort TGR12113.F22 -o t12113.2
For consistency the sorted file should be written as above.
It should consist of a 't' followed by the State and County FIPS code,
then a '.' and then a value to identify the record number.
The CFCC code 'BOU' used to extract the County Boundary should be used alone
as it will result in a polygon AREA being created.
Currently output is in UTM only.
Paul H. Fukuhara, USDA SCS National Cartographic Center