tig.rim.sh

NAME

tig.rim.sh - Generates various vector maps from a rim/TIGER data base.
(GRASS Shell Script)

SYNOPSIS

tig.rim.sh help
tig.rim.sh dbname tractN1 tractN2 ...

DESCRIPTION

tig.rim.sh is a shell script which queries information from a rim data base using the GRASS command v.db.rim, which is an interface between GRASS and RIM. The dbname given on the command line should be the name of a rim data base created using v.in.tiger. tig.rim.sh will create several new vector files. Three of these are: a county outline map, a map of tract boundaries within the county, and a map showing block group boundaries. For every tract number given on the input line, additional vector maps will be created showing: the tract outline, a block group boundary map for each block group within the tract, and a map showing block boundaries within each block group. Output files will be named dbname.county, dbname.tract and dbname.bg for the map layers showing the county outline, the tract outlines within the county, and the block group boundaries within the county. The vector file showing the boundary for an individual tract will be named TtractN, where tractN is the tract number given on the command line. The vector files created to show an individual block group boundary and block boundaries within that block group will be named using the appropriate tract number and block group number as part of the name, with suffixes of .bg and .bk respectively.

OPTIONS

Parameters:

dbname: Name of an existing rim data base.
tractN: Number of a tract located within this county.

NOTES

This command must be installed separately as part of the package of routines dealing with the import of Census (TIGER) data. It requires the use of rim and v.db.rim, which must be compiled first.

You must include at least one tract number on the command line for this command to function. Use tiger.info.sh to obtain all tract numbers for a given TIGER type1 data file.

If the master binary vector file created using v.in.tiger is modified after it is in GRASS, this program will probably not work. In that situation, the processes from this shell script may simply be run by hand, using v.db.rim directly, but searching the old vector file to find lines for the new vector files without using the binary offset field (vectoff).

Vector files showing the block boundaries within a block group may contain hydrology lines, which in fact define the edge of a census block.

AUTHOR

Jim Hinthorne and David Satnik, GIS Lab, Central Washington University, Ellensburg, WA.