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GRASS 4.1 U.S. Army CERL 1 <br /> v.support <main> GRASS Reference Manual <main> v.support <br /> threshold=value Snapping threshold value to be used when <br /> building topology. Valid only with build <br /> option and -s flag. <br /> The user can run this program non-interactively by <br /> specifying parameter values (and optionally, flag settings) <br /> on the command line. <br /> Alternately, the user can simply type the command v.support <br /> on the command line. In this event, the program will prompt <br /> the user to enter parameter values and flag settings. <br /> If the build option is chosen, the user may further specify <br /> the -s flag, to snap nodes in the vector file. If nodes are <br /> to be snapped, the user can either: (1) use the calculated <br /> default threshold (based on the scale of vector data); (2) <br /> enter the -p flag, causing the program to prompt the user <br /> for a snapping threshold value; or (3) enter a specific <br /> threshold value on the command line. <br /> The spatial assignment of category values (found in the <br /> dig_att file) is also performed during building of file <br /> topology. <br /> The edit option allows the user to edit the category labels <br /> to be associated with the category values attached to the <br /> vector data during topology building. These labels, if <br /> created, are then used for raster map layers derived from <br /> their vector counterparts. The labels are placed in the <br /> dig_cats directory. <br /> NOTES <br /> A dig_plus file must be created for each imported vector map <br /> before it can be used in post-GRASS 3.0 versions of digit <br /> (now referred to as v.digit). <br /> Topological information for GRASS vector files can also be <br /> built using option 4 of the v.import program. <br /> This program will convert pre-4.0 version GRASS vector files <br /> to 4.0 format. <br /> v.support creates support files only for binary vector files <br /> located in the user's current mapset. <br /> SEE ALSO <br /> v.digit, v.import, v.in.ascii, v.prune, v.to.rast <br /> AUTHORS <br /> Dave Gerdes, U.S. Army Construction Engineering Research <br /> Laboratory <br /> Michael Higgins, U.S. Army Construction Engineering Research <br />Page 13 <br />01/03/97 2.03-02 - Lange <br />