v.in.dxf3d

NAME

v.in.dxf3d - Converts the Z values of DXF files to attribute GRASS vector file format.
(GRASS Vector Program)

SYNOPSIS

Bv.in.dxf3dR
Bv.in.dxf3d helpR
v.in.dxf3d dxf=name [lines=name[,name,...]]

DESCRIPTION

The v.in.dxf3d data conversion program generates GRASS dig_att files from a DXF file with Z values.

This program, in conjunction with v.in.dxf, is ideal for automaticaly importing, to GRASS vector file, layers with Z values (isolines and level contours) from DXF format files.

Firts should be run the v.in.dxf program for import the DXF polylines to binary GRASS vector file format (dig). Later, the DXF Z values of the isolines layers with v.in.dxf3d (dig_att) must be imported, and finally run v.support to attach at this layers their elevations. The v.in.dxf3d.sh script can be used to make all this automaticaly, for a maximun of two isolines layers (normally contours and master contours) from one DXF file.

The v.in.dxf program only recognizes, by now, the Z values from polylines entities in the DXF format.

COMMAND LINE OPTIONS

Parameters

dxf

Name of the DXF input design file from where will be extracted the Z values.

lines

Name(s) of layer(s) in DXF input file containing isoline data with Z values, and the name(s) to be assigned to the GRASS vector data (dig_att) files output.

BUGS

The program only recognizes the Z values if they are in the "30" field of the POLYLINE entity section.

If the input DXF file is in MS-DOS text format, with CR/LF instead of Unix LF, the program doesn't run. To avoid this problem, import to Unix your DXF-MSDOS format files with FTP in ascii mode or with a command able to convert this files (DOS-COPY, mcopy, etc).

AUTHOR

The original program dxf3d2gras.bas written in GWBASIC (MS-DOS) by Evaristo Quiroga, Hidrologic and Extern Geodinamic Unity of the University Autonoma of Barcelona (6/93).