Parent Topic: <A href="http://www.pcigeomatics.com/cgi-bin/pcihlp/GDB|Supported+File+Formats">Supported File Formats</a><hr>
<H4>DLG (USGS Digital Line Graph)</H4>
USGS DLG (Digital Line Graphs) are supported for reading and writing by the
GeoGateway Library. The full topology of a DLG file is not retained during
a read 
operation. Any Area information present in a DLG file will not be retained. 
In addition, only the first attribute code of a line will be retained, all 
others will be skipped.<p>
DLG files written out by this program are equivalent to DLG level 2 files. 
When DLG files are written out, a node list is generated, and node-to-line as
well as line-to-node linkages are generated. Since the full topology of the
file is not retained, the left and right area fields of a Line Record will
be initialized with a -1.<p>
USGS DLG files may be created by Works programs. The DLGREAD and DLGWRIT
programs may also be used to import and export DLG format vector data.
<P>

See Also: <A HREF = "http://www.pcigeomatics.com/cgi-bin/pcihlp/WORKS|Data+File|File+Creat">Create File</A>, <A HREF = "http://www.pcigeomatics.com/cgi-bin/pcihlp/DLGREAD">DLGREAD</A>, <A HREF = "http://www.pcigeomatics.com/cgi-bin/pcihlp/DLGWRIT">DLGWRIT</A>, <A HREF = "http://www.pcigeomatics.com/cgi-bin/pcihlp/FIMPORT">FIMPORT</A><P>
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Parent Topic: <A href="http://www.pcigeomatics.com/cgi-bin/pcihlp/GDB|Supported+File+Formats">Supported File Formats</a><br>
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