Parent Topic: <A href="http://www.pcigeomatics.com/cgi-bin/pcihlp/GDB|GeoGateway+Data+Model|Vectors+(VEC)|Topology">Topology</a><hr>
<br><b>Topological Arc Layers</b><br>
In addition to the topological metadata information, a Topological arc 
layer must contain the following attributes:<p>
StartNodeId: Attribute containing the GDBShapeId of the starting node. <p>
EndNodeId: Attribute containing the GDBShapeId of the ending node for this
arc.<p>
LeftAreaId: Attribute containing the GDBShapeId of the left area polygon,
or GDBNullShapeId if there isn't such an area. <p>
RightAreaId: Attribute containing the GDBShapeId of the right area polygon,
or GDBNullShapeId if there isn't such an area. <p>
An arc must have at least 2 vertices.<p>
An arc layer must have NODE_REF, and AREA_REF metadata pointing to the
related node, and area layers. It must also have a LAYER_TYPE of TOPO_ARCS
indicator in metadata.
<P>
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Parent Topic: <A href="http://www.pcigeomatics.com/cgi-bin/pcihlp/GDB|GeoGateway+Data+Model|Vectors+(VEC)|Topology">Topology</a><br>
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