Parent Topic: <A href="http://www.pcigeomatics.com/cgi-bin/pcihlp/GDB|GeoGateway+Data+Model">GeoGateway Data Model</a><hr>
<H4>Vectors (VEC)</H4>
Vector layers, or vector segments, are used to hold a set of related 
vectors. Vectors can be points, polylines (arcs), whole polygons, 
topological polygons, or objects without vertices which are really just
database records.<p>
Each vector object in GeoGateway is called a Shape. Each Shape has a
numeric identifier called a ShapeId that is unique within the layer, and
is greater than or equal to zero. While the ShapeIds are normally assigned
sequentially starting at zero, it is possible to have a layer with holes
between ShapeIds. <p>
Each Shape has a record of attributes associated with it. The attributes
are stored in the layer, and are considered to be part of the shape. Each
shape also has a list of zero or more vertices. Within GeoGateway the 
vertices are represented using double precision IEEE floating point numbers;
each vertex has an X, Y, and Z value. The vertices are presumed to be
coordinates in the georeferencing system of the vectors.
<P>
<ul>
<LI> <A href="http://www.pcigeomatics.com/cgi-bin/pcihlp/GDB|GeoGateway+Data+Model|Vectors+(VEC)|Attributes">Attributes</a>
<LI> <A href="http://www.pcigeomatics.com/cgi-bin/pcihlp/GDB|GeoGateway+Data+Model|Vectors+(VEC)|Rings">Rings</a>
<LI> <A href="http://www.pcigeomatics.com/cgi-bin/pcihlp/GDB|GeoGateway+Data+Model|Vectors+(VEC)|Topology">Topology</a>
<ul>
<LI> <A href="http://www.pcigeomatics.com/cgi-bin/pcihlp/GDB|GeoGateway+Data+Model|Vectors+(VEC)|Topology|Topological+Arc+Layers">Topological Arc Layers</a>
<LI> <A href="http://www.pcigeomatics.com/cgi-bin/pcihlp/GDB|GeoGateway+Data+Model|Vectors+(VEC)|Topology|Topological+Node+Layers">Topological Node Layers</a>
<LI> <A href="http://www.pcigeomatics.com/cgi-bin/pcihlp/GDB|GeoGateway+Data+Model|Vectors+(VEC)|Topology|Topological+Area+Layers">Topological Area Layers</a>
</ul>
<LI> <A href="http://www.pcigeomatics.com/cgi-bin/pcihlp/GDB|GeoGateway+Data+Model|Vectors+(VEC)|Representation+Style+Table">Representation Style Table</a>
<LI> <A href="http://www.pcigeomatics.com/cgi-bin/pcihlp/GDB|GeoGateway+Data+Model|Vectors+(VEC)|Vector+Projections">Vector Projections</a>
<LI> <A href="http://www.pcigeomatics.com/cgi-bin/pcihlp/GDB|GeoGateway+Data+Model|Vectors+(VEC)|Vector+Metadata">Vector Metadata</a>
<LI> <A href="http://www.pcigeomatics.com/cgi-bin/pcihlp/GDB|GeoGateway+Data+Model|Vectors+(VEC)|System+Attributes">System Attributes</a>
</ul>
<hr>
Parent Topic: <A href="http://www.pcigeomatics.com/cgi-bin/pcihlp/GDB|GeoGateway+Data+Model">GeoGateway Data Model</a><br>
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