2011

Converting Nested Polylines to Polygons
This illustration shows a state with lakes as closed polylines.
To create a complex polygon with islands, holes, or discontinuous polygons,
first use the GROUP command to group the objects that you want to include
in the polygon. Then use the MAPPOLYLINETOPOLYGON command.
WARNING When you group objects, only the data from the outermost boundary
is maintained. The data from nested objects is lost.
To preserve nested data, you may want to convert your polylines in steps. For
example, in the illustration above, you could first query in the state and lake
boundaries, group all these objects, and create a polygon. The resulting polygon
will show the state with holes for the lakes, and will maintain only the state
data. Next, query in the lake polylines, do not group them, and then convert
the lake polylines to polygons. Each of the polygons representing the lakes
will have its data attached.
See also:
■
Converting Polygon Topology to Polygons (page 972)
■ Overview of Polygons (page 955)
■ Setting Polygon Options (page 977)
NOTE This procedure is for drawing objects only. For information about converting
polygonal geospatial feature data to polygons, see
To import polygons (page 430).
To convert polylines to polygons
1 Set the PROXYGRAPHICS system variable to 0.
Working with Polygon Objects | 971