By Androulla Efeftheriou
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Extra info for All About Thalassaemia
7(b)). A larger number of grey shades have been used in the lather to give an indication of shading without the imposition of classes. The contrast in density between the rural areas in the west of the county and the more urbanized areas in the east is noticeable in these two maps. 7 Contiguity A by-product of the creation of a topologically correct polygon layer can be a table showing, for each arc in the layer, the IDs of the polygons on either side of the arc. Such a table can be useful in the dissolve operation.
For points on the edge of the study area, the boundaries of Thiessen polygons tend to form exaggerated areas (usually they are far too large). A possible solution is to T H E R O L E O F G E O G R A P H I C A L I N F O R M AT I O N S Y S T E M S 39 clip the layer with a digitized boundary to remove the worst of the problem polygons. Thiessen polygons can be useful for producing choropleth maps from point data. In reality many boundaries tend to exhibit both local convexities and concavities; as an example, a boundary which follows the path of a meandering river will be alternately convex and concave.
The simplest is to store the closed polygons, and the associated attribute data, in separate ®les. This means that the boundaries between adjacent polygons are stored twice. It also means that the determination of adjacency becomes a cumbersome process. A commonly encountered solution is to store internal boundaries only once, with an extra ®le containing entries that indicate which boundaries should be put together to represent any given polygon in the study area. A by-product of this mode of storage is that determining polygon adjacency is easy (this is required for some of the techniques described in this book).