A point is represented as a pair of numbers. In addition to modeling an area as a collection of objects in a table, it is also necessary to consider surface areas as a whole. The returned raster image should contain its bounding box. Lineid, leftpoly, rightpoly, leftconnect, rightconnect, polyline. Note that a data supplier may wish to treat a tesselation of the plane as a collection of polygons.
Graphic representation is dealt with in the following manner.
Part of it is included in the meta-data, where per attribute suggested colors, line styles, and fonts, can be defined. The format of a query The use of the object-relational formalism gives us immediately a flexible method to ask questions to a geographic server. We employ for this the convention commonly used on the Internet to encode a simple query to a database as part of the file name. First the name of the database is mentioned, followed by the name of the table. Then the attributes desired from the table, and finally a where clause.