realizable from the computer graphics and visualized
representation point of view, i.e. the spatial feature has
information of general physical elements of geographic object,
and it is difficult to represent by 2D symbol but is convenient
for 3D symbol. For some abstract symbols, it is not suitable to
be represented by using 3D symbolic models, while can be
displayed by using models with dynamic and animation mode.
When designing 3D map symbol model, it should take the
symbol’s artistry and readability into account, as well as
symbol’s feasibility. Only all aspects are considered, the
system performance would be optimized deeply. Because the
symbol’s represent environments are different between 3D GIS
and 2D map, the general design principles and requirements are
different [3]. Some points below should be followed.