SIMULATION METHODS of SYMBOLS And
VARIOUS TERRAIN MODELS FOR VISUAL IMPROVEMENT OF MAPPING
M.A.Bazina, S.V.Erukov,
A.L.Mjasnikov
Verkhnevolgskoe Aerogeodetic
vagp@mts-nn.ru
Now rapid development of computer technologies and software allows
to speak about the new approach to their usage in cartography. Development of
the information visualization technologies on the basis of hadware and
three-dimensional graphics software. Three-dimensional visualization of the
information in cartography opens additional capabilities for a lot of fields of
activity.
It is known, that any map and any image of geographical object is a
model. The model appears as the constructed image of real objects and
situations which allows to estimate their behavior and to find solution of the
problems.
Selecting a view and the shape of symbols mapping and the models of
terrain presented on an electronic map, the functional depending on assignment
of a map simulates forms that the image which is for the complete reaching the
purposes pursued by these change, namely for emphasis of attention or eduction
of the important properties of the visual information.
Model operation of visual symbol mapping on electronic maps consists
in change of their properties without change of their logically-semantic
loading. Visual properties of cartographic symbols are analysed by authors. At
the analysis of visual properties, proceeding from principles of the
cartographic symbols building where the unequivocal conformity of a graphics
image to the semantic content of mapped object is anchored, at observance of
semantic code principles, it is possible to draw a deduction, that change of
the basic visual properties of symbols which determine their correct both
unequivocal perception and a mental decode is intolerable.
In the report basic performances of various simulation methods of
the maps content and models of terrain are given, guidelines at their select
and usage are given, results of model operation are presented.
As a result of the total analysis and development of the relief
models visualization methods a software «Relief Visualization» have been made
by experts of the Verkhnevolgskoe Aerogeodetic
Enterprise. The
realized model of relief visualization with usage a texture in the form is
evident enough, symbols are precisely readable. In the report the basic
characteristics of the software and the gained results of relief visualization
are given.