About Triangulated Irregular Networks
Surfaces and 3D regions are represented by a triangulated irregular network (TIN) - that is, a network of triangles joined at their vertices. The size and number of these triangles will determine some key performance characteristics:
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The resolution of the scene.
Larger triangles make for a coarse scene, smaller triangles for finer scene. -
The memory required to store the scene.
The TIN is stored in the EV file. The more triangles, the more space is required, the larger the EV file. -
The processing power/time required to render the scene.
The TIN is rendered on the screen in 3 dimensional perspective. The more triangles, the more power or time will be required to affect this rendering.
The resolution of the resampled surfaces is defined independently in two directions (north-south and east-west).