Apply Filtering

At a zoomed out level many points of a geometric entity may be drawn into the same pixel on the screen. The aim of data reduction filtering data is to reduce the number of points used by an entity, thus reducing the number of points being overdrawn and more importantly reducing the load time and rendering time needed to display the entity.

Correct filtering parameter choices will remove sufficiently large enough numbers of points that the file size decreases substantially without changing the appearance of the data at the zoom levels it is to be viewed.

Data Reduction Filtering is applied to a completed Layer of data.

MapLink provides two distinct types of filtering techniques that can be used, which provide different levels of control and guarantees of data integrity. The first type of filter, named traditional filters, is actually a set of filters that allow geometry to be simplified based on a set of user-defined parameters. These filters provide a lot of control, but can be difficult to achieve the desired result with.

The second type of filter, named the perceptual filter, removes points from geometry that do not affect its appearance when viewed up to a defined zoom level. This filter is significantly easier to configure than the traditional filters as it automatically adapts its behaviour based on the current project.

Traditional Filters

Perceptual Filter