What is a Filter?

Overlay filters control which items are displayed in the map window.

Filters are simply named objects stored in Named Object Libraries (NOLs) and use item properties to include ("pass") some items but exclude ("fail") others.

Filters (or a combination of filters) can be used on item classes, features, properties. Related Topics

Filtered out items are not displayed (and so cannot be edited either). If you CREATE items excluded by the filter these will be drawn but not shown.

Filters are useful in making items temporarily invisible without having to delete them. In addition, many Cadcorp SIS Desktop methods, e.g. Scan, accept a Filter as an argument.