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Creating Filters

You can create your own editable filters, based on the read-only filters in the (standard) library. You can either make an editable copy of an existing filter on which to base your new one, or you can use Find [Home-Selection]. Both methods are described on this page.

Some examples of creating filters are given in Filter examples.

Using Copy and Paste

Using the local commands on the Libraries Control Bar, copy a filter from the (standard) library and paste it into an editable library. It is best to copy a filter which is as similar as possible to the one you want to create, because this will require the least editing.

Once you have an editable copy, you can rename it and use the Properties... local command to edit it.

Using Find [Home-Selection]

The procedure for creating a filter using Find [Home-Selection] is as follows:

In the Libraries Control Bar, select the library where you want the new filter to be stored as the current library.
Select Find [Home-Selection] and the Filter tab.
Select a filter on which your new filter will be based. It is best to use one which is as similar as possible to the one you are about to create, as this means less editing.
In the Save filter as: box, give the new filter a name and click on Save Now.
The new filter is now in the current library. You can use its local command Properties… to edit it.

To view all the items, click on the horizontal arrow next to each item. The arrow will rotate 45 degress, become solid, and the structure of the filter will be shown.

To include items, click the circular button so that it becomes dark grey, or select them, then click Include. To exclude items, click the circular button so that it becomes white or select them, then click Exclude.

Click the Clipboard button and select Copy as SIS Expression to copy the Filter selections as a SIS expression.

As an example, if only the Road and Trails item is selected and all other items excluded:

the copied SIS expression would be:

(_FC& between 17004 and 17007 or _FC& between 17201 and 17224 or _FC& in (0,17,17001,17002,17100))

Apply this new filter by choosing it in the Overlays dialog General tab. See Types of Filter for more information on the different types of filters available.

Clearing a filter in use

An overlay filter remains in force until you clear it.

The Reset command on the overlay’s local menu on the Maps Control Bar removes the filter from use. In doing so, it makes all items on the overlay visible, and re-sets the filter tree.

Alternatively, on the Overlays dialog General tab, click on the cross adjacent to the filter to be cleared.

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