Columns may be added to and removed from any layer. There are some restrictions on exactly how this is done.
Table 4.1. Column Change Restrictions
| Layer Type | Restrictions |
|---|---|
| All By Reference Layers | Columns added to By Reference layers will require either internal saving or updating the original file to keep their data. This only happens when you save the Map Set, so if you are doing this temporarily there is no harm. The only exception to this are Formula Columns, which are only stored in the Map Set and can continue to use the By Reference data. |
| WFS Layers | Columns added to WFS Layers will not create new columns on the server. Any data that is added to these layers will be lost when the Map Set is saved and re-opened. As with By Reference layers, Formula Columns will have their data recomputed on load and thus will not be lost when saving a Map Set. |
| Live Maps | There are no features and thus no columns for Live Maps. |
Columns of any data type may be added in Cartographica. By default, the command from the menu will add a String column, which can represent textual or numeric data.
Adding Columns to a Layer
Select the layer in the Layer Stack
Choose > to bring up the Layer Info window
Click the Fields tab to show the list of columns
Do one of the following:
Click
Choose >
A new column will be added to the column list and brought into view
Optionally change the type of the column by selecting from the corresponding Type cell
Optionally change the size of the column by clicking in the corresponding Length cell