Overview of Data Layering

Every map dataset displayed by the SDM comprises several layers.  Every layer falls into one of the following categories: 

Permanent Layers - defined and named in the Spatial Agent File (SAF) and may be of the following types:

A particular map can have any number of permanent layers, but CARIS File Layers and ESRI Shape Layers cannot be in the same map.

Transient Layers - a fixed set of layers with the following names:

created dynamically, in the above order, by the SDM upon loading a map, to hold temporary features created by clients..

Special Layers - created dynamically by the SDM when special tags are detected in the SAF, as follows: