cover

Natural or manmade objects on the bottom of lakes, rivers, or impoundments, especially those that influence fish behavior. Examples include stick-ups, tree lines, stumps, rocks, logs, pilings, docks, and weed patches.

Vegetation, rocks, or other materials used by wildlife for protection from predators or weather.

A unique sequence number automatically generated by ARC/INFO for each coverage feature. This internal number is used to directly access features and to describe topological relationships between coverage features. It is often referred to as the 'record number'.

The technique of concealing or altering the characteristics of communications patterns for the purpose of denying an unauthorized receiver information that would be of value; a process of modulo two addition of a pseudorandom bit stream generated by a cryptographic device with bits from the control message.