Identifier

<< Click to Display Table of Contents >>

EQuIS 7  >>  Professional > Glossary >

Identifier

The Identifier is a facility-specific coordinate Identifier, for example, PRIMARY. Each facility can have a record in DT_FACILITY to indicate which Identifier should be considered for mapping facility data (i.e. PRIMARY, SECONDARY, 1, 2, HISTORIC, etc.).

 

In the DT_COORDINATE table, the Identifier is used in conjunction with the COORD_TYPE_CODE to indicate unique coordinate systems for each facility. A facility may contain multiple coordinates for each location in DT_LOCATION. For example, a location may have coordinates in LAT LONG and in STATE PLANE. If a location had more than one set of coordinates in LAT LONG, the Identifier could be used to make these unique. An Identifier of PRIMARY could be used for the LAT LONG coordinates that were most recently surveyed. An Identifier of SECONDARY could be used to indicate that alternate LAT LONG values were from another source (i.e. HISTORIC) and not to be used for mapping. VW_LOCATION is used to indicate which COORD_TYPE_CODE and Identifier is used for third party mapping applications.