| NENA Standard for NG9-1-1 GIS Data Model
This document defines the Geographic Information Systems (GIS) Data Model, which supports the NENA Next Generation 9-1-1 (NG9-1-1) Core Services (NGCS) of location validation and routing, both geospatial call routing or to the appropriate agency for dispatch. This model also defines several GIS data layers used in local Public Safety Answering Point (PSAP) and response agency mapping applications for handling and responding to 9-1-1 calls.
The data structures defined in this document are related to, but different from the data structures defined in NENA-STA-010, Appendix B. Appendix B describes the Spatial Interface (SI). The purpose of the SI is to provision a functional element (e.g. the Emergency Call Routing Function) with GIS data. In contrast, this Data Model document describes the structure (e.g. field names, field data types, domains) of GIS data. Care has been taken to ensure that this Data Model is compatible with the SI provisioning process.