ISO 17572系列规定了位置参考方法（LRM），该方法描述了地理数据库上下文中的位置，并用于定位编码器系统和解码器侧的与运输相关的现象。本文件定义了这些对象的含义，并详细描述了参考，包括参考的组成部分是强制性的还是可选的，以及它们的特征。 ISO 17572系列规定了三种不同的LRM: —？预编码LRM（预编码外形）； —？动态LRM（动态剖面）； —？精确相对LRM（精确相对轮廓）。 ISO 17572系列没有定义实施LRM的物理格式。然而，对物理格式的要求已经确定。 ISO 17572系列没有定义位置参考系统（LRS）的详细信息，即如何在软件、硬件或过程中实施LRM。 本文件规定了以下与LRM相关的一般主题: —？LRM的要求； —？LRM的概念数据模型； —？库存LRM（见附录A）。 本文件还提供: —？概念模型使用示例（见附录B）； —？定义与ISO/TC 211的比较（见附录C）。

The ISO 17572 series specifies location referencing methods (LRMs) that describe locations in the context of geographic databases and that are intended for use in locating transport-related phenomena both in an encoder system and from the decoder side. This document defines what is meant by such objects and describes the reference in detail, including whether or not components of the reference are mandatory or optional, and their characteristics. The ISO 17572 series specifies three different LRMs: —？pre-coded LRM (pre-coded profile); —？dynamic LRM (dynamic profile); —？precise relative LRM (precise relative profile). The ISO 17572 series does not define a physical format for implementing the LRM. However, the requirements for physical formats are defined. The ISO 17572 series does not define details of the location referencing system (LRS), i.e. how the LRMs are to be implemented in software, hardware or processes. This document specifies the following general LRM-related subjects: —？requirements of an LRM; —？conceptual data model for LRMs; —？inventory LRMs (see Annex？A). This document also provides: —？examples of conceptual model use (see Annex？B); —？a comparison of definitions with ISO/TC 211 (see Annex？C).