Rivers - Metropolis 2023 - BD Topage®

Dataset of rivers of metropolitan France BD Topage® version 2023

There is no standard definition of what a watercourse is. Codification of watercourses is the responsibility of the managers of the reference system (IGN-OFB-Etat in consultation with water stakeholders, in particular water agencies).
Codification choices are essentially influenced by a topographical approach, based on terrain toponymy where it exists. The criteria of drain length, flow rates, permanence of flow can be used, in the absence of clear and convergent sources on toponymy.
One of the founding roles of the repository for the water information system is to propose an identification of hydrographic objects in the form of stable, consensual codes that can be used to produce and maintain derived repositories, or to hang up business data (scrubbing stations, etc.)
The choice of the watercourse is generally not influenced by one of these particular uses, sometimes contradictory between them.

Note: The management of transboundary watercourses is as follows:
- Cases of rivers on the border (crossing the border): the geometry of it will be integrated in its entirety;
- Cases of rivers crossing the border once: a common cross-border hydrographic node will be shared between the two countries (pending clear border delimitations);
- Cases of rivers travelling back and forth between the two countries: the geometry of the latter will be integrated in its entirety for the part between its first and last A/R on the border (even for the part located in the neighbouring country).

Corresponds to the "Watercourse" concept of Inspire.

法国本土河流数据集 BD Topage® 2023版

水道（watercourse）尚无统一标准定义。水道编码工作由参考系统管理方IGN-OFB-Etat负责，该方会同水利领域利益相关方（尤其是水利机构）开展相关编码工作。

水道编码的选取原则主要基于地形学方法，优先采用现有地形地名数据；若缺乏清晰且一致的地名来源，则可采用河道长度、径流量、径流持久性等作为判定标准。

水利信息系统数据库的核心职能之一，是提出以稳定、共识性编码形式标识的水文对象，此类编码可用于生成和维护衍生数据库，或用于挂接业务数据（如净化站等）。

水道的选取通常不会受某一特定用途的影响，而不同用途之间有时会存在矛盾。

注：跨界水道的管理规则如下：
1. 国境线沿线河流（跨境河流）：其完整几何形态将被完整收录至本数据集；
2. 单次跨境河流：在明确边界划定前，两国将共享一个跨境水文节点；
3. 往返穿越两国的河流：将完整收录该河流在国境线上首次与末次过境点之间的全部河段（即便该河段位于邻国境内）。

本数据集符合欧盟空间信息基础设施（INSPIRE）的"水道（Watercourse）"概念定义。