Hydrographic Zones — Martinique 2004 — BD Carthage

The hydrographic division is the set of four hierarchical partitions of the French territory carried out according to descending hydrographic areas: — hydrographic region (1st order), — hydrographic sector (2nd order), — hydrographic subsector (3 rd order), hydrographic area (4th order). A hydrographic region is divided into a maximum of 10 sectors. The list of hydrographic regions was adopted in Circular No. 91-50 of 12 February 1991 but the determination of their boundaries is under the responsibility of the Water Agencies. Geometry is close to the IGN BDTopo which was used for its realisation.BDCarthage Réunion is maintained by DEAL Réunion.The Carthage Réunion BD is a version validated by the SIE but not by the IGN and therefore problems of incompatibility with IGN referentials can occur (and that an update will “officialise” the Carthage BD with IGN validation).法国水文分区体系是依据水文流域层级由高至低，对法国领土开展的四级分层划分集合： —— 一级水文大区（hydrographic region，第1级） —— 二级水文分区（hydrographic sector，第2级） —— 三级水文亚区（hydrographic subsector，第3级） —— 四级水文流域（hydrographic area，第4级） 单个一级水文大区最多可划分为10个二级水文分区。 一级水文大区的名录于1991年2月12日发布的第91-50号通函中正式确立，但其边界划定工作由各流域水务机构负责。 本体系的几何数据与用于构建该体系的IGN BDTopo（法国国家地理研究院基础地形数据集）高度吻合。留尼汪迦太基数据库（BDCarthage Réunion）由留尼汪省环境与发展局（DEAL Réunion）负责维护。 该留尼汪迦太基数据库为经SIE验证、但未获得IGN验证的版本，因此可能出现与IGN参考数据集不兼容的问题（后续更新将使该数据库获得IGN验证并完成官方标准化）。