Map Viewing Service (WMS) of the dataset: Departmental inventory of rivers in Finistère — Current year

29542 polylines representing the departmental inventory of rivers in Finistère to December 2020, as annexed to Prefectural Decree 2011-1057 of 18/07/2011, updated.

This inventory is described in particular on:
http://finistere.gouv.fr/Politiques-publiques/Environnement-risques-naturels-et-technologiques/Police-de-l-eau/Inventaire-departemental-des-cours-d-eau-du-Finistere

The inventory is a composite work consisting of additions, modification and removal of elements from the stream layer of the BD TOPO IGN (C), up to about 20 % of the 2011 line. Following a tripartite agreement IGN, Chamber of Agriculture of Finistère, DDTM of Finistère, BD TOPO incorporated a large part of these elements. Then, the TOPO BD and the departmental inventory evolved slightly separately, due to the parties’ difference in point of view: IGN on the one hand, DDTM/CA29 on the other, on what a river is in the geographical sense (IGN point of view) and within the meaning of the Water Act (departmental inventory point of view), and on attributes.
Thus, the sum of the river lengths of the TOPO BD is 9 869 km, compared with 9455 in the inventory, the differences being mainly due to these differences in definition: fictitious extension in estuaries and water bodies, nozzle or nozzle streams, groundwater or surface streams, etc.

Since the hydro theme of the TOPO BD is now open-data, the departmental inventory, which differs to less than 1 %, can now also be offered on GeoBretagne, which was not possible previously for licensing problems.

29542条多段线（polylines），对应截至2020年12月的菲尼斯泰尔省河流部门清单，该清单为2011年7月18日第2011-1057号省法令的附件并经更新。

该清单的详细信息可参阅：
http://finistere.gouv.fr/Politiques-publiques/Environnement-risques-naturels-et-technologiques/Police-de-l-eau/Inventaire-departemental-des-cours-d-eau-du-Finistere

本清单为复合成果，由对BD TOPO IGN（C）的水系图层进行增补、修改与移除操作形成，涉及2011年版本图层约20%的内容。根据IGN、菲尼斯泰尔省农业商会与菲尼斯泰尔省DDTM的三方协议，BD TOPO吸纳了其中大部分要素。此后，BD TOPO与本部门清单因各方视角差异出现小幅分化：一方面是IGN的地理定义视角，另一方面是DDTM/CA29（CA29即菲尼斯泰尔省农业商会）的《水法》定义视角，二者在河流的地理范畴、法律范畴以及属性字段上均存在分歧。

因此，BD TOPO的河流总长度为9869千米，而本部门清单的河流总长度为9455千米，二者差异主要源于上述定义分歧：河口与水体的虚拟延伸段、分流或细流、地下河或地表河等。

鉴于BD TOPO的水文主题图层现已开放数据，且本部门清单与BD TOPO的差异不足1%，因此该清单如今也可在GeoBretagne平台发布——此前因授权问题无法实现这一点。