Catalogue GéoSAS
Observations of strata and overlying layers in the quadrats associated with riparian vegetation monitoring stations - Sélune Observatory
The study of riparian vegetation is based on the observation of natural plant communities spontaneously colonizing newly exposed areas following the erasure of the Vezins and La-Roche-Qui-Boit dams.
The vegetation monitoring system includes two complementary approaches:
i) a vegetation sampling method based on floristic surveys (composition & structure) carried out within a series of quadrats positioned along a transect
ii) a monitoring of the vegetation units (UV) observed within the valley
This dataset specifically concerns the overall characterization observed on each quadrat in terms of strata and concerns only the Sélune Observatory (2021-2026).
The sampling monitoring system is based on measurements distributed at different points in space (longitudinally and laterally). It aims to identify the diversity of flora and vegetation and describe the structure of emerging formations and plant communities within the neo-valley. Implemented annually (sub-annual only for 2021, before dismantling), this monitoring aims to identify and characterize the evolution trajectories of these vegetation over time.
The vegetation sampling protocol is implemented at several stations located along the course of the Sélune and at the mouth of several tributaries located in the right-of-way of the two former reservoirs. The sample of stations is supplemented by a batch of stations positioned outside the right-of-way of the two former reservoirs, downstream and upstream, which constitute so-called "reference" stations.
For each station, a transect is established perpendicular to the channel, from the bank to a reference point located at the level of the former water reservoir (i.e. 60m NGF for Vezins & 28.5m NGF for LRQB). Along this transect, 25m2 (5mx5m) quadrats are positioned according to previously set distance intervals. These quadrats (named Q1 to Q1+n) constitute the elementary unit within which abiotic (slope, texture...) and biotic (composition, structure) parameters are characterized and evaluated. The number of quadrats sampled per station varies depending on the width of the exposed bank (or transect length). It is completed by a reference quadrat, located beyond this maximum value (named Q0).
The inventory of vascular flora, i.e. herbaceous and woody plant species within the quadrats, aims to be exhaustive and to identify them up to the specific or even sub-specific rank.
The overall characterization mentioned mainly concerns, for each quadrat, the type of soil encountered (see attribute dictionary), the slope (see attribute dictionary), the proportions of water cover, bare soil, and litter, as well as, for each of the 6 defined strata (see attribute dictionary): the considered height limits, the maximum and average height, and the proportion of overlap (relative to the 25m2 of the quadrat).
This layer gives, for each monitoring quadrat of vegetation sampling from 2021 to 2026, the following information:
– Quadrat information (id, code, number and distance from its centroid to the station reference point),
– Campaign information (id, code, date, campaign),
– Station information (code, name, protocol applied, number of quadrats, code for the associated Sélune reference point and, as a result, positioning on the catchment area, distance to sea, distance to source and watercourse, watercourse reference altitude)
– Information on the transect by campaign (number and length, X, Y, LON, LAT coordinates of the reference points “NGF” and end point “bank”)
– Information concerning the strata (identified or not), soil typology, water, bare and litter coverings, as well as details for each stratum (name of stratum ‘muscinal’, “herbaceous”, “young plant shrub,” “low shrub', “high shrub” and “arborescent, the height limits of the stratum, the associated overlap, the maximum and average heights of the stratum)
– “Point” geometry (default) corresponding to the transect reference point
Simple
- Date ( Creation )
- 2026-06-22T00:00:00
- Edition
- 2025
- Identifier
- fr-18007003900276-umrsas-selune-v_bioc_vegriv_stra_obs_qua_vegriv
- Purpose
- The purpose of this layer is to identify riparian vegetation monitoring stations and their associated riparian vegetation plots, organized by data collection campaign, as part of the Sélune Observatory, as well as observations of vegetation strata.
- Status
- Under development
- Maintenance and update frequency
- As needed
- Maintenance note
- Last update : 29/05/2026
- Keywords ( Place )
-
- Données ouvertes
- Dam removal
- INSPIRE themes INSPIRE themes ( Theme )
-
- Selune river
- Normandy
- France
- Thésaurus INRAE Thésaurus INRAE ( Theme )
-
- ecological restoration
- dam
- dynamique de la végétation
- vegetation
- GEMET GEMET ( Theme )
-
- environment
- biology
- flora (biology)
- Use limitation
- Usage libre sous réserve des mentions obligatoires sur tout document de diffusion : "Source : UMR DECOD INRAE - Agrocampus Ouest"
- Use limitation
- Licence ouverte : https://www.etalab.gouv.fr/licence-ouverte-open-licence
- Access constraints
- Other restrictions
- Use constraints
- License
- Other constraints
- Pas de restriction d’accès public
- Spatial representation type
- Vector
- Denominator
- 25000
- Metadata language
- fre
- Topic category
-
- Environment
- Description
- Secteur hydrographique "I9" (correspondant à la Sélune de sa source à l'embouchure)
))
- Begin date
- 2021-05-19
- End date
- 2025-07-09
- Reference system identifier
- RGF93 / Lambert-93 (EPSG:2154)
- Geometric object type
- Point
Distributor
- Name
- ESRI Shapefile
- Version
- 1.0
- OnLine resource
-
selune:v_bioc_vegriv_stra_obs_qua_vegriv
(
OGC:WMS
)
Observations de strates et de recouvrements sur les quadrats associés aux stations de suivi de la végétation rivulaire - Observatoire Sélune
- OnLine resource
- Download in Shapefile format ( WWW:DOWNLOAD-1.0-http--download )
- OnLine resource
- Observatoire Sélune - La végétation des berges ( WWW:LINK-1.0-http--link )
- OnLine resource
- Download in CSV format ( WWW:DOWNLOAD-1.0-http--download )
- OnLine resource
- Télécharger au format JSON ( WWW:DOWNLOAD-1.0-http--download )
- OnLine resource
- Rapport d'activité Observatoire des biocénoses aquatiques de la Sélune 2019-2021 ( WWW:LINK-1.0-http--link )
- OnLine resource
- Observatoire des biocénoses aquatiques de la Sélune - rapport d'activités 2022 ( WWW:LINK-1.0-http--link )
- OnLine resource
- Observatoire des biocénoses aquatiques de la Sélune - rapport d’activités 2023 ( WWW:LINK-1.0-http--link )
- OnLine resource
- Rapport d'activités 2024 de l'Observatoire des biocénoses aquatiques de la Sélune ( WWW:LINK-1.0-http--link )
- OnLine resource
- Rapport d'activités 2025 de l'Observatoire des biocénoses aquatiques de la Sélune ( WWW:LINK-1.0-http--link )
- Hierarchy level
- Dataset
Conformance result
- Date ( Publication )
- 2026-05-29
- Pass
- No
- Statement
-
The tracking stations were located using a hiking GPS (planimetric accuracy expected <= 20 m).
i) Sampling monitoring:
The sampling monitoring system is based on measurements distributed at different points in space (longitudinally and laterally). It aims to identify the diversity of flora and vegetation and describe the structure of formations and emerging plant communities within the neo-valley. Implemented annually (sub-annual only for 2021, before dismantling), this monitoring aims to identify and characterize the evolution trajectories of these vegetation over time.
The vegetation sampling protocol is implemented at several stations located along the course of the Sélune and at the mouth of several tributaries located in the right-of-way of the two former reservoirs. The sample of stations is supplemented by a batch of stations positioned outside the right-of-way of the two former reservoirs, downstream and upstream, which constitute so-called "reference" stations.
For each station, a transect is established perpendicular to the channel, from the bank to a reference point located at the level of the former water reservoir (i.e. 60m NGF for Vezins & 28.5m NGF for LRQB). Along this transect, 25m2 (5mx5m) quadrats are positioned according to previously set distance intervals. These quadrats (named Q1 to Q1+n) constitute the elementary unit within which abiotic (slope, texture...) and biotic (composition, structure) parameters are characterized and evaluated. The number of quadrats sampled per station varies depending on the width of the exposed bank (or transect length). It is completed by a reference quadrat, located beyond this maximum value (named Q0).
In the field, once the structure of the station has been established: location of the GPS reference point and definition of the transect, each quadrat is also defined by 4 visual markers. The soil typology, slope, general characterization (water, bare soil, litter) as well as for the 6 vegetation strata is carried out and annotated on a field sheet. Then, the species are sampled before moving on to the next quadrat.
The dataset built from these data acquired in the field is supplemented by reference information retrieved from the dataset "Ponctuel référentiel hydrographique du programme scientifique Sélune" (association of each station with a reference point that allows retrieving the positioning on the catchment area, the reference altitude at the watercourse level and not at the station, the watercourse, as well as distances to the sea and to the source).
For more information on the content of the dataset, refer to the attribute dictionary.
gmd:MD_Metadata
- File identifier
- 1e71a654-c8e8-4d22-9283-124694031238 XML
- Metadata language
- fre
- Character set
- UTF8
- Parent identifier
- Sélune biotic and abiotic observatory e91b4cb1-252d-4ae9-bdf4-24366af7a87c
- Hierarchy level
- Dataset
- Date stamp
- 2026-09-03T14:01:32
- Metadata standard name
- ISO 19115
- Metadata standard version
- 1.0
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