Dull adnabod

Dynodydd

NRW_DS112402

Teitl Amgen

• Cyngor Cefn Gwlad Cymru 2010, Haen hyder amrywiaeth rhywogaethau rhynglanwol
• intertidal_confidence

Laith Metadata

English

Datganiad

Species information was collated from CCW and the National Biodiversity Network Gateway (Marine Recorder Snapshot from the Joint Nature Conservation Committee, JNCC). MarLIN databases and any additional data holdings within the Data Archive for Seabed Species and Habitats data (DASSH) were also used. Confidence ratings based on the quality and quantity of data used in the final analysis were calculated for each hexagonal unit to provide users with a view of the underlying data when examining hotspot occurrence. A confidence rating was calculated using a three point categorical scale from high to low. The average quality for each hexagon was calculated by assigning numerical values to each sample (high, medium and low were allocated 3, 2 and 1 respectively) and then the mean for each hexagon was calculated. The sample counts per hexagon were also aggregated into high, medium and low, using the natural breaks classification. Once the high, medium and low values were calculated for each hexagon, confidence was calculated using the matrix a confidence matrix (see additional information). An assessment of the suitability of species data was carried out, taking into account the source of the data, its age, spatial, taxonomic and methodological accuracy. Data were also graded on survey quality using the following three categories with respect to field surveyors: professional and academic; volunteer with expert ID; and volunteer. Derived confidence ratings were recorded in the metadata and low quality data were flagged and removed from subsequent analyses.

Dyddiad cyfeirnod y set ddata (Cyhoeddiad)

2010-03-31

Rhychwant

Rhychwant

Hyd

Wales (WLS)

N

W

E

S

 

Dosbarthiad

Ansawdd

Allweddeiriau

System Cyfeirio Gofodol

Cynnwys

Cyfyngiadau