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NRW_DS124658

Laith Metadata

English

Datganiad

GIS data provided to NRW for the PyC Windfarm project was acquired from various different sources/contractors as discussed below, but essentially is all derived from GPS surveys undertaken at various stages of the construction process: 1. Site Civils (turbine locations, track edge, crane hard-standings, culverts, coupe crossing points and all general civils detail etc. etc.): acquired by the Principal Contractor, JBBB, as part of the final 'As-built' survey undertaken post construction. A dual-frequency survey grade GPS was used, and the data was processed, and final drawings issued by Grontmij on behalf of the Principal Contractor in or around July 2018. Drawings were issued as AutoCAD dwg and converted to ArcGIS shape files to OSGB36 coordinate system/projection. 2. On-site cable arrays (33kV cabling): this was installed by subcontractor PSUK and the locations were surveyed at installation using a survey grade GPS, although there was some question about the accuracy of some sections (which may have been surveyed with a lower accuracy hand-held GPS). 3. The Grid Connection Route and Sub-Station Infrastructure: surveyed by grid connection Contractor ABB using survey grade GPS, although some discrepancies were identified when compared to civils as-built drawings. Whilst all surveys are theoretically accurate to about 0.5m (when related to OSGB/OSTN2) some uncertainties were identified: given the size of the site, the complex terrain, and the degradation of GPS in dense forestry, an overall accuracy of +/- 2m should be assumed.

Dyddiad cyfeirnod y set ddata (Cyhoeddiad)

2019-10-29

Rhychwant

Rhychwant

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RHONDDA CYNON TAF - RHONDDA CYNON TAFF

Hyd

CASTELL-NEDD PORT TALBOT - NEATH PORT TALBOT

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W

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Allweddeiriau

System Cyfeirio Gofodol

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