The Environment and Rural Affairs Monitoring and Modelling Programme (ERAMMP) National Field Survey (NFS) re-surveyed 224 of the original 300 1km squares between 2021 and 2023.
Ail-arolygodd Arolwg Maes Cenedlaethol Rhaglen Monitro a Modelu Materion Gwledig a’r Amgylchedd (ERAMMP) 224 o'r 300 sgwâr 1km gwreiddiol rhwng 2021 a 2023.