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What is ERAMMP?

The Welsh Government’s Environment & Rural Affairs Monitoring and Modelling Programme (ERAMMP) follows on from the Glastir Monitoring and Evaluation Programme (GMEP) which ran from 2012 to 2016, and was set up to monitor Wales’ natural resources and to also evaluate the impacts of the Glastir scheme.  ERAMMP includes a large scale national field survey of Wales’ natural resources.

What does the ERAMMP survey do?

The ERAMMP survey will map and assess the condition of habitats including woodlands, hedges, headwaters and ponds.  Our scientists will also look at landscape quality, the state of historic features & public rights of way and the diversity of birds & pollinators. We will record short and long-term trends, over the past 40 years in some instances, building on GMEP and other previous surveys. The survey we are conducting in 2021 is not related in any way to compliance or the inspection process for the Basic Payment Scheme, Glastir, or any other Welsh Government Scheme and will not affect your current payments.

Who does the survey?

The ERAMMP fieldwork is carried out by a team of 37 experienced professional surveyors hired by UKCEH and the BTO.

Despite their already high-level of technical field skills, before the survey starts they follow a comprehensive, training programme that will cover all aspects of data-collection, health and safety, biosecurity protocols, first-aid and off-road driving.

The surveyors work in teams following detailed survey methodologies documented in field handbooks for consistency and comparability.

How is land selected?

Land survey locations are selected to ensure good coverage of all major land classes in Wales.

Land classes are defined by characteristics such as climate, geology and topography and are therefore relatively stable compared to land use and land cover which changes.

This approach ensures the survey efficiently captures a representative set of the major farm, woodland and land managed for habitat in Wales without over-sampling the more common habitats.

The survey approach also recognises that our natural resources are interdependent and impact on each other and so it is important that we are able to co-locate many measurements within the same 1 km survey squares.

Survey location mapWhere is it being done?

The map shows approximate locations of the survey squares for 2021/2022.

The GMEP monitoring sample was 300 survey-squares across Wales: 150 ‘Wider Wales’ squares and 150 ‘Targeted Squares’.

Wider Wales Squares: are sites which are representative of Wales and are independent of farm management and land cover. The areas are randomly sampled within strata according to land classifications. They aim to capture national trends, counterfactuals and key baseline comparisons.

Targeted Squares: are randomly selected within areas which score highest for Glastir Advanced payments. Squares are selected using the Welsh Government's scoring system to combine maps of Glastir priorities. Squares are chosen to map onto areas that WG have emphasised as priorities for Glastir Advanced payments.

The ERAMMP survey in 2021/2022 will revisit 130 of these original 300 squares.

When will the survey teams arrive on my land?

The surveys will be carried out between May and October in 2021 and 2022. The table below gives more details.  We will contact you before the survey to make final arrangements and discuss any other issues you might want the surveyors to know about.




Time of Day


Number of visits

Main (plants, soils and historic features)

April - Sept

9am - 6pm




April - Sept

9am - 6pm



Woodland Mapping

June - Sept

9am - 6pm




April - June

Early morning




July & August

9am - 6pm



How was I selected?

No individual person was selected. Land was chosen at random as part of GMEP and ERAMMP is re-visiting the same land.

What about privacy?

Your contact details were provided to us by the Welsh Government or Land Registry in order to conduct this survey only. We follow the highest levels of data security and confidentiality. Individuals or their landholdings are never identified when reporting the results of the survey. Please see attached letter for our Privacy Policy.

How is data quality assured?

As with all survey data, there is inevitably some variation in recording.  A Quality Assurance (QA) team focuses on preventing quality issues occurring by visiting each survey team throughout the survey period to ensure the field protocols are being followed and addressing any issues.   An independent Quality Control (QC) team identifies potential quality issues recorded by the survey teams by re-surveying 10% of the sites and  measuring the consistency and reliability of the work done within the major components of the field programme. A quantitative and predicable measure of consistency and reliability of the data is produced and used in later analysis.

Who can I contact about the survey?

If you have any questions or thoughts regarding the survey, please don’t hesitate to contact the ERAMMP Survey Office by email at erammp@ceh.ac.uk.

Learn More..

Man behind a flower close-up

Introduction and overview of the National Field Survey.

Surveyor inspecting the grass

What happens in the survey? What is looked at and collected?

Black bull face

Who does the survey and how is the data checked?

Sheep staring at camera

How do we keep the land, the animals and the people safe?


Process and procedures for the National Field Survey