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Background Notes

Background Notes

Online ISSN: 2009-5163
CSO statistical release, , 11am

What you should know about these Ecosystem Extent Accounts

What are the Ecosystem Accounts?

The System of Environmental Economic Accounting - Ecosystem Accounting (SEEA-EA) is a spatially-based, integrated statistical framework for organising biophysical information about ecosystems, measuring ecosystem services, tracking changes in ecosystem extent and condition, valuing ecosystem services and assets and linking this information to measures of economic and human activity. It is an integrated statistical framework adopted by the United Nations Statistical Commission.

The SEEA-EA outlines five sets of ecosystem accounts:

  1. Ecosystem extent accounts
  2. Ecosystem condition accounts
  3. Ecosystem services (physical flow)
  4. Ecosystem services (monetary flow)
  5. Monetary ecosystem asset accounts

As part of a recent amendment to Regulation (EU) No 691/2011 on environmental economic accounts, it will be mandatory to report ecosystem extent, condition and services (physical flow) accounts in line with SEEA-EA. The monetary flow of ecosystem services and the monetary value of ecosystem assets will not need to be accounted for under the new regulation. Mandatory reporting by member states will commence in 2026.

How do these accounts compare to the previously published Extent Accounts?

The ecosystem extent accounts published in October 2023 were experimental statistics and covered the period from 2000 to 2018. The accounts published here, which cover the period between 2018 and 2021, differ to the previous accounts in three fundamental ways:

  • Number of ecosystems covered: The previous accounts covered all 12 ecosystems (including Marine) at level one of the new EU Ecosystem Typology (Table 5.1). By contrast, these accounts exclude Marine but cover most transitional and terrestrial ecosystem types at level two of the typology (Table 5.1). Excluding ecosystems which are not present in Ireland and ecosystems for which – at the time of publishing – data could not be sourced, this results in an overall increase of 12 to 30 ecosystem types.
  • Source data: The previous accounts were based on CORINE Land Cover (CLC), whereas the base land cover for these accounts is CLCplus Backbone. This is the next generation baseline landcover product produced by the Copernicus Land Monitoring Service (CLMS). The decision to use CLCplus Backbone over CLC is primarily due to the uncertainty around the future of CLC following its planned 2024 iteration. In addition, CLCplus also has a far superior resolution (10 × 10 m) compared to the 25-hectare minimum mapping unit (MMU) of CLC. The new accounts also incorporate a range of national survey and administrative data sets, as well as several data layers produced by Copernicus as part of their new High-Resolution Layer – Vegetated Land Cover Characteristics (HRL-VLCC) portfolio. These data are crucial for mapping of ecosystems which would not be identifiable using CLCplus Backbone alone. Finally, compared with CLC (released every six years), CLCplus Backbone, HRL-VLCC and most of the national data are produced at a frequency which satisfies the mandatory three-year reporting frequency for ecosystem extent accounts.
  • Detail: As the previous accounts were based on CLC, ecosystems with an area of less than 25 hectares were not accounted for. The new accounts have been estimated from a compiled ecosystem extent map with an MMU of 1 ha for all ecosystems except for Natural & Semi-Natural Grasslands (which has an MMU of 25 ha as it is still mainly sourced from CLC). This means ecosystems occurring at a considerably smaller scale are now included.
Table 5.1 Description of EU ecosystem typology level two
Ecosystem type (Level 1)Ecosystem type (Level 2)Description
1. Settlements & Other Artificial Areas 1.1 Continuous Settlement Area

Also designated as continuous urban area or fabric. The Continuous Settlement Area type is assigned when settlement structures and transport networks are dominating the surface area. At least 80% of the land surface in the ecosystem asset is covered by impermeable features such as buildings, roads and artificially surfaced areas.

1.2 Discontinuous Settlement Area

Also designated as discontinuous urban area or fabric. The Discontinuous Settlement Area type is assigned when settlement structures and transport networks associated with vegetated areas and bare surfaces are present and occupy significant surfaces in a discontinuous spatial pattern. The impermeable features such as buildings, roads and artificially surfaced areas range from 30 to 80 % land coverage in the ecosystem asset.

1.3 Infrastructure & Industrial Areas

This includes land used for transport infrastructure such as roads, airports and ports, including associated areas (e.g. planted trees and bushes lines or spontaneous vegetation, such as grass verges), and artificial areas other than buildings that are used for commercial and industrial purposes including extraction sites, dump areas, and construction sites.

1.4 Urban Greenspace Areas with vegetation within or partly embraced by urban fabric. This class is assigned for urban greenery, which usually has recreational or ornamental character and is usually accessible for the public. Includes small urban water bodies. Areas with soil sealing above 30% should be moved to class 1.1 or 1.2.
1.5 Other Artificial Areas

Areas that are artificial but do not fall under the other level 2 categories of settlements and artificial areas. This includes e.g. permanent green houses, cemeteries even if predominantly green. Countries should also record here types of artificial land of specific national importance, such as archaeological sites or others, if they do not belong to any of the level 2 categories 1.1 -1.4. Countries should inform what they cover in this category in a footnote in the questionnaire.

2. Cropland 2.1 Annual Cropland

Cropland planted for annually or regularly harvested crops other than those that carry trees or shrubs. They include fields of cereals, of sunflowers and other oil seed plants, of beets, legumes, fodder, potatoes, and other forbs. Croplands comprise intensively cultivated fields, fallow land, temporary grass for silage and grazing as well as traditionally and extensively cultivated crops with little or no chemical fertilisation or pesticide application. Faunal and floral quality and diversity depend on the intensity of agricultural use and on the presence of borders of (semi-)natural vegetation and woody structures between fields. Includes non-permanent greenhouse installations such as film tunnels. Small semi-natural elements which are associated with agricultural land use, such as hedges, ponds, grassy margins etc., are considered part of this ecosystem type.

2.2 Rice Fields

Inundated or inundatable fields used for the cultivation of rice (Oryza sativa). When not too heavily treated, they may provide substitution habitats for some wetland species, for example resident birds (e.g. ducks, rails and herons) and as feeding grounds for migratory birds.

2.3 Permanent Crops

Crops not under a rotation system which provide repeated harvests and occupy the land for a long period before they are renewed. Mainly plantations of woody crops, e.g. vineyards, fruit and berry plantations, olive groves. Excludes pastures, grazing lands and forests. Small semi-natural elements which are associated with agricultural land use, such as hedges, ponds, grassy margins etc., are considered part of this ecosystem type. Includes burnt areas of this type.

2.4 Agro-Forestry Areas

Crops combined with scattered tree stands, with a canopy cover, in general, between 10% and 30%. A typical expression are the Iberian dehesas and montados. Includes burnt areas of this type.

2.5 Mixed Farmland

Also designated as heterogeneous agricultural areas. Includes: Non-permanent crops (arable lands) associated with permanent crops on the same plot of farmland; juxtaposition or mosaics of small parcels of diverse annual crops, pasture/grassland and/or permanent crops; areas principally occupied by agriculture, interspersed with significant natural areas; and annual crops or grazing land under the wooded cover of forestry species (i.e., agroforestry). Characteristic is that none of these land cover types is dominant in the given unit. Small semi-natural elements which are associated with agricultural land use, such as hedges, ponds, grassy margins etc., are considered part of this ecosystem type. Includes burnt areas of this type.

2.6 Other Farmland

Other types of farmland not included in the other categories of cropland such as nurseries, Christmas tree plantations and bioenergy grasses and short rotation coppice. Small semi-natural elements which are associated with agricultural land use, such as hedges, ponds, grassy margins etc., are considered part of this ecosystem type.

3. Grassland 3.1 Sown Pastures & Other Grass (Modified Grasslands)

Stable grassland characterised by agricultural use or strong human disturbance. Floral composition dominated by Graminaceae and shaped by human activity. Regularly re-sown and fertilised and used for grazing or mechanical harvesting of grass. Small semi-natural elements which are associated with agricultural land use, such as hedges, ponds, grassy margins etc., are considered part of this ecosystem type.

3.2 Natural & Semi-Natural Grasslands

Grasslands under no or moderate human influence. Mostly low productivity grasslands composed of native species adapted to the local environment. Can be under agro-forestry use. Often situated in areas of rough, uneven ground, steep slopes or wetter areas; frequently including rocky areas or patches of other (semi-)natural vegetation. Small semi-natural elements which are associated with agricultural land use, such as hedges, ponds, grassy margins etc., are considered part of this ecosystem type. Includes burnt areas of this type.

4. Forest & Woodland 4.1 Broadleaved Deciduous Forest

Woodlands and forests dominated by summer-green non-coniferous trees that lose their leaves in winter. Includes woodland with mixed evergreen and deciduous broadleaved trees, provided that the deciduous cover exceeds that of evergreens. The proportion of conifers should not exceed 25%. Includes burnt areas of this type.

4.2 Coniferous Forests

Vegetation formation composed principally of trees, including shrub and bush understory, where coniferous species predominate. The proportion of deciduous trees should not exceed 25%. Includes burnt areas of this type.

4.3 Broadleaved Evergreen Forest

Forests dominated by broadleaved sclerophyllous or lauriphyllous evergreen trees, or by palms. They are characteristic of the Mediterranean and warm-temperate humid zones. Sporadic grazing use may occur. Includes burnt areas of this type.

4.4 Mixed Forests

Vegetation formation composed principally of trees, including shrub and bush understorey, where neither broadleaved nor coniferous species strongly predominate (i.e. <75% deciduous and <75% coniferous trees). Includes burnt areas of this type.

4.5 Transitional Forest & Woodland Shrub

Transitional forests and woodland shrub. Includes vegetation that is always shrubland and areas of temporarily cleared forest (as part of forest management). Sporadic grazing use may occur. Includes burnt areas of this type.

4.6 Plantations

Monoculture plantations or plantations strongly dominated by one or few species of non-European coniferous and broadleaved trees with very sparse or lacking undergrowth, e.g. eucalyptus plantations. Forest stands of single or mixed species consisting of native and/or non-native trees species that have long been established in European ecosystems and have diverse undergrowth typical for forest ecosystems should be classified as part of types 4.1 to 4.4. If not possible to distinguish plantations, these areas should be attributed to the classes 4.1 – 4.4. Includes burnt areas of this type.

5. Heathland & Shrub 5.1 Tundra

Vegetated land with graminoids, shrubs, mosses or macro lichens overlying permafrost. European tundras are limited to Spitzbergen and northern Russia. Vegetation with the same species also occurs on boreal mountains and in the low arctic remote from the main permafrost region, notably in Fennoscandia and Iceland; these oroboreal and low arctic habitats are listed under alpine and subalpine grassland or arctic, alpine and subalpine shrub.

5.2 Scrub & Heathland

Vegetation with low and closed cover, dominated by bushes, shrubs, dwarf shrubs (heather, briars, broom, gorse, laburnum etc.) and herbaceous plants, including semi-natural/successional stages and mature stages of development. Includes burnt areas of this type.

5.3 Sclerophyllous Vegetation

Bushy sclerophyllous vegetation including semi-natural/successional stages and mature stages of development; including maquis, matorral and garrigue. Includes burnt areas of this type.

6. Sparsely Vegetated Ecosystems 6.1 Bare Rocks

Scree, cliffs, rock outcrops, including areas of active erosion, rocks and reef flats outside marine influence, inland salt planes. At least 90% of area of the ecosystem asset is covered by rocks. Rocks within a zone up to 100m from the high-water mark can be classified as coastal ecosystems.

6.2 Semi-Desert, Desert & Other Sparsely Vegetated Areas

Non-coastal habitats with less than 30% vegetation cover (other than in crevices of rocks, screes or cliffs) which are characterised by very low water availability. They include areas which are sparsely vegetated due to land degradation.

6.3 Ice Sheets, Glaciers & Perennial Snowfields

High mountain zones and high latitude land masses occupied by glaciers or by perennial snow. They may be inhabited by algae and invertebrates.

7. Inland Wetlands 7.1 Inland Marshes & Other Wetlands On Mineral Soil

Low-lying land usually flooded in winter, and more or less saturated by water all year round. Vegetation is composed mainly of rushes, sedges, and some reed and shrub. Other types of this class include reedbeds and springs.

7.2 Mires, Bogs & Fens

Wetlands, with the water table at or above ground level for at least half of the year, dominated by mosses, herbaceous or ericoid vegetation. Includes inland saltmarshes and water ogged habitats where the groundwater is frozen. Excludes the water body and rock structure of springs and waterlogged habitats dominated by trees or large shrubs. Includes bog degradation stages dominated by heathland but excludes wet heathlands on mineral soils which support limited peat formation. Includes peat extraction sites. Includes burnt areas of this type.

8. Rivers & Canals 8.1 Rivers & Streams

Natural watercourses, such as rivers, streams etc. (even though often modified by man) serving as water drainage channels.

8.2 Canals, Ditches & Drains

Artificial watercourses serving as water drainage or transport channels.

9. Lakes & Reservoirs 9.1 Lakes & Ponds

Natural (but sometimes modified) water bodies with presence of standing water surface during the entire year (except in very dry years for some types).

9.2 Artificial Reservoirs

Artificial water bodies with presence of standing water surface during most of the year. Developed mainly for water supply or energy generation purposes.

9.3 Geothermal Pools & Wetlands (Iceland)

Hot springs, geysers, mud pots and associated wetlands resulting from interactions of deeply circulating groundwater with magma and hot rocks that produce chemically precipitated substrates. They support a specialised but low diversity biota structured by extreme thermal and geochemical gradients.

10. Marine Inlets & Transitional Waters 10.1 Coastal Lagoons

Stretches of salt or brackish water in coastal areas which are separated from the sea by a tongue of land or other similar topography. These water bodies can be connected to the sea at limited points, either permanently or for parts of the year.

10.2 Estuaries & Bays

This class includes two main types: a) estuaries, i.e., the mouth of a river under tidal influence within which the tide ebbs and flows. b) bays, i.e., a coastal body of water partly enclosed by land and that directly connects to a larger main body of water, in particular a sea or ocean. Vegetation, and fauna is adapted to saline and/or brackish conditions. It is recommended to align the border between marine waters, estuaries and river mouths in agreement with Marine Strategy Framework Directive reporting.

10.3 Intertidal Flats

Coastal zone under tidal influence between open sea and land, which is flooded by sea water regularly twice a day in a ca. 12 hours cycle. Defined by the area between the average lowest and highest sea water level at low tide and high tide. Generally non-vegetated expanses of mud, sand or rock lying between high and low water marks.

11. Coastal Beaches, Dunes & Wetlands 11.1 Artificial Shorelines

Man-made dykes and dams, including wave breakers extending into the sea, constructed primarily to protect land from seawater, but sometimes also used for roads. Deposited or dumped artificial structures in the coast may attract marine biota that would not otherwise occupy such locations. Excludes transport infrastructure on the shore such as ports and seaside promenades that should be recorded in Settlements & Other Artificial Areas.

11.2 Coastal Dunes, Beaches & Sandy & Muddy Shores

Natural non-vegetated expanses of sand or pebble/gravel, in coastal locations, like beaches, dunes, gravel pads, muddy shores. Including salt-influenced wetlands between rows of dunes.

11.3 Rocky Shores

Scree, cliffs, rock outcrops, including areas of active erosion, rocks and reef flats situated above the high-water mark up to a distance of 100 m away from the high water mark.

11.4 Coastal Saltmarshes & Salines

This class includes two main types: a) Coastal saltmarshes, which are vegetated low-lying areas in the coastal zone, mostly above the high-tide line, but always susceptible to flooding by seawater. Often in the process of being filled in by coastal mud and sand sediments, gradually being colonized by halophilic plants. b) Salt-pans for extraction of salt from salt water by evaporation, under active use or in process of abandonment. Actively exploited salines can have a rather artificial character whereas those no longer in use often have developed substantial ecological value.

Data

The ecosystem extent accounts reported in this release were produced using compiled ecosystem extent maps for 2018 and 2021. These maps were created using a wide range of EU and national level geospatial data (Table 5.2). Detailed information on how this data was classified and crosswalked to the EU ecosystem typology can be found in the methodology document in the methodology section of this release.

Base land cover

The base land cover on which these ecosystem accounts are based was CLCplus Backbone (2018 and 2021 versions) from the Copernicus Land Monitoring Service (CLMS).

Other European data

High-Resolution Layer – Vegetated Land Cover Characteristics (HRL-VLCC) – Crop Type from the CLMS were used to map the Cropland ecosystem type. CLMS Ploughing indicator and Grassland Mowing Events data were used in the mapping of Natural & Semi-Natural Grasslands. For information on how these data were applied, see the methodology document in the methodology section of this release.

National data

The following national data, which are also listed in Table 5.2, were used for the accounts presented in this release:

  • PRIME 2 – DLM Core: The national cadastral map (also known as ‘PRIME 2’) from Tailte Éireann was the main data source used for mapping terrestrial ecosystem types which are primarily characterised by artificial surfaces (Settlements & Other Artificial Areas) or water (Rivers & Streams and Lakes & Ponds). PRIME 2 was not used directly – instead, the Digital Landscape Models (DLM) Core Data was used, which is derived from it.
  • Land Parcel Identification System (LPIS): The Land Parcel Identification System (LPIS) database, which contains crop type descriptions for over 1.3 million farm parcels, was used to classify both Grassland and Cropland ecosystem types. LPIS is used by the Department of Agriculture, Food and the Marine (DAFM) to administer payments to farmers under area-based schemes such as the Basic Income Support for Sustainability (BISS), and the Areas of Natural Constraint Scheme (ANC).
  • Article 17 – EU Habitats Directive data: Grassland habitats mapped as part of reporting under Article 17 of the EU Habitats Directive were used for mapping of Natural & Semi-Natural Grassland. These were accessed here.
  • Forest administrative data: Administrative data from the Department of Agriculture, Food and the Marine (DAFM) and Coillte were used as the main data sources for different Forest & Woodland ecosystem types.
  • Forest survey data: Two forest survey datasets from the NPWS were used as data sources for Broadleaved Deciduous Forest. These were the National Survey of Native Woodlands (NSNW) and the Ancient and Long-established Woodland (ALEW) survey.
  • EU Water Framework Directive transitional waters: The Transitional Waterbodies data reported by the Environmental Protection Agency (EPA) under the Water Framework Directive (WFD) were used as data sources for Coastal Lagoons and Estuaries & Bays.

Boundaries

Several boundaries – some of which are listed in Table 5.2 – were used to delinate the ecosystem accounting area and to characterise certain ecosystem types:

  • Ecosystem accounting area: The ecosystem accounting area (EAA) used in this release delineated the marine EAA from the terrestrial and transitional EAA. It was developed by the CSO and draws from range of different data sources. The production of the EAA and its source data are detailed in the methodology document accompanying this release.
  • County Local authority boundaries: Spatial disaggregation of the compiled ecosystem extent map to the level of each local authority was done using the local authority and county boundaries generated from the 2024 National Statutory Boundaries from Tailte Éireann.
  • Other boundaries: Other boundaries used to produce these accounts included those which separated coastal from inland ecosystems, and built-up urban areas from rural areas. The latter were the CSO Census 2022 Urban Boundaries and Built Up Areas and otherwise both boundaries are described in detail in the release’s methodology document.
Table 5.2 Data sources used to classify ecosystem extent maps for 2018 and 2021
Data nameSourceData structureReference years (for these accounts)Update frequency
CLCplus Backbone Copernicus raster 2018, 2023 two years
High resolution layer (HRL)-vegetated land cover characteristics (VLCC) – Crop Types Copernicus raster 2018, 2023 annual
High resolution layer (HRL)-vegetated land cover characteristics (VLCC) – Ploughing Copernicus raster 2018, 2023 annual
High resolution layer (HRL)-vegetated land cover characteristics (VLCC) – Mowing Copernicus raster 2018, 2023 annual
CORINE Land Cover (CLC) Copernicus raster 2018 six years
PRIME2 - DLM Core cadastral map Tailte Éireann vector 2018 Q1, 2021 Q4 quarterly
National Land Cover Map (NLCM) Tailte Éireann vector 2018 six years
CSO Built Up Urban Areas CSO vector 2022 reviewed with every Census cycle
Water Framework Directive (WFD) - Transitional Waterbodies EPA vector 2018, 2021 six years
Land Parcel Identification System (LPIS) DAFM vector 2018, 2021 annual
Forest administrative data (1) DAFM vector 2018, 2021 annual
Forest administrative data (2) Coillte vector 2018, 2021 annual
National Survey of Native Woodlands (NSNW) NPWS vector 2003-2008 once-off
Ancient and Long-Established Woodland (ALEW) NPWS vector 2010 once-off
Article 17 Grasslands NPWS vector 2019 six years

Ecosystem classification and mapping

All national data were converted from vector to raster data format, which was the format used by the CLCplus Backbone base land cover map. National data were also all re-projected from the Irish Transverse Mercator (ITM) projection to the European Lambert Azimuthal Equal Area (LAEA) projection – this was the projection used by CLCplus Backbone and was selected due to its suitability for statistical mapping. All rasterised source data were compiled into source land cover maps before aggregating from 10 × 10 m2 to 100 × 100 m2 (1 hectare). The final ecosystem type label assigned to each 1-hectare pixel was based on that which was the most common within the 1-hectare space. Given that most of the time, the frequency of the most common ecosystem type was 1, the MMU may also be regarded as 1 hectare (but never greater). The exception to this was Natural & Semi-Natural Grassland, which can be regarded as having an MMU of 25 hectares – this is because the main source for this data was CLC. See the methodology document for a more detailed breakdown of the mapping and classification workflow. For a more detailed breakdown of the mapping and classification workflow, see the methodology document in the methodology section of this release.

Validation and accuracy

Validation

The source land cover maps used to map and classify the final ecosystem extent maps were validated using the Land Use-Land Cover Area Frame Survey (LUCAS) sample points published by Eurostat. This validation approach is described in detail in the methodology document. The compiled source land cover maps for 2018 and 2021 had overall accuracies that can be described has substantial and moderate, respectively. This was evidenced by values for Cohen’s kappa (an accuracy statistic which is suitable for imbalanced data, such as land cover maps), which were 0.6238 and 0.5545, respectively. A more detailed breakdown of these results, including measures for different land cover classes, is provided in the methodology document in the methodology section of this release.

Accuracy

Values for accuracy were calculated for each level one and level two ecosystem type based on the median frequency of ecosystem assignment to each mapped 1-hectare pixel from the underlying source land cover map. These values inform the maximum level of accuracy to expected for each ecosystem type pixel in the final classified ecosystem extent map. Accuracy was generally greatest for ecosystem types which occurred as large, homogenous arial phenomena (e.g. Lakes & Ponds and Intertidal Flats) and lowest for ecosystem types characterised by linear arial features such as roads (i.e. Infrastructure & Industrial Areas) and rivers (i.e. Rivers & Streams). They were also generally lower for ecosystem which are more interspersed with other ecosystems, such as those characterised by artificial surfaces in remote and rural locations (i.e. Discontinuous Settlement Area). The results of this accuracy assessment can be found in the methodology document in the methodology section of this release.

Other information

For additional information on planned future updates and examples of non-intuitive ecosystem conversions, see the methodology document accompanying this release. For information on coherency with other official data and statistics, please see the quality report which is also associated within this release. Both documents can be found in the methodology section of this release.