Overview - EN ISO 19144-2:2023 (Land Cover Meta Language, LCML)
EN ISO 19144-2:2023 defines the Land Cover Meta Language (LCML) as a UML metamodel for describing land cover classification systems based on physiognomic (appearance-based) attributes. Published by CEN/ISO, LCML provides a common reference structure to document, compare and integrate diverse land cover classification schemes without replacing existing national or thematic systems. The standard supports consistent metadata, semantic mapping and interoperability of land cover data across organisations and countries.
Key topics and technical requirements
- UML metamodel representation: LCML is specified as a UML metamodel to formalize classes, relationships and attributes for land cover descriptions.
- Physiognomic focus: Classification elements are defined by observable surface and vegetation characteristics rather than land use intent.
- Meta-objects and modules: The standard defines LCML objects and packages (e.g., LC_Element, LC_VegetationElement, LC_GrowthForm) and domain subtypes such as:
- LC_WoodyGrowthForm, LC_HerbaceousGrowthForm, LC_LichenAndMoss
- LC_AbioticElement, LC_ArtificialSurfaceElement, LC_NaturalSurfaceElement
- LC_WaterBodyAndAssociatedSurfaceElement, LC_BuiltUpSurface, LC_NonBuiltUpSurface, LC_RocksSurfaceElement, LC_SoilSandDepositsSurfaceElement
- Design rules and layering: Guidance on classification system design, layering of attributes and general rules for class definition to improve comparability.
- Geometric aspects & relation to land use: Discussion of geometric representation of classes and how land cover relates to land use concepts.
- Conformance classes: Defines conformance testing and classes - notably:
- Conformance class 1: Description of a Land Cover classification system
- Conformance class 2: Comparison of Land Cover classification systems
- Interoperability guidance: Mechanisms for documenting, comparing and integrating different classification schemes; reference to ISO 19144-1 where applicable.
Applications and practical value
- Data integration: Harmonize land cover datasets from different sources (national, regional, remote sensing products) for environmental monitoring, land change analysis and modeling.
- Semantic mapping: Support automated or manual crosswalks between classification schemes, improving data interoperability for GIS, remote sensing and decision-support systems.
- Documentation & metadata: Provide a structured, machine-readable description of classification systems for catalogues, inventories and spatial data infrastructures (SDIs).
- Quality assurance & comparison: Enable reproducible comparisons of mapping products and support conformance testing of classification implementations.
Who should use this standard
- GIS and remote sensing specialists, national mapping agencies, land monitoring programmes, environmental analysts, standards implementers, and software vendors building classification, cataloguing or semantic integration tools.
Related standards
- ISO 19144-1 (relation noted in the standard)
- Other ISO/TC 211 geographic information standards for metadata, data quality and interoperability.