Overview
EN ISO 11091:1999 (ISO 11091:1994) - Construction drawings - Landscape drawing practice - establishes general rules for preparing landscape and external works drawings and specifies the graphical symbols and simplified representations used in landscape drawing practice. The standard groups these graphical symbols and simplified representations as conventions, and Annex A lists conventions from other International Standards that are applicable to landscape drawings. EN ISO 11091 was adopted by CEN and appears in national collections (for example, SIST EN ISO 11091:2002 in Slovenia).
Key topics
- General rules for landscape drawings: principles that govern how landscape construction drawings should be presented to ensure clarity and uniformity.
- Graphical symbols and simplified representations: standardized signs and pictograms used to depict landscape elements (collectively called conventions).
- Conventions set: a defined set of graphical rules to ensure consistent depiction of features across documents and projects.
- Cross‑reference to International Standards: Annex A presents conventions from other International Standards that apply to landscape drawings, ensuring interoperability with broader technical drawing practices.
Practical applications
EN ISO 11091 is intended to improve communication, reduce ambiguity, and increase efficiency in the delivery of landscape and external works documentation. Typical uses include:
- Creating tender and construction drawings for public and private landscape projects.
- Developing consistent CAD symbol libraries and drafting templates for landscape architecture offices.
- Preparing documentation for contractors, consultants, planners, and local authorities where clear, standardized representation is required.
- Supporting quality control in drawing production and review processes to reduce misinterpretation on site.
Who benefits:
- Landscape architects and designers
- Civil engineers and urban designers involved with external works
- CAD and drafting technicians producing landscape construction documents
- Contractors, landscape contractors, and project managers reviewing drawings
Related standards
Annex A of EN ISO 11091 highlights relevant conventions from other International Standards. For full interoperability and best practice, users should consult supplementary ISO/CEN documents on technical drawing conventions and CAD standards relevant to construction and landscape documentation.
By following EN ISO 11091 conventions, organizations ensure consistent, professional, and interoperable landscape drawing practice that supports clearer communication across the design and construction workflow. Keywords: EN ISO 11091, ISO 11091, landscape drawing practice, construction drawings, graphical symbols, drawing conventions, landscape architecture standards.
