← highway ontologyHighway Asset › Ground and Geotechnical System
Existing Ground Surface
highway.ground_system.existing_grounddraftEdit
Definition
Natural ground line before construction, used as the earthwork datum.
- Class kind
- component
- Abstract
- no
- Depth
- 2
- Origin
- reference source
- Ontology
- engineering-reference-book.highway v0.1.0
- Aliases
- OGL, Original Ground Level, NGL
- Abbreviations
- OGL, NGL
- Last changed
- 7/27/2026, 2:50:06 PM
Identification
- Positive labels
- Existing Ground Surface, OGL, Original Ground Level, NGL
- Negative labels
- —
- Visual features
- irregular ground line under the formation
- Min identity clues
- 2
Evidence
- Preferred views
- cross_section, longitudinal_section
- Evidence types
- view, detail, schedule, note, dimension, level, section_callout
- Source trace required
- yes
Measurements (1)
| Name | Symbol | Unit | Required |
|---|---|---|---|
| Existing Ground Level | OGL | m | required |
Relationships (1)
- bounded_by
highway.asset
BOQ items (0)
None — no quantity is derived from this class directly.
Validation
- Blocking if missing
- no
- Human review allowed
- yes
no_evidence_no_numberretain_document_page_bbox_and_evidence_iddo_not_mix_drawing_revisionsdo_not_average_conflicting_valuesprefer_explicit_labels_over_shape_onlymatch_plan_profile_and_cross_section_when_applicable
Provenance
- Basis
- taxonomy_spec
- Project values included
- no
- mindmap_module_spec_taxonomy_highway
- no page list
Children (0)
None — this is a leaf class and can be deleted.