Atlasly synthetic DXF sample — 30 September 2026

Invented geometry only. Not site, survey, flood or planning evidence.
Generated offline with the repository's generateDXF function.
Reproduce: node_modules/.bin/tsx scripts/generate-synthetic-context-sample.ts

Units: local metres; X east, Y north. Origin longitude 0, latitude 51.
Origin is a synthetic reference, not a project location.
NOT British National Grid / EPSG:27700. Do not assign a national grid
and assume the geometry has been transformed or aligned to a survey.

A-ROAD-PRIMARY: (-50,-30) to (50,-30), length 100 metres.
A-BLDG: rectangle 40 by 20 metres; illustrative thickness 6 metres.
A-TREE: point at (30,10).
C-TOPO-MAJOR: three vertices, source elevation 25 metres.
No separate contour-label layer is included in this sample.
A-CONST-FLOOD: invented outline; no real flood information.
A-DATA-SOURCE-INFO: synthetic provenance metadata.
A-ANNO-*: grid, scale bar, north arrow and title.

Check metres, measure the road line and inspect named layers and contour
height in your own CAD version. The sample has been structurally and
numerically checked offline; no AutoCAD compatibility test is claimed.
Retain source notes, coordinate information and unresolved issues when
handing over real context. It is not a substitute for a measured survey.