Convert CSV to 12DA
Turn CSV (with coordinates) data into 12d Model archive — free, instant, and entirely in your browser, with optional reprojection to any of 200+ coordinate systems.
No upload. No account. Your data stays on your machine.
About CSV (with coordinates) (CSV)
Plain-table points: columns for X/Y (or easting/northing, lon/lat) become geometry.
Worth knowing: Point data only on read (X/Y columns); geometry of other types is written as WKT.
About 12d Model archive (12DA)
12d Model's ASCII archive — the native exchange format of 12d, widely used in civil design and construction surveying. Reproj reads super strings, points and TIN surfaces, and writes attributed super strings that 12d can inquire — so GIS attributes survive the trip into 12d.
Worth knowing: Like CAD files, a .12da carries no coordinate system — tell us the grid when reading, and pick a projected grid (e.g. your MGA zone) when writing. Alignments are not converted yet. Very large TINs (over 300,000 triangles) are skipped in the browser; TINs are written as triangle strings, not as a 12d TIN.
How the conversion works
- Drop your CSV file above.
- We read it locally with GDAL compiled to WebAssembly — nothing is uploaded.
- Optionally pick an output coordinate system; official datum grids are applied automatically.
- Download your 12DA result, with a transformation report showing exactly what was done.