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Preview
Use the tabs to switch views. Compare and basemap controls work best in Overlay and Modern map.
Extracted labels
Extracted parcels
| ID | Historic feature | Pixel X | Pixel Y | Modern X | Modern Y | Confidence | Residual m | Action |
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About
What this app does
This tool is for historical land plans, sketch plans, survey sheets, Māori land plans, and similar scanned maps. It accepts TIFF, JPG, PNG, and PDF. The app runs in the browser, extracts visible map content, suggests draft georeferencing, and packages the outputs for download.
It is designed for fast first-pass GIS preparation. It is useful when you want to turn an old scanned plan into a workable draft that can be reviewed in QGIS, ArcGIS, or another GIS package.
How it works
- Upload one image or PDF.
- The app cleans the scan, flattens the paper background, isolates the main map area, and improves text and line visibility.
- It extracts boundaries, streams, parcels, map labels, and likely anchor features. It now pushes number-heavy survey angles and measurements out of the main text outputs so the label results are cleaner.
- It lets you review labels and parcels, and add control points by clicking the historic image and then the modern map.
- It builds a draft NZTM2000 georeferencing fit when enough control points exist.
- It exports a GIS-ready image package and supporting vector, CSV, and JSON files.
What it is good for
- Historic East Coast, Māori land, and nineteenth century survey plans
- First-pass extraction before manual GIS cleanup
- Comparing old boundaries and named places with modern data
- Creating draft control point tables and review bundles
- Preparing material for QGIS or ArcGIS georeferencing review
GIS export
When at least three good control points are supplied, the app exports a GIS-ready georeferenced image package in NZTM2000. This includes a raster image, a world file, and a PRJ file that can be loaded in common GIS software. It also exports georeferenced vector layers where possible. The app also exports a merged GeoJSON bundle and a control point residual report.
The image export is intended as a practical draft, not a cadastral or survey-grade result. Always review fit quality and alignment before operational use.