DXF-PCI Inspector

🇫🇷 Version française : LISEZMOI.md

▶️ Launch the inspector — sheets are read on your computer, nothing is uploaded.

Viewer and working tool for the sheets of the French computerised cadastral map (PCI, Plan Cadastral Informatisé) in DXF format, published by the DGFiP (French tax administration) on cadastre.data.gouv.fr.

Single file cadastre_dxf_inspecteur_v21.html: no installation, no library, no server. It opens in a browser and works offline. DXF files are read locally, nothing is sent anywhere.

User interface in French (the DXF-PCI standard and its layer names are French).

Eric PERRET — French Guiana — personal project, developed on personal time, drawing on professional experience in land management, usable by any office that needs to quickly locate a parcel, a street or a street number.

Cayenne, sheets 302000AE01 and 302000AH01 displayed together (Ctrl+click), parcels coloured by built occupation, locked record of a permanent building and its parcel, municipality mini-map.

Sample sheet 302000AB01.DXF provided in the repository.

Getting started

1. Download a département .zip from
   https://cadastre.data.gouv.fr/data/dgfip-pci-vecteur/<release>/dxf/departements/
2. Unzip it.
3. Open the link above, or the downloaded cadastre_dxf_inspecteur_v21.html, in a recent browser (Firefox, Chrome, Edge).
4. Ouvrir un dossier… (open a folder) and select the root directory of the sheets (dep973/, 97302/…).
   The first sheet of the first municipality is displayed at once.

A single sheet (.DXF or .tar.bz2 archive) can also be opened with Ouvrir un DXF… (open a DXF) or by drag and drop. To try it right away: 302000AB01.DXF, provided in the repository.

Features

Reading a sheet

• Parcels, permanent, light and aerial-view buildings, holes, sections and subdivisions, texts at their position and scale.
• Parcel colouring: built occupation (unbuilt / light / permanent) or neighbourhood (two neighbours never share a colour), nested parcels handled.
• XDATA labels: IDU (parcel identifier), SUPF area, section IDU.
• Full record on hover: XDATA, computed area and perimeter, neighbours, buildings per parcel, parcels touched by a building with their share in %.
• Search by IDU or parcel number.

Département delivery

• Reading a delivery folder: .tar.bz2 archives decompressed in the browser, list of sheets per municipality (34,969 French municipalities built in).
• Overview map of the département, municipality mini-map, outlines of neighbouring sheets.
• Inventory of the sheet and of the delivery, checked against the DXF-PCI standard (non-standard layers, non-compliant primitives, missing layers), TSV copy.

Streets and localities

• Automatic index of the displayed municipality: street names (3ZONCOMMTEX), street axes (1ZONCOMM), localities (3LIEUDITTEX, 1LIEUDIT), street numbers (3NUMVOIE).
• Names sorted as « Lilas (rue des) », duplicates merged.
• Click on a street: start-to-end framing and list of its numbers. Click on a number: view centred on the number.

Measurement and output

• Snapping area and polyline tools (vertices and blocks of visible layers, 25 cm grid), areas in ha a ca, lengths, bearing in degrees and grads.
• Assisted division: lot of a given area, line parallel to a side or pivoting on a vertex.
• Exports: surveyor DA (_danum.txt and _lever.txt in a .zip), PNG of the view at scale 1/N, GeoJSON for QGIS.
• Clickable standard scale (1/100 to 1/1,000,000), Google photo or map background registered in the sheet's projection.

Controls

Gesture	Action
Wheel	Zoom
Drag	Pan the view
Click on an object	Lock the record (the wheel then scrolls the record); click again: release
Double-click on a neighbouring sheet	Open that sheet (view kept)
Ctrl+click on a neighbouring sheet	Add it to or remove it from the display
← →	Previous / next sheet of the municipality
↑ ↓	Previous / next municipality
F	Fit the view
M	Show / hide the mini-map
+ / −	Zoom
Esc	Release the selection, close the inventory, leave a tool
Measure: click / right-click / Del / Alt	Add a vertex / finish / delete the vertex / no snapping

Supported projections

Coordinates are displayed as delivered. The label and the background registration are deduced from the coordinates:

• RGFG95 / UTM 22N (EPSG 2972) in French Guiana;
• RGF93 / Lambert-93 (EPSG 2154) in mainland France and Corsica.

Measurements are planar in the projection ("fiscal" area, comparable to SUPF).

Data and privacy

• Sheets stay on the computer: reading, decompression and computation happen in the browser.
• Only the Google background (off by default) calls an external service; its use is subject to Google's terms.
• Display preferences (collapsed sections) are stored in the browser's localStorage.

Known limitations

• Building → parcel and number → street links are computed geometrically: shares in % and links are approximate.
• The same street name found in two distant places of the municipality is grouped into a single entry.
• A recent browser is required (JavaScript, 2D canvas, TextDecoder).

Author

Eric PERRET — eperret@azs.fr — www.azs.fr

v21.1 (18/10/2026): AZS visual identity (slate / amber / cyan palette, AZS mark linking back to www.azs.fr); cartographic colours unchanged. v21.2 (18/10/2026): footer contact changed to eperret@azs.fr (personal development).