Open Infra — GIS and NLCS base data for Open CAD Studio

Plugin for Open CAD Studio for infrastructure and civil engineering (infra en civiele techniek), in the Netherlands and worldwide.

GIS workbench, modelled on the FreeCAD GIS(2BIM) workbench. Set the project location and coordinate system, then pull aerial photos, WMS/WFS layers and OpenStreetMap straight into the DWG.
Dutch base data conform NLCS, like InfraCAD Map: BGT, cadastral map and KLIC deliveries on NLCS layers, with object data and a finished drawing sheet.
AHN heights: spot heights, contour lines and length profiles from AHN4, and the AHN5 point cloud attached in 3D.

_{Example drawing: BGT, cadastre and a KLIC delivery around the Grote Kerk in Dordrecht. A1 at 1:500, made with five commands. Available as DWG, PDF and PNG.}

At a glance


NLCS 5.02 built in	3,659 objects in 32 main groups, 10 disciplines, 4 drawing statuses, 256 colours
NLCS linetypes	543 (107 plain dash patterns, 436 with symbols or text)
BGT → NLCS	719 rules from the official NLCS-BGT 5.0 mapping
BGT	42 PDOK collections in 11 groups, current objects only
KLIC	13 IMKL 2.0 themes: electricity (LS/MS/HS), data, gas (LD/HD), water, district heating, sewer, chemicals
Server presets	19: 10 WMS, 8 WFS and 1 XYZ, covering the Netherlands (12), Flanders (2) and worldwide (5), plus your own servers
One-click imports	11 PDOK datasets, 11 OpenStreetMap themes, 11 quick buttons
AHN	AHN4 DTM/DSM at 0.5 m (PDOK WCS); AHN4/AHN5 point clouds (COPC), only the octree nodes of the project area are downloaded
Coordinate systems	14 built in, automatic UTM worldwide, any EPSG code via epsg.io
Map backgrounds	5: OpenStreetMap, PDOK BRT (standard and grey), PDOK aerial photo, Sentinel-2
Commands	33 `GIS_*` commands for the ribbon, scripts and automation
Code	about 6,900 lines of Rust, 17 unit tests; Linux, Windows and macOS builds

In Open CAD Studio

The ribbon tab "Open Infra — GIS":

Group	Button	What it does
Webservices	Geo-locatie	Set the project location. Click it on the map, or search an address, place, parcel or `lat, lon` (PDOK Locatieserver and Nominatim). Choose the coordinate system, draw or type the bounding box, and choose absolute or relative coordinates. Optionally place a base-point marker and import an aerial photo. The location is stored in the drawing (NOD XRecord `OPENINFRA/SITE`).
	WMS / TMS	Choose a server and browse its layers. Test shows a preview on the map; OK en importeren places IMAGE underlays behind the drawing.
	WFS	Choose a server and feature type. Test draws the objects on the map. Then set the label attribute, colour and clipping.
	OpenStreetMap	Worldwide themes: buildings, roads, rail, water, civil structures, land use, cables and pipelines, fences, house numbers.
	PDOK (NL)	Several Dutch base registers in one go: aerial photo, cadastral map, AHN, BAG, parcels, NWB road sections and hectometre markers, ProRail tracks and kilometre markers, waterways.
Snel importeren	Kaartbeeld ▾ / Vectordata ▾	One click, no window, using the saved location.
Basisdata NL (NLCS)	BGT · BRK · KLIC	The NLCS page of the workbench (see below).
	BGT · Kadaster	One click: the current BGT, or cadastral boundaries and parcel numbers, on NLCS layers.
	KLIC	Open a KLIC delivery: the Kadaster zip or `GI_gebiedsinformatielevering_*.xml`. It is shown on the map, then drawn.
	Tekenblad	NLCS drawing sheet around the import area: frame, title block, legend of the layers used, north arrow, scale bar and RD coordinate crosses.
Hoogte (AHN)	AHN	The AHN page of the workbench: options, and Test to show contour lines on the map.
	Hoogtepunten · Hoogtelijnen	Spot heights in a grid, and contour lines (minor/major, labelled) from AHN4, at their true elevation.
	Profiel	Length profile along a selected polyline or picked points: ground (DTM) and optionally surface (DSM), height grid, profile band with distances and heights, and section line A–A' in plan.
	Puntenwolk	The AHN5 (or AHN4) point cloud of the import area, coloured by class, height or RGB. It is written as `.rcs` next to the drawing and attached; it shows in a 3D visual style.
Hulpmiddelen	Gebied · Punt info · Coördinaten · Servers	Pick the import area in the drawing, read a point's coordinates, convert coordinates, and manage presets and your own WMS/WFS/XYZ servers.

The workbench window

Every page follows the FreeCAD GIS dialogs:

A map at the top shows the project location and the bounding box.
Grouped settings follow.
A fixed action bar holds OK en importeren, Test and Annuleren.

You choose the map background in a Leaflet-style layer switcher at the top right. Click the map to set the location; Shift+drag draws the bounding box.

Geographic location	WMS preview (PDOK aerial photo, 8 cm)

Server presets, Netherlands, Flanders and worldwide	BGT · Kadaster · KLIC with the BGT preview in NLCS colours

AHN-hoogtes with the contour preview (coloured by height)	AHN5 point cloud in Open CAD Studio (3D, by class)

Dutch base data conform NLCS

The NLCS tables and the official NLCS-BGT 5.0 mapping are built in from assets/nlcs: objects, colours, linetypes, statuses, disciplines and main groups. The source is DigiGO / Stichting NLCS, under CC BY 4.0. tools/nlcs_tables.py regenerates them from a new NLCS publication.

Layers: every object goes on its NLCS layer STATUS-DISCIPLINE-HOOFDGROEP-OBJECT-ELEMENT, e.g. B-XX-VH-GESLOTENVERHARDING_ASFALT-G or B-OI-KL-GAS_LD-G.
- The layer gets the NLCS colour, lineweight and linetype for the chosen drawing status (B/N/T/V).
- Linetypes are defined in paper millimetres, and entities get the linetype scale of the plot scale.
- Elements: G for lines and areas, S for points, T for texts.
BGT: current objects from the PDOK OGC API (eind_registratie IS NULL). Each object is mapped to the most specific NLCS-BGT rule, using function, physical appearance and plus attributes. Street names and house numbers are placed at their BGT rotation.
Cadastral map (BRK): parcel boundaries on KG-GRENS_PERCEEL, and parcel numbers at their BRK rotation.
KLIC:
- IMKL 2.0 deliveries are read with OpenAEC's klic2geo.
- Each theme goes on its KL or RI object.
- Cables and pipes get labels such as G-LD Stedin 160 mm PVC, with duplicates on parallel cables left out.
- IMKL theme colours can be used instead of the NLCS colours.
Object data: each entity carries its source attributes as XDATA OPENINFRA, for example BGT lokaal_id, function and material, or the KLIC operator, diameter and material.
Drawing sheet:
- The sheet format is chosen automatically (A3–A0 landscape).
- The title block lists the data sources of the imports.
- The legend shows the NLCS layers used, grouped by main group.
- Sheet texts follow the NLCS text classes (T1.8, T2.5, …).

AHN heights, profiles and point clouds

Heights: AHN4 from the PDOK WCS: DTM (ground level) and DSM (surface), 0.5 m float grids in m NAP. Larger areas are fetched in tiles or at a coarser cell size.
Spot heights go on OG-HOOGTEPUNT, with labels such as +2,43. Contour lines go on OG-HOOGTELIJN_MINOR/MAJOR (marching squares on a lightly smoothed grid). Both sit at their real height (Z).
Length profile (GIS_PROFIEL):
- Select a polyline or line, or pick points and press Enter. Then pick the lower-left corner of the profile.
- The profile draws the ground line on GW-MAAIVELD, optionally the surface line, and a height grid with NAP labels.
- The profile band (AL-PROFIELBALK) lists distances and heights. The NAP line is drawn when it is in range, and the section line A–A' in plan.
- The profile breaks where AHN has no ground level (buildings, water).
Point cloud (GIS_PUNTENWOLK):
- AHN5 or AHN4 is read as COPC (Cloud Optimized Point Cloud) from Het Waterschapshuis' 1 km tiles. Only the octree nodes in the import area are downloaded, at the chosen point spacing.
- The cloud is coloured by class (ground, buildings, water, structures, other), by height or by RGB.
- It is saved as .rcs next to the drawing and attached with POINTCLOUDATTACH.
- Example: 300 × 250 m at 0.25 m spacing is about 1.4 million points and a 29 MB file.
Punt info also reports the AHN ground and surface height of the picked point.

Length profile across the Grotekerksplein: the ground line breaks at the harbour water and the buildings.

Example drawing

examples/dordrecht-nlcs is the existing situation around the Grote Kerk in Dordrecht. It is 300 × 250 m in RD, on an A1 sheet at 1:500.


Entities	3,439: 1,242 BGT, 1,328 cadastre, 632 KLIC, 237 drawing sheet
NLCS layers	68, with 8 NLCS linetypes
With object data (XDATA)	3,202
Files	DWG (0.7 MB), PDF A1 (1 MB), PNG

KLIC delivery around the church, labelled per operator	Legend and title block

It was made in an empty metric drawing with:

GIS_SITE RD 104885 425320 300 250 Dordrecht, Grote Kerk
GIS_Q_BGT
GIS_Q_BRK
GIS_KLIC_IMPORT <path>/Levering_21O072584_1.zip
GIS_TEKENBLAD Situatie bestaand - BGT, kadaster en kabels en leidingen

Commands

For the command line, scripts and automation:

Purpose	Commands
Workbench pages	`GIS_LOCATIE`, `GIS_KAART`, `GIS_WFS`, `GIS_OSM`, `GIS_PDOK`, `GIS_BGT`, `GIS_COORD`, `GIS_SERVERS`
In the drawing	`GIS_GEBIED` (pick the import area), `GIS_PUNT` (point info)
Location	`GIS_SITE RD <x> <y> [width] [height] [name]`, `GIS_SITE <lon> <lat> [width] [height] [EPSG:code] [name]`
Map images	`GIS_Q_LUCHTFOTO`, `GIS_Q_KADASTER`, `GIS_Q_AHN`, `GIS_Q_OSMKAART`, `GIS_Q_SATELLIET`
Vector data	`GIS_Q_BAG`, `GIS_Q_PERCELEN`, `GIS_Q_NWB`, `GIS_Q_HECTO`, `GIS_Q_SPOOR`, `GIS_Q_OSM`
NLCS base data	`GIS_Q_BGT`, `GIS_Q_BRK`, `GIS_KLIC [file]` (opens the page), `GIS_KLIC_IMPORT <file>`, `GIS_TEKENBLAD [subject]`
AHN	`GIS_AHN` (page), `GIS_HOOGTEPUNTEN`, `GIS_HOOGTELIJNEN`, `GIS_PROFIEL`, `GIS_PUNTENWOLK`
Help	`GIS_HELP`

Coordinate systems and units

Built in:
- RD New (EPSG:28992)
- ETRS89 / UTM 31–33N
- Belgian Lambert 72 and 2008
- British National Grid
- CH1903+ / LV95
- Lambert-93
- WGS 84 and Web Mercator
Automatic UTM anywhere in the world.
Any other EPSG code is fetched once from epsg.io and stored with the drawing.
The address search proposes the national grid for the country it finds.
RD accuracy: RD uses the 7-parameter transformation, about 0.2 m from RDNAPTRANS. That is fine for underlays and context. For survey work, use data that is already in RD; PDOK, BGT, BRK and KLIC all supply it that way.
Units: INSUNITS sets the drawing units: metres (default for civil drawings), mm or cm.
- Absolute: CRS coordinates go straight into the drawing, as is usual in Dutch infra work.
- Relative: the base point becomes 0,0.
Map images are saved next to the drawing in <name>_GIS/.

Architecture

src/gis/          host-free engine: crs (proj4rs), site, servers, caps (WMS/WFS GetCapabilities),
                  geocode, raster (GetMap/XYZ + reprojection), wfs, osm (Overpass), vector (GeoJSON + clipping),
                  ogcapi (OGC API Features), bgt (PDOK BGT), klic (IMKL via klic2geo),
                  ahn (WCS height grids, contours, profiles), pointcloud (COPC over HTTP, .rcs writer)
src/nlcs.rs       NLCS 5.02 tables, layer names and styles, BGT/KLIC → NLCS mapping
src/basisdata.rs  BGT, cadastre and KLIC drawn conform NLCS, with object data
src/tekenblad.rs  NLCS drawing sheet: frame, title block, legend, north arrow, scale bar
src/hoogte.rs     AHN spot heights, contour lines, length profiles and point clouds in the drawing
src/emit.rs       engine output → DWG entities (LWPOLYLINE, TEXT, CIRCLE, IMAGE)
src/bridge.rs     host requests from worker/window threads, NLCS layers and linetypes, site in the DWG
src/import.rs     import flows shared by the window and the ribbon quick buttons
src/ui/           workbench window (egui), runs in the plugin process beside the CAD window
src/lib.rs        manifest, ribbon, commands (GIS_*), click interaction (Gebied, Punt info)

Open CAD Studio runs plugins out-of-process and has no dialog API for plugins, so the plugin opens its own window. Network work runs on worker threads, so the CAD window stays responsive and the plugin call timeout is never reached.

Installing

Use Open CAD Studio's Plugin Manager (PLUGINS): choose Add a repository, enter OpenAEC-Foundation/Open-Infra and install the latest release.

Or install by hand:

Download openaec.open-infra-<platform> and plugin.toml from the release.
Put them in <config>/OpenCADStudio/plugins/openaec.open-infra/.
Restart Open CAD Studio.

Release numbers follow Open CAD Studio's calendar numbering. Release 2026.44 is built for Open CAD Studio v2026.42 (plugin API 10, opencadcodec 5d4f11a, rustc 1.99.1). The host only loads a plugin built against its own opencadcodec revision and rustc.

Building

./scripts/install.sh      # cargo build --release + install into ~/.config/OpenCADStudio/plugins/openaec.open-infra
cargo test --lib          # engine tests (CRS, clipping, tiling, parsing, NLCS tables)

Cargo.toml pins ocs_plugin_api to the Open CAD Studio v2026.42 release. For a newer Open CAD Studio, move the rev to the commit of that release, and update the rustc version in .github/workflows/release.yml to match.

For development against a local Open CAD Studio checkout, add a .cargo/config.toml (not committed):

[patch."https://github.com/HakanSeven12/OpenCADStudio"]
ocs_plugin_api = { path = "../OpenCADStudio/crates/ocs_plugin_api" }

Platforms

Linux (X11/Wayland) and Windows: everything works.
macOS: the ribbon quick buttons and commands work. The workbench window does not yet, because winit needs the main thread there.

Data sources and licences

PDOK, Kadaster, Rijkswaterstaat and ProRail: open data (BGT CC0, BRK CC BY 4.0). Credit the source; the title block does this for the imports.
AHN (Actueel Hoogtebestand Nederland): open data (CC0). Height grids come via the PDOK WCS, point clouds from Het Waterschapshuis' object storage.
NLCS tables and the NLCS-BGT mapping: DigiGO / Stichting NLCS, CC BY 4.0 (see assets/nlcs/NOTICE.md).
OpenStreetMap: © OpenStreetMap contributors (ODbL), via Overpass, Nominatim and the OSM tile server. Follow their usage policies (light, interactive use).
Sentinel-2 cloudless by EOX: CC BY-NC-SA 4.0 (non-commercial).

Licence: GPL-3.0-only (LICENSE), the same as the Open CAD Studio plugin API.

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Open Infra — GIS and NLCS base data for Open CAD Studio

At a glance

In Open CAD Studio

The workbench window

Dutch base data conform NLCS

AHN heights, profiles and point clouds

Example drawing

Commands

Coordinate systems and units

Architecture

Installing

Building

Platforms

Data sources and licences

About

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Name		Name	Last commit message	Last commit date
.github/workflows		.github/workflows
assets		assets
docs/images		docs/images
examples/dordrecht-nlcs		examples/dordrecht-nlcs
scripts		scripts
src		src
tools		tools
.gitignore		.gitignore
Cargo.lock		Cargo.lock
Cargo.toml		Cargo.toml
LICENSE		LICENSE
README.md		README.md
RELEASE_NOTES.md		RELEASE_NOTES.md
plugin.toml		plugin.toml

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Open Infra — GIS and NLCS base data for Open CAD Studio

At a glance

In Open CAD Studio

The workbench window

Dutch base data conform NLCS

AHN heights, profiles and point clouds

Example drawing

Commands

Coordinate systems and units

Architecture

Installing

Building

Platforms

Data sources and licences

About

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