02CadGis

CAD, KML, GDB and Netcad conversion studio for QGIS

02CadGis is a professional QGIS dock plugin for turning CAD and GIS exchange files into clean GeoPackage layers. It is built for planning, cadastral, municipal, and urban analytics workflows where DXF, KML/KMZ, DGN, FileGDB, and Netcad files need to become usable QGIS data quickly.

Import & Convert CAD/GIS files to GeoPackage or scratch layers.

Netcad NCZ/NCA Batch import drawings, layers, text and tables.

Export Write active QGIS vector layers to DXF, KML or KMZ.

What It Does

• Converts DXF, KML, KMZ, DGN, FileGDB, NCZ and compatible NCA files into .gpkg layers.
• Imports multiple Netcad drawings at once with selectable CAD layers and @TAB attribute tables.
• Expands KML balloon HTML tables and list descriptions into real attribute fields.
• Extracts KML/KMZ GroundOverlay images as georeferenced GeoTIFF layers.
• Simplifies collinear CAD vertices, removes duplicate nodes, and closes small polygon gaps by tolerance.
• Preserves CAD color intent with QGIS renderers and optional buffered labels for text elements.
• Exports active QGIS vector layers to DXF, KML or KMZ.
• Includes a built-in Guide button in the QGIS dock for workflow help.

Supported Workflows

Workflow	Input / Output	Engine	Best for
CAD/GIS import	.dxf, .dgn, .kml, .kmz, .gdb to .gpkg or scratch layers	QGIS GDAL/OGR	Standard exchange files and planning datasets
Future enhancement	.dwg	Planned external/newer CAD reader path	DWG versions beyond GDAL libopencad support
Netcad import	.ncz, compatible .nca	Built-in parser	Netcad drawings with layers, colors, labels and @TAB tables
KML overlay extraction	KML/KMZ GroundOverlay to GeoTIFF	GDAL	Georeferenced image overlays
QGIS export	Active vector layer to .dxf, .kml, .kmz	QGIS vector writer	Delivery back to CAD/GIS exchange formats

QGIS Dock

The plugin opens as one compact dock with three focused panels:

1. CAD & GIS Converter Select source type, source path, target GeoPackage, CRS, cleanup options, KML expansion and GroundOverlay extraction.

2. Netcad NCZ/NCA Importer Select one or more Netcad drawings, review metadata, choose CAD layers and @TAB tables, set closure tolerance, generate geometry metrics, apply colors/labels, and load to QGIS.

3. CAD & GIS Exporter Select a project vector layer and export it as DXF, KML or KMZ.

Use temporary scratch layers for quick inspection. Use GeoPackage output for durable deliverables.

Conversion Flow

flowchart LR
  A[CAD / GIS / Netcad source] --> B{Input type}
  B -->|DXF DGN KML KMZ GDB| C[QGIS OGR reader]
  B -->|DWG| X[Future enhancement]
  B -->|NCZ / NCA| D[Netcad parser]
  C --> E[CRS + cleanup + attributes]
  D --> E
  E --> F{Output mode}
  F -->|GeoPackage| G[(.gpkg)]
  F -->|Scratch| H[QGIS memory layers]
  G --> I[QGIS project]
  H --> I
  I --> J[DXF / KML / KMZ export]

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Netcad Import Notes

The Netcad panel is intentionally detailed because these drawings often contain mixed geometry, text, colors and table data.

• Batch import: select several files; 02CadGis keeps file groups separate by default, or merges matching layer names inside geometry-type groups when Merge geometry types is enabled.
• Metadata review: version, projection text, EPSG hints, feature counts and table counts are shown before conversion.
• Layer filtering: uncheck unnecessary CAD layers or @TAB tables before import.
• Closure tolerance: keeps cadastral polygon creation controlled; use small values unless the drawing has known snap gaps.
• Geometry metrics: optional length, area and centroid fields help QA and reporting.
• Styling: ARGB colors and text labels can be carried into QGIS for easier review.
• Joins: @TAB tables are linked back to geometry where matching name or label fields are available.

If a file does not parse as expected, retry with cleanup disabled and inspect the raw layer selection before increasing tolerance.

Installation

Development path in this plugin workspace:

C:\Users\YE\PyCharmMiscProject\qgis_plugins\zero2cadgis

Optional test environment variable:

$env:QGIS_PLUGINPATH = "C:\Users\YE\PyCharmMiscProject\qgis_plugins"

Restart QGIS, then enable 02CadGis Universal CAD/GIS Importer from Plugins > Manage and Install Plugins.

Build and Validate

python -m unittest zero2cadgis.tests.test_e2e_converter
python packaging\validate_plugin.py zero2cadgis --strict
.\packaging\Build-PluginZip.ps1 -PluginDir zero2cadgis

The release zip is written to:

QGIS_Plugin_Releases\zero2cadgis.zip

Troubleshooting

Symptom	Likely cause	Fix
Plugin does not appear	QGIS is not scanning this folder	Set QGIS_PLUGINPATH and restart QGIS.
DWG does not open	DWG is currently a future enhancement; this QGIS/GDAL build only exposes limited libopencad support	Convert to DXF first, then run 02CadGis.
KML overlay is missing	No valid GroundOverlay or image path	Check the KML/KMZ structure and referenced image files.
Netcad layers are missing	Unsupported entity block or aggressive cleanup	Retry with cleanup disabled and lower closure tolerance.
Hub icon is missing	Metadata icon path mismatch	Keep icon=icons/icon.png and package with the provided build script.

Ownership and License

• Developer: Yusuf Eminoglu
• Email: yusuf.eminoglu@deu.edu.tr
• Repository: https://github.com/YusufEminoglu/zero2cadgis
• License: GNU General Public License v2.0 or later