City Data Explorer — Weimar

A browser-based digital twin of Weimar (Thuringia, Germany), built entirely from open geodata. Layers can be inspected on interactive 2D/3D maps and exported for a selected area as GeoJSON or Rhino 3DM for further analysis in Rhino / Grasshopper.

Open it: https://bauhaus-infau.github.io/weimar-city-data-explorer/

Maps

• Urban Morphology — buildings, parcels, mobility, districts
• Simplified Model for Analysis — precise geometry for Rhino / Grasshopper, incl. the Space Syntax road networks and counting gates
• Detailled Buildings (LOD2) — buildings with roofs (WEGA LoD2)
• Natural Elements — water, geology, terrain, protected areas

Each map has a layer list on the left (eye icon toggles visibility), a 2D/3D switch and tools on the right: export (area selection → GeoJSON zip or 3DM), scale grid, PNG/PDF image export, legend.

Run locally

The page must be served over HTTP (not opened as file://):

python -m http.server 8000

then open http://localhost:8000/.

Repository layout

index.html, app.js, detailed.js, style.css   the web application (no build step)
layers/layers.json                           layer manifest: sources, layers, sidebar, palettes
layers/base_border*.json                     standard export areas
layers/data/                                 prepared vector data (GeoJSON, LoD2 binary)
terrain/weimar-dgm/                          terrain tiles (Terrarium PNG) built from DGM1
materials/                                   counting sheets for the Space Syntax survey
tools/                                       Python scripts that downloaded and prepared the data

tools/ documents how the data in layers/data/ and terrain/ was produced. The scripts expect the original working folders (data/raw, data/processed), which are not part of this repository, so they are a reference rather than a one-click rebuild.

Data sources and licences

• Geoportal Thüringen / GDI-Th (ALKIS, ATKIS, DGM1, LoD2 CityGML, WMS services) — © GDI-Th, Datenlizenz Deutschland – Namensnennung 2.0
• OpenStreetMap — © OpenStreetMap contributors, ODbL
• Basemap — © CARTO, © OpenStreetMap contributors

The attribution for each individual layer is stored in layers/layers.json and shown in the application.