About and licences
Petra Planner · © 2026 Petra. All rights reserved.
The scheduling engine, screens and server software are this product's own code. The open data below is used in accordance with its licences.
Software components
No third-party software libraries are used. All components, including the 3D viewer, spreadsheet (XLSX) import and export and the PDF reader, are this product's own code.
Fonts
No font files are distributed; screens use the fonts installed on your device.
Data sources
| Resources | Use | Attribution | Licence |
|---|---|---|---|
| OpenStreetMap | Building, road and land-use data in the environment model | © OpenStreetMap contributors | ODbL 1.0 |
| SRTM | Terrain elevations in the environment model | NASA / USGS | Public domain |