Aperta: Path-first, cross-modal accessibility analysis in Python

Open-source Python library for cross-modal accessibility analysis on transport networks. Path-first routing returns the realized route alongside the travel cost as a single primitive; a tiered origin–destination structure keeps the approach tractable from city to country scale; mode and network are orthogonal, so walking, cycling, and car accessibilities on different networks combine natively. Includes integrated traffic-flow estimation and iterative edge-weight calibration.