Update docs

LICENSE

@@ -1,6 +1,6 @@
 BSD 3-Clause License
 
-Copyright (c) 2025, Yuta Sato & City2Graph developers
+Copyright (c) 2025-2026, Yuta Sato & City2Graph developers
 
 Redistribution and use in source and binary forms, with or without
 modification, are permitted provided that the following conditions are met:

docs/api/index.md

@@ -1,3 +1,8 @@
+---
+description: City2Graph API documentation: Modules for Urban Morphology, Public Transportation Networks, Mobility Flow Graphs, and Heterogeneous Metapath construction for geospatial machine learning.
+keywords: City2Graph API, PyTorch Geometric, Heterogeneous Graphs, Urban Morphology, Public Transport, GTFS, OD Matrices, Mobility Networks, POI Analysis, Overture Maps, Geospatial Deep Learning, GeoAI, Graph Neural Networks (GNNs)
+---
+
 # API Reference
 
 This section contains the complete API reference for the `city2graph` package.

docs/examples/index.md

@@ -1,20 +1,26 @@
+---
+description: Python tutorials for urban network analysis: Heterogeneous GNNs, OpenStreetMap (OSM) integration, GTFS to Graph conversion, and Origin-Destination (OD) matrix processing for spatial AI.
+keywords: City2Graph Examples, Graph Neural Networks, Metapath, Urban Morphology, GTFS, OD Matrix, Spatial Proximity, Urban Analysis, Python Tutorial
+---
+
 # Examples
 
 This section provides examples of how to use City2Graph in various urban analysis scenarios.
 
 | Example | Description |
 | :--- | :--- |
-| [Constructing Metapaths](add_metapaths.ipynb) | Demonstrates the workflow of metapath construction from a heterogeneous graph. The example creates a dual graph of streets, connect amenities, and materialize metapaths between amenities via streets. |
-| [Generating Graphs by Proximity](generating_graphs_by_proximity.ipynb) | Illustrates how to generate and visualize different spatial graph types based on proximity metrics (KNN, Delaunay, Gilbert, Waxman), and demonstrates how to bridge and group nodes for constructing heterogeneous graphs. |
-| [Generating Graphs from OD Matrix](generating_graphs_from_od_matrix.ipynb) | Demonstrates the conversion of Origin Destination (OD) Matrix into graph, supporting both edgelist and adjacency formats. |
-| [Transportation Graphs from GTFS](gtfs.ipynb) | Transforms complex transit schedules (GTFS) into intuitive graph representations for urban accessibility analysis and network visualization. |
-| [Morphological Graph from OvertureMaps and OpenStreetMap](morphological_graph_from_overturemaps.ipynb) | Create morphological graphs from Overture Maps and OpenStreetMap, capturing relationships between public (streets) and private (tessellations) spaces. |
+| [Metapath Construction for Heterogeneous GNNs](add_metapaths.ipynb) | Demonstrates the workflow of metapath construction from a heterogeneous graph. The example creates a dual graph of streets, connects amenities, and materializes metapaths between amenities via streets for **Heterogeneous Graph Neural Networks (HGNNs)**. |
+| [Morphological Graphs from Overture Maps & OpenStreetMap](morphological_graph_from_overturemaps.ipynb) | Create morphological graphs from **Overture Maps** and **OpenStreetMap (OSM)**, capturing relationships between public (streets) and private (tessellations/buildings) spaces for urban form analysis. |
+| [GTFS to Public Transit Networks as Graphs](gtfs.ipynb) | Transforms **General Transit Feed Specification (GTFS)** schedules into intuitive graph representations for **public transport accessibility analysis** and multi-modal network visualization. |
+| [OD Matrices to Mobility Networks as Graphs](generating_graphs_from_od_matrix.ipynb) | Demonstrates the conversion of **Origin-Destination (OD) Matrices** into mobility networks, supporting both edge-list and adjacency formats for modeling **human mobility flows**. |
+| [Spatial Proximity Graphs](generating_graphs_by_proximity.ipynb) | Illustrates how to generate and visualize different spatial graph types based on proximity metrics (**KNN, Delaunay Triangulation, Gilbert, Waxman**), bridging and grouping nodes for **spatial connectivity**. |
 
 ## External Links
 
 | Title | Author | Language | Type | Release |
 | :--- | :--- | :--- | :--- | :--- |
 | [City2Graph: Python package for spatial network analysis and GeoAI with GNNs](https://medium.com/@yuta.sato.now/city2graph-a-python-package-for-spatial-network-analysis-and-graph-neural-networks-gnns-bc943dd6d85e) | Yuta Sato | EN | Tutorial | Sep 23, 2025 |
 | [I created a Python library that converts geospatial data into graph representations for heterogeneous GNNs](https://zenn.dev/yutasato/articles/9d7994dc53d378) | Yuta Sato | JA | Tutorial | Oct 14, 2025 |
+| [Verifying Hiroshima Station Redevelopment with Network Science using city2graph](https://nttdocomo-developers.jp/entry/2025/12/22/090000_6) | Koki Eguchi | JA | Blog | Dec 22, 2025 |
 
 *Note*: We welcome external examples! Please submit [a pull request](https://github.com/c2g-dev/city2graph/pulls) if you have an example to share.

mkdocs.yml

@@ -1,10 +1,13 @@
 site_name: City2Graph
 site_url: https://city2graph.net/latest/
 site_author: Yuta Sato
-site_description: Transform urban data into graphs for spatial analysis and Graph Neural Networks
+site_description: >-
+  City2Graph is a Python library to transform geospatial data (OSM, GTFS, POIs)
+  into heterogeneous graphs for Urban Network Analysis and Graph Neural Networks
+  (GNNs).
 repo_url: https://github.com/c2g-dev/city2graph
 repo_name: c2g-dev/city2graph
-copyright: Copyright © 2025 Yuta Sato & City2Graph developers
+copyright: Copyright © 2026 Yuta Sato & City2Graph developers
 use_directory_urls: false
 
 theme:
@@ -61,6 +64,7 @@ extra_javascript:
 # Plugins
 plugins:
   - search
+  - mike
   - social
   - git-revision-date-localized:
       enable_creation_date: true
@@ -187,12 +191,12 @@ nav:
   - Home: index.md
   - Installation: installation.md
   - Examples:
-      - Introduction: examples/index.md
-      - Metapath: examples/add_metapaths.ipynb
-      - Morphology: examples/morphological_graph_from_overturemaps.ipynb
-      - GTFS: examples/gtfs.ipynb
-      - OD Matrix: examples/generating_graphs_from_od_matrix.ipynb
-      - Proximity Graphs: examples/generating_graphs_by_proximity.ipynb
+      - Overview of City2Graph Examples: examples/index.md
+      - Metapath Construction for Heterogeneous GNNs: examples/add_metapaths.ipynb
+      - Morphological Graphs from Overture Maps & OpenStreetMap: examples/morphological_graph_from_overturemaps.ipynb  # yamllint disable-line rule:line-length
+      - GTFS to Graphs: examples/gtfs.ipynb
+      - OD Matrix to Graphs: examples/generating_graphs_from_od_matrix.ipynb
+      - Spatial Proximity Graphs: examples/generating_graphs_by_proximity.ipynb
   - API Reference:
       - Overview: api/index.md
       - Graph: api/graph.md