Graph Operations
The Graph Operations panel transforms the imported graph: project it to a metric CRS, convert between directed/undirected and GeoDataFrame representations, simplify and consolidate it, and truncate it to an area.
Note
Requires an active OSMnx graph. Until one is imported the panel shows a hint pointing to Download.
Projection
| Control | Description |
|---|---|
| Project to CRS | Project the WGS84 graph to an appropriate metric CRS. The current CRS is shown once projected. |
Tip
Project before computing lengths, speeds, statistics, or distances so that metric values are accurate.
Graph Type Conversion
| Control | Description |
|---|---|
| To Undirected | Convert to an undirected graph. |
| To DiGraph | Convert to a simple directed graph. |
GeoDataFrame Conversion
| Control | Description |
|---|---|
| Graph to GeoDataFrames | Export nodes/edges as GeoDataFrames. |
| GeoDataFrames to Graph | Rebuild the graph from GeoDataFrames. |
Simplification
| Control | Description |
|---|---|
| Simplify Graph | Remove interstitial nodes, keeping topology. |
| Tolerance (m) | Merge distance for Consolidate Intersections. |
| Consolidate Intersections | Merge nearby intersections within the tolerance. |
Truncation
| Control | Description |
|---|---|
| Truncate to BBox | Clip to a bounding box. |
| Truncate to Polygon | Clip to a polygon. |
| Truncate by Distance | Clip to a distance from a center. |
| Keep Largest Component | Discard all but the largest connected component. |
Step-by-step tutorial
For a worked example using Burjassot, follow Clean up the graph.