Maps
Isochrone / travel-time map
Shows areas reachable from origins within specified travel times or costs.
- Map
- Geography
- Accessibility
What it answers
What can be reached within a travel-time threshold?
- Shape
- Reachability polygons
- What it shows
- Reachable areas and accessibility gaps.
Example
The question
How far can customers travel to our store in 15, 30 and 45 minutes?
Travel time by car from the Lund store (isochrone map)
Illustrative data. It belongs to no company.
When to use it
Use it when
Accessibility and service-area analysis.
Avoid it when
Straight-line circles presented as network travel-time results.
How to read it
Read origin, mode and time-labelled reachability boundaries.
Note
Requires a travel model or precomputed polygons.
The data you need
- Layout
- Geospatial polygon records
- Fields
- OriginID: text; TravelTime: number; Polygon: geometry
- One row is
- One precomputed reachable area for an origin and travel-time threshold. What is the grain?
- Rules
- Supply actual polygon geometry, not only these reference labels. State transport mode, network, time units and departure assumptions.
- Optional
- Alternative computation inputs: origin coordinates plus routing network/service and thresholds.
- Preparation
- Compute network/service travel-time reachability or obtain polygons for a specified mode, departure time and thresholds.
- Units
- Travel-time thresholds use minutes/hours or stated cost. Origin, mode anddeparture assumptions define reachability.
Worked example
Routing model supplies 15-minute and 30-minute polygons from A. The latter shows a larger reachable set under the same mode and assumptions.
| OriginID | TravelTime | GeometryRef |
|---|---|---|
| A | 15 | polygon_15min |
| A | 30 | polygon_30min |