- Optimized for high volume to measure lots of points at once
- Ideal for sorting and filtering locations, on a map or non-geographic manner
Why not just use polygons?
In typical geographic information systems, reachability tests are often carried out via Point-In-Polygon tests. Several problems occur due to these tests:
- We need to generate the polygons first
- Depending on the complexity of the polygon, especially for transit polygons and high travel times, this can be a time consuming task
- We need to transfer the generated polygon over the wire (unzipped polygons for large travel times can be >2MB in size) and we have to render them
- The Point-In-Polygon test (PIP) needs to be performed
- This is actually a complex task and can take a lot of time in case of a large number of targets and huge polygons
- Point-In-Polygon tests won’t give you precise travel times for your targets - only “in” or “out”
To sum this up: Our isochrones are great for visualizing travel times. For analyzing them, use our Travel Time API.