Reachability Service
The most powerful part of the Reachability service is that we can get actual measures - not classified distance groups. So we know exactly how far away each point is. By having this precision, we can filter points by travel time, as well sort points presented in a non-geographic manner. This can be used for filtering by distance as well. The reachability service is optimized for bulk points, so it’s clearly the best way to measure lots of points at once.

Key Features

  • Get precise travel time to all of your source points
  • Measure from multiple sources

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:

  1. 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
  2. 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
  3. 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
  4. Point-In-Polygon tests won’t give you precise travel times for your targets - only “in” or “out”

To sum this up: Our polygons are great for visualizing travel times. For analyzing them, use our reachability service.