Isochrones
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A list of specific single range values. For example, if you set the Range to [300, 600, 900], the isochrone service will return areas reachable within 300, 600, and 900 units (either seconds or meters, depending on the range_type parameter) from the given location.
The reachfactor is a measure of the isochrone’s proportion of a circle generated with a mean speed for the specific profile. It’s essentially a comparison of the area of the isochrone to the area of a circle with the same range. Here’s how it’s calculated: First, a circle is generated with a radius equal to the mean speed multiplied by the range of the isochrone. For example, if you have a 10-minute isochrone for a car, and the mean speed for a car is 100 km/h, you would have a radius of 360 * 600 for the circle. The reachfactor is then calculated by dividing the actual area of the 10-minute isochrone by the area of this circle. This gives you a measure of how “efficient” the isochrone is compared to a perfect circle. A reachfactor close to 1 means the isochrone covers almost the same area as the circle, indicating efficient travel. A reachfactor much less than 1 indicates that the actual reachable area is much less than the circle, suggesting less efficient travel due to factors like road layout, traffic conditions, etc.s
A parameter that returns population statistics from the Global Human Settlement Layer (GHSL). When you request an isochrone, you can include total_pop in the list of attributes to get information about the total population within each isochrone. This can be useful for various types of analysis. For example, if you’re planning a new store location, you might want to know the total population within a 15-minute drive of the potential location. The TotalPop attribute can provide this information.
An arbitrary identification that will be returned in the response.
When you’re generating isochrones, the Intersections boolean parameter specifies whether to return intersecting polygons. If Intersections is set to true, the service will return all isochrones, even if they overlap or intersect with each other. This can be useful if you want to see all possible areas reachable from multiple points, even if those areas overlap. If Intersections is set to false, the service will only return the unique areas, removing any overlaps or intersections. This can be useful if you want to see the total unique area reachable from multiple points.
parameter is used when generating isochrones or equidistants and a single range value is given. The Interval parameter specifies the intervals at which additional isochrones should be generated within the given range. The value of the Interval is in seconds for time and meters for distance. For example, if you set the Range to 900 (seconds or meters) and the Interval to 300, the isochrone service will return three isochrones: one for 300 units, one for 600 units, and one for 900 units.
specifies whether a location is treated as a starting point or a destination. Start (0): The location is treated as the starting point of the route. This is where the route begins. Destination (1): The location is treated as the destination or goal of the route. This is where the route ends.
Defines the extent of the area that can be reached or covered from a specific point within a given time or distance. Time (0): The range is defined in terms of time. It represents the maximum amount of time it takes to travel from the starting point to the boundary of the isochrone. Distance (1): The range is defined in terms of distance. It represents the maximum distance that can be covered from the starting point to the boundary of the isochrone. This parameter is crucial when generating isochrones to visualize the area of reachability based on either time or distance constraints. Seconds for time and metres for distance.
The smoothing parameter applies a level of generalization to the isochrone polygons generated1. The value for smoothing is a float between 0 and 1. A higher value closer to 1 will result in a more generalized shape, meaning the isochrone polygon will have fewer edges and corners, making it appear smoother. Conversely, a lower value closer to 0 will result in a less generalized shape, meaning the isochrone polygon will have more edges and corners, making it appear more detailed. This parameter can be useful when you want to control the level of detail in the isochrone polygons. For example, if you’re visualizing the data and prefer a smoother appearance, you might choose a higher smoothing value.
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