org.opentripplanner.analyst.core

Class WeightingFunction.SharpCutoff

java.lang.Object

org.opentripplanner.analyst.core.WeightingFunction

org.opentripplanner.analyst.core.WeightingFunction.SharpCutoff

Enclosing class:

WeightingFunction

public static class WeightingFunction.SharpCutoff
extends WeightingFunction

The typical hard cutoff used to select all objects within an isochrone curve. WARNING: This can have nefarious effects on accessibility indicators when the opportunity density surface contains steep gradients (e.g. Manhattan). Any misalignment in the before/after travel time surfaces near these gradients (for example due to street length roundoff errors) will create a sharp bidirectional fringe x0 minutes away in the resulting accessibility indicator surface, frequently in outlying low-accessibility areas where the echo will overwhelm the local indicator value, showing impossible decreases in accessibility in a clearly superior network.

Nested Class Summary

Nested classes/interfaces inherited from class org.opentripplanner.analyst.core.WeightingFunction

WeightingFunction.Logistic, WeightingFunction.SharpCutoff

Constructor Summary

Constructors

Constructor and Description
SharpCutoff()

Method Summary

Modifier and Type	Method and Description
int[]	apply(int[] countsPerSecond) Weight the counts (binned by second, so countsPerSecond[i] is destinations reachable in i - i + seconds) and return the output of this weighting function as a _cumulative distribution_.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

SharpCutoff

public SharpCutoff()

Method Detail

apply

public int[] apply(int[] countsPerSecond)

Description copied from class: WeightingFunction

Weight the counts (binned by second, so countsPerSecond[i] is destinations reachable in i - i + seconds) and return the output of this weighting function as a _cumulative distribution_.

Specified by:

apply in class WeightingFunction