isochrone_esri: Issue a walkalytics isochrone query

In walkalytics: Interface to the 'Walkalytics' API for Calculating Walking Isochrones

Description

isochrone_esri calls the walkalytics isochrone API which calculates the walking isochrone for a source location and returns a repsonse object that contains a base64-encoded gzipped Esri ASCII grid with walking times for every pixel.

Usage

isochrone_esri(x, y, epsg = 3857, max_min = 1000,
  key = "my_walkalytics_key")

Arguments

x	x-coordinate of the source location (coordinate system is WGS/84 Pseudo Mercator).
y	y-coordinate of the source location (coordinate system is WGS/84 Pseudo Mercator).
epsg	EPSG code for coordinate system of the x- and y-coordinate.
max_min	maximum number of minutes for the isochrone.
key	your walkalytics subscription key which provides access to the API.

Details

To get an API key, you need to register at https://dev.walkalytics.com/signin. With the free starter account, you can make up to 100 calls a week to the API.

Value

The response object from the request. Use esri_to_sgdf to convert the base64-encoded gzipped Esri ASCII grid to an object of class SpatialGridDataFrame-class. Use pixel_walktimes to directly extract walking times for every pixel.

References

Walkalytics API documentations

Examples

isochrone_esri(x = 895815, y = 6004839, key = "abcd1234")

walkalytics documentation built on May 2, 2019, 7:02 a.m.