Travel Times by Transportation Mode in Nairobi, Kenya

This directory contains data files that describe travel times in<br> Nairobi, Kenya. Three different modes of transportation are included: - Walking, according to MapQuest and filled in with Google Maps where<br> MapQuest fails to find a route. - Driving, under normal traffic conditions. - Matatus, the informal public transportation network. The travel times are computed from a gridded origin location to a<br> collection of gridded destination locations. In the directories, each<br> file contains destination location times for a given origin location.<br> These are titled &lt;mode&gt;-###.csv. The CSV is organized from north to<br> south, along rows, and west to east, along columns. An additional<br> &lt;mode&gt;.csv file in each directory gives the organization of the<br> numbered files, again from north to south, along rows, and west to<br> east, along columns. There are also "extended" versions of each grid, with larger<br> destination grids for each origin point, formed by "daisy-chaining"<br> together the original destination grids. The directory also contains source files for working with the data: - calc_access.R shows how to calculate a simple mobility measure,<br> using the functions in tools_calc_access.R - tools_analyze.R are a more general set of functions for performing<br> arbitrary callback-based operations on the travel time data. - tools_calc_access.R contains underlying functions for setting up<br> access to the grids and calculating access. - tools_map.R contains the grid origin and destination definitions<br> and functions for plotting.