distance_to_position_sphere_test

distance_to_position_sphere_test, a MATLAB code which calls distance_to_position_sphere(), which estimates the positions of cities given a city-to-city distance table. The cities are presumed to lie on a sphere, and to be sufficiently separated that the curvature of the sphere must be accounted for.

Licensing:

The computer code and data files described and made available on this web page are distributed under the MIT license

Related Data and Programs:

distance_to_position_sphere, a MATLAB code which estimates the positions of cities on a sphere (such as the earth) based on a city-to-city distance table.

Source Code:

• distance_to_position_sphere_test.m, calls all the tests.
• distance_to_position_sphere_test.sh, runs all the tests.
• distance_to_position_sphere_test.txt, the output file.

HA30 is a dataset of spherical distances for 30 cities, as selected by Hartigan from the World Almanac, 1966.

• ha30_name.txt, the names of the cities.
• ha30_dist.txt, the distance table for the cities. Distances are measured in hundreds of miles.
• ha30_output.txt, printed output in response to the command

  distance_to_position_sphere ( 'ha30_dist.txt', 39.59 )

• ha30_dist.latlon.txt, the latitudes and longitudes (in degrees) that best fit the distance table.
• ha30_dist.xyz.txt, the XYZ coordinates corresponding to the latitudes and longitudes.
• ha30_dist.dist2.txt, the distance table, as recomputed from the latitudes and longitudes.