Distances - geographicdeterminationlibrary - 2024.00

Geographic Determination Library Reference for Windows and z/OS

Product type
Software
Portfolio
Locate
Product family
GeoStan Geocoding Suite
Product
GeoStan Geocoding Suite > Geographic Determination Library
Version
2024.00
Language
English
Product name
GeoStan Geocoding Suite
Title
Geographic Determination Library Reference for Windows and z/OS
Topic type
Reference
Copyright
2024
First publish date
1994
ft:lastEdition
2024-05-09
ft:lastPublication
2024-05-09T00:55:21.277227

The distances referred to herein are straight line distances and do not account for the curvature of the earth. The distances calculated in GDL are very accurate for points within 50 to 100 miles of each other. As the north-south distance becomes greater, slight errors in calculations can occur. The examples in Table are for points that are oriented directly north or south of the base point, which would have the largest error for the distance given.

Table 1. Error introduced by distance from base point
North-South Distance Maximum Error
50 miles 0.25% (0.1 miles)
200 miles 0.9% (1.8 miles)
400 miles 1.25% (5 miles)
1,000 miles 1.9% (19 miles)