In order to gauge the status of Thai highways in Open Street Map it is useful to compare the difference between a list of highways in Open Street Map that have a reference number (eg. 3, 31, 301, สป.1005 etc.) associated with them already and the official highway registry.There are two main types of highways in Thailand, the National Highway managed by the Department of Highways with a list on Wikipedia and the rural highways now managed by their respective local governing bodies with a list scraped from the Department of Rural Roads. This gives us a master list of 13,408 highways.
With OSM a list was acquired by downloading a daily dump of Thailand from Geofabrik and getting a list of highways with the Key ‘ref’ in it. This got us a total of 3,026 highways. Relations weren’t taken into account because only a ballpark was needed and there are not that many relations.
We look for the reference numbers that exists in OSM that also exists in the master list. The result is that there are only 1,640. I have made a list of ways which exist in OSM but doesn’t exist in the master list available for further scrutiny. Some of these are trivial such as the usage of ซ instead of ช or the use of xx notation in the rural road numbers, others will require further investigation.
Copyright © 2014. All Rights Reserved.