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This article or section may contain out-of-date information. The information may no longer be correct, or may no longer have relevance. If you know about the current state of affairs, please help keep everyone informed by updating this information. (Discussion) Data sources Aerial imagery In addition to a survey with GPS one may also use some aerial images if available with a suitable license. Landsat provides low-resolution satellite imagery of the whole country and is available with different image modes. While Bing aerial imagery is available in many parts of the world and is the default layer in ID editor, it can be very outdated in rural areas of Thailand (often +5 years). A recommended alternative with more recent imagery is Maxar and ESRI. Official sources Legislation and other official proclamations by the Royal Thai Government are exempt from copyright protection. Maps accompanying documents published in the Royal Thai Government Gazette (available at http://mratchakitcha.soc.go.th/ ) may be useful as sources for manual tracing (e.g. of national parks). GIS data is available from several government agencies, but are presumed to be protected by copyright and unsuitable for import. The Department of Highways provides a publicly accessible database of national highways at http://roadnet.doh.go.th. As above, the data is considered unsuitable for systematic import, but is useful as a source for confirmation of data and quality assurance. The Department of Rural Roads publishes indices of rural highways at http://maintenance.drr.go.th/th/DRR. They include route numbers and names (which typically describe the route's start and end points), location, length, and start and end coordinates (although the coordinates appear quite unreliable). The local highway registry is available at http://lmp.drr.go.th/lmp/waydata/main.html.