http://inspire.ec.europa.eu/codelist/StationRankValue/1stOrderBaseINSPIRE Registry teamJRC-INSPIRE-SUPPORT@ec.europa.euhttp://inspire.ec.europa.eu/registry2015-08-18 17:31 PM CEST2015-08-18 17:31 PM CEST1st order baseHighest precision base station maintained by some authority. It is used to tie relative measurements to absolute network by third party observers.