anchor.diff:  MCNL,GeoNet,GNS,TRIMBLE NETRS,GPS,30s,4,geonet,trimble_5700 x4,2008-05-27T00:05:00Z,2018-05-22T05:33:37Z
   MCNL,GeoNet,GNS,TRIMBLE NETR9,GPS+GLO,30s,0,geonet,trimble_netr9 x4,2018-05-22T05:33:38Z,2019-10-03T01:07:59Z
   MCNL,GeoNet,GNS,TRIMBLE ALLOY,GPS+GLO,30s,0,geonet,trimble_netr9 x4,2019-10-03T01:08:00Z,9999-01-01T00:00:00Z
  -METH,GeoNet,GNS,TRIMBLE NETR9,GPS+GLO,30s,4,linz,trimble_netr9 x4,2010-10-12T00:24:01Z,2014-07-27T21:49:59Z
  +METH,GeoNet,GNS,TRIMBLE NETR9,GPS+GLO,30s,4,linz,trimble_netr9 x4,2010-10-12T00:24:01Z,2010-12-21T01:40:00Z
  +METH,GeoNet,GNS,TRIMBLE NETR9,GPS+GLO,30s,3,linz,trimble_netr9 x4,2010-12-21T01:40:01Z,2014-07-27T21:49:59Z
   METH,GeoNet,GNS,TRIMBLE NETR9,GPS+GLO,30s,0,linz,trimble_netr9 x4,2014-07-27T21:50:44Z,2016-04-11T17:09:37Z
   METH,GeoNet,GNS,TRIMBLE NETR9,GPS+GLO+GAL+BDS+QZSS,30s,0,linz,trimble_netr9 x4,2016-04-11T17:09:38Z,2019-09-19T01:15:31Z
   METH,GeoNet,GNS,TRIMBLE ALLOY,GPS+GLO+GAL+BDS+QZSS,30s,0,linz,trimble_netr9 x4,2019-09-19T01:15:32Z,9999-01-01T00:00:00Z
  
positive.code: WAKA,GeoNet,GNS,TRIMBLE NETR9,GPS+GLO,30s,0,sagenz,trimble_netr9 x4,2014-07-10T00:00:00Z,9999-01-01T00:00:00Z
  WANG,GeoNet,GNS,TRIMBLE 5700,GPS,30s,4,linz,trimble_5700 x5,2003-04-17T23:59:00Z,2007-01-18T03:00:00Z
  WANG,GeoNet,GNS,TRIMBLE NETRS,GPS,30s,4,linz,trimble_5700 x4,2007-01-18T21:00:00Z,2010-11-04T00:00:00Z
  WANG,GeoNet,GNS,TRIMBLE NETR9,GPS+GLO,30s,4,linz,trimble_netr9 x4,2010-11-04T00:01:01Z,2015-04-09T17:05:29Z
  WANG,GeoNet,GNS,TRIMBLE NETR9,GPS+GLO,30s,0,linz,trimble_netr9 x4,2015-04-09T17:05:30Z,2016-07-26T17:04:00Z
  WANG,GeoNet,GNS,TRIMBLE NETR9,GPS+GLO+GAL+BDS+QZSS,30s,0,linz,trimble_netr9 x4,2016-07-26T17:04:01Z,2019-10-15T00:08:15Z
  WANG,GeoNet,GNS,TRIMBLE ALLOY,GPS+GLO+GAL+BDS+QZSS,30s,0,linz,trimble_netr9 x4,2019-10-15T00:08:16Z,9999-01-01T00:00:00Z
  
negative.code: Mark,Operator,Agency,Model,Satellite System,Interval,Elevation Mask,Header Comment,Format,Start Date,End Date
  2406,GeoNet,GNS,TRIMBLE NETR9,GPS+GLO,30s,3,geonet,trimble_netr9 x4,2012-02-13T00:38:01Z,2015-03-09T00:50:00Z
  2406,GeoNet,GNS,TRIMBLE NETR9,GPS+GLO,30s,0,geonet,trimble_netr9 x4,2015-03-09T00:50:01Z,9999-01-01T00:00:00Z
  AHTI,GeoNet,GNS,TRIMBLE NETRS,GPS,30s,4,geonet,trimble_5700 x4,2009-06-10T23:31:00Z,2015-12-07T02:04:37Z
  AHTI,GeoNet,GNS,TRIMBLE NETR9,GPS+GLO,30s,0,geonet,trimble_netr9 x4,2015-12-07T02:04:38Z,9999-01-01T00:00:00Z
  AKTO,GeoNet,GNS,TRIMBLE NETRS,GPS,30s,4,geonet,trimble_5700 x4,2006-04-27T00:01:01Z,2015-10-01T20:10:00Z
  AKTO,GeoNet,GNS,TRIMBLE NETR9,GPS+GLO,30s,0,geonet,trimble_netr9 x4,2015-10-01T21:39:00Z,9999-01-01T00:00:00Z
  ANAU,GeoNet,GNS,TRIMBLE NETR9,GPS+GLO,30s,4,geonet,trimble_netr9 x4,2010-10-18T23:35:01Z,2010-12-21T01:40:00Z
  ANAU,GeoNet,GNS,TRIMBLE NETR9,GPS+GLO,30s,3,geonet,trimble_netr9 x4,2010-12-21T01:40:01Z,2015-09-03T04:13:00Z
  ANAU,GeoNet,GNS,TRIMBLE NETR9,GPS+GLO,30s,0,geonet,trimble_netr9 x4,2015-09-03T04:13:01Z,9999-01-01T00:00:00Z
  ARTA,GeoNet,GNS,TRIMBLE NETRS,GPS,30s,4,geonet,trimble_5700 x4,2008-11-05T00:00:00Z,2016-03-21T22:28:59Z
  ARTA,GeoNet,GNS,TRIMBLE NETR9,GPS+GLO,30s,0,geonet,trimble_netr9 x4,2016-03-21T22:29:02Z,9999-01-01T00:00:00Z
  