anchor.diff:  VGWN,CG,no,Wahianoa,-39.32692751,175.597857026,1564.718,NZGD2000,2005-05-18T00:00:00Z,9999-01-01T00:00:00Z
   VGWT,CG,no,West Tongariro,-39.115141445,175.589695416,1189.705,NZGD2000,2004-03-19T00:00:00Z,9999-01-01T00:00:00Z
   WAHU,CG,no,Waihua,-39.077210643,177.234413566,219,NZGD2000,2009-01-01T00:00:00Z,9999-01-01T00:00:00Z
  -WAIM,LI,no,Waimate,-44.655704985,170.920302371,1044.8612,NZGD2000,2004-12-15T00:00:00Z,9999-01-01T00:00:00Z
  +WAIM,LI,no,Waimate,-44.65570500069,170.92030236325,1044.8603,NZGD2000,2004-12-15T00:00:00Z,9999-01-01T00:00:00Z
   WAKA,SA,no,Waka Mara,-43.5840269,169.8853067,1416.1,WGS84,2000-11-02T00:00:00Z,9999-01-01T00:00:00Z
  -WANG,LI,no,Wanganui,-39.786881172,174.821447299,289.6695,NZGD2000,2003-04-10T00:00:00Z,9999-01-01T00:00:00Z
  -WARK,LI,yes,Warkworth,-36.434414348,174.662779361,111.2739,NZGD2000,2009-01-01T00:00:00Z,9999-01-01T00:00:00Z
  -WEST,LI,no,Westport,-41.744746794,171.806222588,665.377,NZGD2000,2004-09-22T00:00:00Z,9999-01-01T00:00:00Z
  -WGTN,LI,yes,Wellington Airport,-41.323457204,174.805893995,26.0344,NZGD2000,1996-05-17T00:00:00Z,9999-01-01T00:00:00Z
  -WGTT,GN,no,Wellington Tide Gauge,-41.290439512,174.781595515,42.9673,NZGD2000,1999-12-14T00:00:00Z,9999-01-01T00:00:00Z
  -WHKT,LI,no,Whakatane,-37.98168633,177.013877908,231.833,NZGD2000,2009-03-23T00:00:00Z,9999-01-01T00:00:00Z
  -WHNG,LI,no,Whangarei,-35.80377163,174.314566474,172.7729,NZGD2000,2003-04-09T00:00:00Z,9999-01-01T00:00:00Z
  +WANG,LI,no,Wanganui,-39.78688114101,174.82144728767,289.6678,NZGD2000,2003-04-10T00:00:00Z,9999-01-01T00:00:00Z
  +WARK,LI,yes,Warkworth,-36.43441434744,174.66277935557,111.2731,NZGD2000,2009-01-01T00:00:00Z,9999-01-01T00:00:00Z
  +WEST,LI,no,Westport,-41.74474683265,171.80622269874,665.3769,NZGD2000,2004-09-22T00:00:00Z,9999-01-01T00:00:00Z
  +WGTN,LI,yes,Wellington Airport,-41.32345717683,174.8058940754,26.0387,NZGD2000,1996-05-17T00:00:00Z,9999-01-01T00:00:00Z
  +WGTT,GN,no,Wellington Tide Gauge,-41.2904394757,174.78159561152,42.9724,NZGD2000,1999-12-14T00:00:00Z,9999-01-01T00:00:00Z
  +WHKT,LI,no,Whakatane,-37.98168633129,177.01387791014,231.8318,NZGD2000,2009-03-23T00:00:00Z,9999-01-01T00:00:00Z
  +WHNG,LI,no,Whangarei,-35.80377163226,174.31456647013,172.7702,NZGD2000,2003-04-09T00:00:00Z,9999-01-01T00:00:00Z
   WHVR,CG,no,Whangaehu Valley Road,-39.730097955,175.451742011,690.052,WGS84,2011-09-30T00:00:00Z,9999-01-01T00:00:00Z
   WITH,CG,no,Wither Hills,-41.5606413,173.9842523,408,NZGD2000,2009-11-09T00:00:00Z,9999-01-01T00:00:00Z
   WMAT,CG,no,Waiomatatini,-37.825,178.4087,356,WGS84,2010-03-15T00:00:00Z,9999-01-01T00:00:00Z
  
positive.code: SUTT,CG,no,Sutton,-45.63416,170.13928,411,WGS84,2016-05-26T00:00:00Z,9999-01-01T00:00:00Z
  TAKL,GN,no,Auckland Tide Gauge,-36.8436,174.7699,50,NZGD2000,2001-07-11T00:00:00Z,2007-07-05T00:00:00Z
  TAKP,CG,no,Takapari Road,-40.061564113,175.962920076,698.854,NZGD2000,2004-01-14T00:00:00Z,9999-01-01T00:00:00Z
  TAUP,LI,no,Taupo Airport,-38.742716717,176.080994664,427.0231,NZGD2000,2002-03-22T00:00:00Z,9999-01-01T00:00:00Z
  TAUW,CG,no,Tauwhareparae,-38.162424733,178.005876841,713.456,NZGD2000,2009-01-01T00:00:00Z,9999-01-01T00:00:00Z
  TEMA,CG,no,Te Maipa,-41.106566527,175.890463218,515.1993,NZGD2000,2007-02-12T00:00:00Z,9999-01-01T00:00:00Z
  TEN2,XX,no,Lake Tennyson Temporary,-42.215018017,172.790212164,1833.0459,WGS84,2016-11-16T00:00:00Z,2018-05-22T00:00:00Z
  
negative.code: NIUM,GN,yes,Niue Meteorological Station,-19.076565719,-169.927066765,90.121,WGS84,2005-09-14T00:00:00Z,9999-01-01T00:00:00Z
  NLS1,XX,no,Nelson Landslide 1,-41.278281772,173.255763078,66.573,NZGD2000,2011-12-19T00:00:00Z,2013-11-14T00:00:00Z
  NLS2,XX,no,Nelson Landslide 2,-41.278147,173.254006,35,WGS84,2011-12-20T00:00:00Z,2013-11-14T00:00:00Z
  NLSN,LI,no,Nelson,-41.18350854562,173.43373048508,302.1197,NZGD2000,2004-02-06T00:00:00Z,9999-01-01T00:00:00Z
  NMAI,CG,no,Naumai,-39.09704167,176.806622735,857.565,NZGD2000,2008-04-07T00:00:00Z,9999-01-01T00:00:00Z
  NPLY,LI,no,New Plymouth,-39.18255748763,174.1181740614,416.9224,NZGD2000,2003-03-20T00:00:00Z,9999-01-01T00:00:00Z
  NRRD,CG,no,North Range Road,-40.385438526,175.761337945,500.701,NZGD2000,2008-03-27T00:00:00Z,9999-01-01T00:00:00Z
  NRSW,CG,no,Norsewood,-40.113323422,176.200037533,364.054,NZGD2000,2011-01-18T00:00:00Z,9999-01-01T00:00:00Z
  OHIN,CG,no,Ohingaiti,-39.918289832,175.790675494,530.658,NZGD2000,2008-09-03T00:00:00Z,9999-01-01T00:00:00Z
  