anchor.diff:  WPUK,CG,no,Waipukurau,-40.06420523,176.44059928,344.435,NZGD2000,2006-04-19T00:00:00Z,9999-01-01T00:00:00Z
   WRA1,XX,no,Wairau Valley temporary,-41.595477374,173.586375972,529.5565,WGS84,2016-11-15T00:00:00Z,2017-05-28T00:00:00Z
   WRAU,CG,no,Wairau Valley,-41.595006111,173.586157714,536.3704,WGS84,2017-02-12T00:00:00Z,9999-01-01T00:00:00Z
  -WRPA,LI,no,Wairarapa,-41.062568733,175.583233327,204.802,NZGD2000,2016-01-06T00:00:00Z,9999-01-01T00:00:00Z
  +WRPA,LI,no,Wairarapa,-41.062568742,175.583233291,204.8075,NZGD2000,2016-01-06T00:00:00Z,9999-01-01T00:00:00Z
   YALD,CG,no,Yaldhurst,-43.490771093,172.481135613,64.653,NZGD2000,2014-09-16T00:00:00Z,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,-38.74271665,176.0809947,427.0279,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,-42.215018,172.790212,1833.1,WGS84,2016-11-16T00:00:00Z,9999-01-01T00:00:00Z
  
negative.code: ANAU,CG,no,Anaura Bay,-38.268212852,178.291223348,229.304,WGS84,2010-10-18T00:00:00Z,9999-01-01T00:00:00Z
  ARTA,CG,no,Aratiatia Dam,-38.61758168,176.136412112,369.723,NZGD2000,2008-11-05T00:00:00Z,9999-01-01T00:00:00Z
  ATIA,XX,no,Aratiatia Dam,-38.61757094,176.1364247,369,NZGD2000,2006-10-12T00:00:00Z,2006-11-08T00:00:00Z
  AUCK,LI,yes,Whangaparaoa No 3,-36.602844642,174.834385456,132.6823,NZGD2000,1995-09-18T00:00:00Z,9999-01-01T00:00:00Z
  AUKT,GN,no,Auckland Tide Gauge,-36.8437546,174.7704204,40.1,WGS84,2009-09-22T00:00:00Z,9999-01-01T00:00:00Z
  AVLN,CG,no,Avalon Sound Stage,-41.196440847,174.932860198,39.552,NZGD2000,2006-02-24T00:00:00Z,9999-01-01T00:00:00Z
  BHST,CG,no,Black Hill Station,-39.489184001,176.063174364,882.479,NZGD2000,2008-06-12T00:00:00Z,9999-01-01T00:00:00Z
  BIRF,CG,no,Birch Farm,-40.67976734,176.24610828,308.983,NZGD2000,2005-01-26T00:00:00Z,9999-01-01T00:00:00Z
  BLUF,LI,no,Bluff,-46.58506442,168.292086628,124.6403,NZGD2000,2004-03-05T00:00:00Z,9999-01-01T00:00:00Z
  BM8A,XX,no,8A Balmoral Lane,-43.557364295,172.732502262,37.65,WGS84,2013-01-29T00:00:00Z,2016-05-06T00:00:00Z
  BNET,SA,no,Burnett Rock,-43.862486612,170.190142352,757.772,NZGD2000,2005-02-15T00:00:00Z,9999-01-01T00:00:00Z
  BTHL,CG,no,Battery Hill,-41.340489746,175.136541284,78.839,NZGD2000,2009-01-13T00:00:00Z,9999-01-01T00:00:00Z
  CAST,CG,no,Castlepoint Station,-40.90981771,176.20155589,173.636,NZGD2000,2006-02-08T00:00:00Z,9999-01-01T00:00:00Z
  CHAT,LI,yes,Chatham Island,-43.955786909,-176.56583897,57.9744,NZGD2000,1995-10-04T00:00:00Z,2012-05-23T00:00:00Z
  CHTI,LI,yes,Chatham Island North,-43.735476523,-176.617110212,75.6784,NZGD2000,2007-12-10T00:00:00Z,9999-01-01T00:00:00Z
  CKID,CG,no,Cape Kidnappers,-39.65787439,177.07635309,234.903,NZGD2000,2006-05-23T00:00:00Z,9999-01-01T00:00:00Z
  CLIM,CG,no,Mt. Climie,-41.14466931,175.14547309,830.724,NZGD2000,2005-10-18T00:00:00Z,9999-01-01T00:00:00Z
  CLRR,CG,no,Clarence River,-42.144605449,173.815394015,922.9363,WGS84,2017-02-12T00:00:00Z,9999-01-01T00:00:00Z
  