The NZGD2000 Meridional Circuit Boundaries as defined by LINZ. [The Rules for Cadastral Survey](http://www.linz.govt.nz/survey-titles/cadastral-surveying/publications/sg-rules/index.aspx) require surveyors to carry out surveys in terms of one of 28 Transverse Mercator meridional circuits.
The cos_id contained within this data is a reference to the Landonline coordinate system identifier For more information see crs_coordinate_system in the [Landonline BDE data dictionary documentation](http://www.linz.govt.nz/survey-titles/landonline-data/landonline-bde/bde-documentation). These polygons were digitised from an NZMS 266 map.
Original data sourced from [here](http://www.linz.govt.nz/geodetic/datums-projections-heights/projections/nzgd2000-meridional-circuits/index.aspx)
The meridional circuit boundaries were copied by hand off NZMS 177 1:50000 cadastral maps to a 1:2000000 Department of Lands and Survey map (NZMS 266) during the survey conversion project. They were later digitised to shapefile as represented in this layer.
The boundaries in this layer are not authoritative, they serve for visualisation purposes only.