**For further information about this dataset, see [the Kaikoura earthquake information](http://www.linz.govt.nz/land/surveying/canterbury-earthquakes/geodetic-survey-control-network/kaikoura-earthquake-%E2%80%93-14-november-2016).** It is likely that many of these coordinates will be updated multiple times as marks move due to aftershocks and ongoing post-seismic deformation. It is therefore critical that the **datum version** and **coordinate epoch** date are recorded with any coordinates sourced from this dataset, along with the date the coordinates were accessed or downloaded. These coordinates are computed from Continuously Operating Reference Station (CORS) data and geodetic surveys undertaken after the 14 November 2016 Kaikoura earthquake. They reflect earthquake movements up until the epoch date that is associated with each coordinate. Where possible, coordinates sourced from this dataset for use as control or calibration points in a project should be at the same or similar epochs. If not, post-seismic deformation may mean that new observations or coordinates do not fit well with these coordinates. Coordinates used as control or calibration points should also be well-distributed over the project area, so that any discrepancies resulting from the survey date being significantly different from the coordinate epoch date can be identified. If such discrepancies are identified, it may be necessary to use the [LINZ PositioNZ-PP online processing service](http://www.linz.govt.nz/positionzpp) to generate control coordinates at the same (or nearly the same) epoch as the survey date. Coordinates were calculated using SNAP v2.5.48. The origin of non-CORS coordinates is PositioNZ CORS that have been updated to include earthquake movements. The 95% confidence interval uncertainties of coordinates are 0.02m horizontally and 0.03m vertically, relative to the PositioNZ network, at the epoch specified. In areas experiencing significant ongoing seismic activity, coordinates at the same mark at other epochs may differ by more than these uncertainties. These coordinates are suitable for use in surveys and other geospatial positioning activities in the area impacted by the Kaikoura earthquake.

The Canterbury region of New Zealand experienced a sequence of significant earthquakes during 2010 and 2011. These earthquakes occurred on 2010-09-04, 2011-02-22, 2011-06-13 and 2011-12-23. Precise-levelling surveys have been carried out throughout Canterbury and Christchurch to re-establish heights after these earthquakes. **Users may also be interested in the horizontal coordinates derived from GNSS data in the companion layers [Canterbury Earthquake Geodetic Marks (2010, 2011) - Comprehensive](http://data.linz.govt.nz/layer/1588) and [Canterbury Earthquake Geodetic Marks (2010, 2011) - Simple](http://data.linz.govt.nz/layer/1589)** Horizontal Accuracy (standard deviation) approx 1m. Vertical Accuracy of Lyttelton Vertical Datum 1937 heights (standard deviation) 0.005m. Heights generated from precise levelling data undertaken to a misclose standard (mm) of 5*sqrt(k) where k is the distance in kilometres. Precise levelling in the Christchurch area was undertaken after the 23 December 2011 earthquake. Other areas were levelled after the most recent earthquake to have affected heights in that area. Heights therefore represent the position of marks accounting for all four substantial Canterbury earthquakes. These heights are only provisional. Analysis is ongoing as further data is collected. Heights calculated using SNAP v2.3.64. Heights were constrained using the pre-earthquake heights at geodetic codes AC9B, AFAQ, AG32 and B853. GNSS observations and modelling indicates that the height change of these marks was negligible. Some heights were calculated from precise levelling data provided by Christchurch City Council. These coordinates are suitable for use in surveys and other geospatial activities in Canterbury and Christchurch. **For further information about this dataset, see [the Canterbury earthquake information](http://www.linz.govt.nz/survey-titles/canterbury-earthquake/canterbury-earthquake/geodetic-survey-control-coordinates) on the LINZ website.**

Coordinates computed from surveys undertaken after the 14 February 2016 Canterbury earthquake. These should be consistent with any observations made after this earthquake (neglecting any localised deformation such as that due to liquefaction). **For further information about this dataset, see [the Canterbury earthquake information](http://www.linz.govt.nz/land/surveying/canterbury-earthquakes/geodetic-survey-control-network).** These coordinates are only provisional. Analysis is ongoing as further data is collected. Coordinates were calculated using SNAP v2.5.33. Stations were constrained using coordinates of distant PositioNZ continuous GNSS stations that were unaffected by the earthquake. The standard deviations of coordinates are 0.01m horizontally and 0.02m vertically, relative to the PositioNZ network. Coordinate changes due to the earthquake have been calculated by comparing pre and post-earthquake coordinates. Pre-earthquake coordinates were calculated relative to public and private continuous GNSS stations. These continuous GNSS stations had data processed for several days early in 2016 (before the earthquake). Other pre-earthquake geodetic data was then readjusted with the continuous GNSS data. Note that this means these coordinate changes may differ slightly from those that would be calculated by comparing the post-earthquake coordinates with those currently in the Geodetic Database. These coordinates are suitable for use in surveys and other geospatial activities in Canterbury and Christchurch.

Coordinates computed from surveys undertaken after the 14 February 2016 Canterbury earthquake. These should be consistent with any observations made after this earthquake (neglecting any localised deformation such as that due to liquefaction). **For further information about this dataset, see [the Canterbury earthquake information](http://www.linz.govt.nz/land/surveying/canterbury-earthquakes/geodetic-survey-control-network).** These coordinates are only provisional. Analysis is ongoing as further data is collected. Coordinates were calculated using SNAP v2.5.33. Stations were constrained using coordinates of distant PositioNZ continuous GNSS stations that were unaffected by the earthquake. The standard deviations of coordinates are 0.01m horizontally and 0.02m vertically, relative to the PositioNZ network. Coordinate changes due to the earthquake have been calculated by comparing pre and post-earthquake coordinates. Pre-earthquake coordinates were calculated relative to public and private continuous GNSS stations. These continuous GNSS stations had data processed for several days early in 2016 (before the earthquake). Other pre-earthquake geodetic data was then readjusted with the continuous GNSS data. Note that this means these coordinate changes may differ slightly from those that would be calculated by comparing the post-earthquake coordinates with those currently in the Geodetic Database. These coordinates are suitable for use in surveys and other geospatial activities in Canterbury and Christchurch.

The Canterbury region of New Zealand experienced a sequence of significant earthquakes during 2010 and 2011. These earthquakes occurred on 2010-09-04, 2011-02-22, 2011-06-13 and 2011-12-23. The coordinates in this layer account for all significant movements relating to these, so should be consistent with any observations made after the last earthquake to affect a given area (neglecting localised deformation such as that due to liquefaction). **Users may also be interested in the more comprehensive data in the companion layer [Canterbury Earthquake Geodetic Marks (2010, 2011) - Comprehensive](http://data.linz.govt.nz/layer/1588).** These coordinates are only provisional. Analysis is ongoing as further data is collected. Coordinates were calculated using SNAP v2.3.61. Stations were constrained using coordinates calculated by GNS Science. Some coordinates were calculated from data provided by Christchurch City Council. No precise levelling data has been used. The estimated accuracy is 0.02m horizontally and 0.03m vertically. The deformation model igns2011_working.grd calculated from a model (v4) provided by GNS Science on 28 April 2011 was used to remove secular deformation. These coordinates are suitable for use in surveys and other geospatial activities in Canterbury and Christchurch. **For further information about this dataset, see [the Canterbury earthquake information](http://www.linz.govt.nz/survey-titles/canterbury-earthquake/canterbury-earthquake/geodetic-survey-control-coordinates) on the LINZ website.**

This layer details the movement of survey marks due to the Canterbury Earthquake Sequence (CES). The movements include the impact of 5 major earthquakes on 4 September 2010, 22 February 2011, 13 June 2011, 23 December 2011 and 14 February 2016. Note that these movements apply only at the survey mark. Nearby land may have moved differently, especially in areas impacted by substantial shallow ground movement. For further earthquake information, see **[the Canterbury earthquake information](http://www.linz.govt.nz/land/surveying/canterbury-earthquakes )** on the LINZ website. **Scope** Movements do not include the regular tectonic movement (not related to earthquakes) of approximately 5cm per year. As well as Christchurch, the data covers Lyttelton, Spencerville, Kaiapoi, Pines Beach, Woodend, Pegasus and Waikuku Beach. **Mark Movement Calculations** Observed mark movements have been calculated from geodetic and cadastral survey data collected at the same physical survey mark before and after the earthquakes. Various filters have been applied to ensure as far as practicable that the movements reflect real-world earthquake-related movements of marks. For example, only non-boundary marks that have been directly measured (rather than adopted) are included. Modelled mark movements have been calculated using models of the tectonic-scale movements resulting from each earthquake, supplied by GNS Science, supplemented with more detailed modelling carried out by LINZ. These models typically represent deep-seated movement only. They do not include shallow movement, such as that resulting from liquefaction. Therefore the difference between the post-earthquake observed and post-earthquake modelled position generally represents shallow ground movement. The difference between the post-earthquake modelled and pre-earthquake observed position generally represents deep-seated movement. The difference between the post-earthquake observed position and pre-earthquake observed position represents total movement due to the earthquakes. **Accuracy** The uncertainty of the coordinate changes is 0.1m at a 95% confidence interval. **Layer Attributes** - nod_id_post_eq: Landonline node id for the latest post-earthquake node (mark) - code_post_eq: Geodetic code for the latest post-earthquake node - name_post_eq: Mark name for the latest post-earthquake node - nod_id_pre_eq: Landonline node id for the pre-earthquake node (mark) - code_pre_eq: Geodetic code for the pre-earthquake node - name_pre_eq: Mark name for the pre-earthquake node - de_mod_obs: East change from modelled post-earthquake to observed post-earthquake position - dn_mod_obs: North change from modelled post-earthquake to observed post-earthquake position - hz_mod_obs: Horizontal change from modelled post-earthquake to observed post-earthquake position - bg_mod_obs: Bearing from modelled post-earthquake to observed post-earthquake position - de_pre_mod: East change from observed pre-earthquake to modelled post-earthquake position - dn_pre_mod: North change from observed pre-earthquake to modelled post-earthquake position - hz_pre_mod: Horizontal change from observed pre-earthquake to modelled post-earthquake position - bg_pre_mod: Bearing from observed pre-earthquake to modelled post-earthquake position - de_pre_obs: East change from observed pre-earthquake to observed post-earthquake position - dn_pre_obs: North change from observed pre-earthquake to observed post-earthquake position - hz_pre_obs: Horizontal change from observed pre-earthquake to observed post-earthquake position - bg_pre_obs: Bearing from observed pre-earthquake to observed post-earthquake position

**For further information about this dataset, see [the Kaikoura earthquake information](http://www.linz.govt.nz/land/surveying/canterbury-earthquakes/geodetic-survey-control-network/kaikoura-earthquake-%E2%80%93-14-november-2016).** It is likely that many of these coordinates will be updated multiple times as marks move due to aftershocks and ongoing post-seismic deformation. It is therefore critical that the **datum version** and **coordinate epoch** date are recorded with any coordinates sourced from this dataset, along with the date the coordinates were accessed or downloaded. These coordinates are computed from Continuously Operating Reference Station (CORS) data and geodetic surveys undertaken after the 14 November 2016 Kaikoura earthquake. They reflect earthquake movements up until the epoch date that is associated with each coordinate. Where possible, coordinates sourced from this dataset for use as control or calibration points in a project should be at the same or similar epochs. If not, post-seismic deformation may mean that new observations or coordinates do not fit well with these coordinates. Coordinates used as control or calibration points should also be well-distributed over the project area, so that any discrepancies resulting from the survey date being significantly different from the coordinate epoch date can be identified. If such discrepancies are identified, it may be necessary to use the [LINZ PositioNZ-PP online processing service](http://www.linz.govt.nz/positionzpp) to generate control coordinates at the same (or nearly the same) epoch as the survey date. Coordinates were calculated using SNAP v2.5.48. The origin of non-CORS coordinates is PositioNZ CORS that have been updated to include earthquake movements. The 95% confidence interval uncertainties of coordinates are 0.02m horizontally and 0.03m vertically, relative to the PositioNZ network, at the epoch specified. In areas experiencing significant ongoing seismic activity, coordinates at the same mark at other epochs may differ by more than these uncertainties. These coordinates are suitable for use in surveys and other geospatial positioning activities in the area impacted by the Kaikoura earthquake.

This layer details the movement of survey marks due to the Canterbury Earthquake Sequence (CES). The movements include the impact of 5 major earthquakes on 4 September 2010, 22 February 2011, 13 June 2011, 23 December 2011 and 14 February 2016. Note that these movements apply only at the survey mark. Nearby land may have moved differently, especially in areas impacted by substantial shallow ground movement. For further earthquake information, see **[the Canterbury earthquake information](http://www.linz.govt.nz/land/surveying/canterbury-earthquakes )** on the LINZ website. **Scope** Movements do not include the regular tectonic movement (not related to earthquakes) of approximately 5cm per year. As well as Christchurch, the data covers Lyttelton, Spencerville, Kaiapoi, Pines Beach, Woodend, Pegasus and Waikuku Beach. **Mark Movement Calculations** Observed mark movements have been calculated from geodetic and cadastral survey data collected at the same physical survey mark before and after the earthquakes. Various filters have been applied to ensure as far as practicable that the movements reflect real-world earthquake-related movements of marks. For example, only non-boundary marks that have been directly measured (rather than adopted) are included. Modelled mark movements have been calculated using models of the tectonic-scale movements resulting from each earthquake, supplied by GNS Science, supplemented with more detailed modelling carried out by LINZ. These models typically represent deep-seated movement only. They do not include shallow movement, such as that resulting from liquefaction. Therefore the difference between the post-earthquake observed and post-earthquake modelled position generally represents shallow ground movement. The difference between the post-earthquake modelled and pre-earthquake observed position generally represents deep-seated movement. The difference between the post-earthquake observed position and pre-earthquake observed position represents total movement due to the earthquakes. **Accuracy** The uncertainty of the coordinate changes is 0.1m at a 95% confidence interval. **Layer Attributes** - nod_id_post_eq: Landonline node id for the latest post-earthquake node (mark) - code_post_eq: Geodetic code for the latest post-earthquake node - name_post_eq: Mark name for the latest post-earthquake node - nod_id_pre_eq: Landonline node id for the pre-earthquake node (mark) - code_pre_eq: Geodetic code for the pre-earthquake node - name_pre_eq: Mark name for the pre-earthquake node - de_mod_obs: East change from modelled post-earthquake to observed post-earthquake position - dn_mod_obs: North change from modelled post-earthquake to observed post-earthquake position - hz_mod_obs: Horizontal change from modelled post-earthquake to observed post-earthquake position - bg_mod_obs: Bearing from modelled post-earthquake to observed post-earthquake position - de_pre_mod: East change from observed pre-earthquake to modelled post-earthquake position - dn_pre_mod: North change from observed pre-earthquake to modelled post-earthquake position - hz_pre_mod: Horizontal change from observed pre-earthquake to modelled post-earthquake position - bg_pre_mod: Bearing from observed pre-earthquake to modelled post-earthquake position - de_pre_obs: East change from observed pre-earthquake to observed post-earthquake position - dn_pre_obs: North change from observed pre-earthquake to observed post-earthquake position - hz_pre_obs: Horizontal change from observed pre-earthquake to observed post-earthquake position - bg_pre_obs: Bearing from observed pre-earthquake to observed post-earthquake position

**For further information about this dataset, see [the Canterbury earthquake information](http://www.linz.govt.nz/land/surveying/canterbury-earthquakes/information-for-canterbury-surveyors-post-earthquake-cadastral ).** Coordinates computed by adding the effects of deep-seated movement to survey points that had authoritative survey-accurate digital cadastre (SDC) coordinates immediately prior to 4 September 2010 (the first Canterbury earthquake). Marks that did not have SDC status at that time are not included in the dataset. Deep-seated movements were evaluated using the NZGD2000 deformation model. - The 'nod_id' column is the Landonline node id. This is the unique identifier for the mark. - The 'current_name' column is the Landonline mark name. Many boundary marks do not have a name recorded in this dataset, because this information has not been digitally captured. - The 'east_mtpleatm2000' and 'north_mtpleatm2000' columns are the east and north coordinates (metres) in terms of the Mt Pleasant 2000 transverse mercator projection. Rounded to the nearest centimetre. - The 'coord_order' column is the Landonline coordinate order immediately prior to 4 September 2010. The estimated absolute uncertainty of these coordinates is 0.09m at the 95% confidence level. These coordinates are intended for the use of Licensed Cadastral Surveyors when locating boundaries in Christchurch, in accordance with the Rules for Cadastral Survey 2010 and associated guidance, particularly [guidance relating to the earthquakes](http://www.linz.govt.nz/land/surveying/canterbury-earthquakes/information-for-canterbury-surveyors-post-earthquake-cadastral).

The Canterbury region of New Zealand experienced a sequence of significant earthquakes during 2010 and 2011. These earthquakes occurred on 2010-09-04, 2011-02-22, 2011-06-13 and 2011-12-23. The coordinates in this layer account for all significant movements relating to these, so should be consistent with any observations made after the last earthquake to affect a given area (neglecting localised deformation such as that due to liquefaction). **Users may also be interested in the more comprehensive data in the companion layer [Canterbury Earthquake Geodetic Marks (2010, 2011) - Comprehensive](http://data.linz.govt.nz/layer/1588).** These coordinates are only provisional. Analysis is ongoing as further data is collected. Coordinates were calculated using SNAP v2.3.61. Stations were constrained using coordinates calculated by GNS Science. Some coordinates were calculated from data provided by Christchurch City Council. No precise levelling data has been used. The estimated accuracy is 0.02m horizontally and 0.03m vertically. The deformation model igns2011_working.grd calculated from a model (v4) provided by GNS Science on 28 April 2011 was used to remove secular deformation. These coordinates are suitable for use in surveys and other geospatial activities in Canterbury and Christchurch. **For further information about this dataset, see [the Canterbury earthquake information](http://www.linz.govt.nz/survey-titles/canterbury-earthquake/canterbury-earthquake/geodetic-survey-control-coordinates) on the LINZ website.**