In June 2014 the Authoritative Streets and Places (ASP) database was decommissioned, and at the same time a new Landonline SUFI was created for each unique road name / locality combination in the Landonline Road Name table. Prior to this change the Landonline Road Name table held the ASP Street SUFI in its Locality field, and a join was made between these two tables in order to populate the Landonline Locality field with the ASP locality name prior to release on the LDS. Following this change the Locality field in the Landonline Road Name table was updated to show the locality name as held in the ASP Street table. This table shows the mapping between the new Landonline Road Name SUFI and the old ASP Street SUFI. The Topo50 Road Centrelines data previously included the name_id attribute (equivalent to asp_sufi), which has now been changed to the new rna_sufi attribute (equivalent to landonline_sufi).

This layer has been provided to identify the coverage of digitised and released historic aerial photos for Mainland NZ flown on behalf of the Crown between 1936 and 2005. The layer shows the extents of the aerial surveys released by LINZ under open license. The [NZ Aerial Photo Footprints, Mainland NZ, (1936-2005) polygons](https://data.linz.govt.nz/layer/1002-nz-aerial-photo-footprints-mainland-nz-1936-2005-polygons/) layer shows the extent of each photograph in the survey and provide metadata for the individual photos. See: [https://www.flickr.com/photos/135346658@N08/albums](https://www.flickr.com/photos/135346658@N08/albums) for access to the photos. **The photos are not downloadable from the LINZ Data Service.** Please note that the process to make the scanned photos openly available is still under development, and the distribution mechanism may change. These first ten surveys are made available to showcase the content of the archive and what users can expect access to. Once we have established the long-term distribution mechanism LINZ’s goal is to periodically add surveys to this layer as they become available. We expect this distribution mechanism will be established near the end of 2015 and the next release of surveys will occur at that time. See: [http://www.linz.govt.nz/about-linz/what-were-doing/projects/crown-historic-aerial-photo-archive-scanning-project](http://www.linz.govt.nz/about-linz/what-were-doing/projects/crown-historic-aerial-photo-archive-scanning-project) for information about the Crown historic aerial photo archive digitisation project. The original data used to create this layer was compiled prior to 2000 and it is possible that some errors exist in the data fields. If you are aware of any inaccuracies, please contact LINZ: info@linz.govt.nz or +64 4 4600110.

The Gisborne 1926 to NZVD2016 Conversion Raster provides users with a two arc-minute (approximately 3.6 kilometres) raster image of the conversion of normal-orthometric heights from the Gisborne 1926 local vertical datum to the New Zealand Vertical Datum 2016 (NZVD2016). The conversion value is represented by the attribute “O”, in metres. This conversion and NZVD2016 are formally defined in the LINZ standard [LINZS25009](http://www.linz.govt.nz/regulatory/25009). The height conversion grid models the difference between the Gisborne 1926 vertical datum and NZVD2016 using the LINZ GPS-levelling marks. From the GPS-levelling marks the expected accuracy is better than 2 centimetres (95% Confidence interval). More information on converting heights between vertical datums can be found [on the LINZ website](http://www.linz.govt.nz/data/geodetic-services/coordinate-conversion/converting-between-nzvd2016-nzgd2000-and-local-vertical-datums).

The Nelson 1955 to NZVD2016 Conversion Raster provides users with a two arc-minute (approximately 3.6 kilometres) raster image of the conversion of normal-orthometric heights from the Nelson 1955 local vertical datum to the New Zealand Vertical Datum 2016 (NZVD2016). The conversion value is represented by the attribute “O”, in metres. This conversion and NZVD2016 are formally defined in the LINZ standard [LINZS25009](http://www.linz.govt.nz/regulatory/25009). The height conversion grid models the difference between the Nelson 1955 vertical datum and NZVD2016 using the LINZ GPS-levelling marks. From the GPS-levelling marks the expected accuracy is better than 2 centimetres (95% Confidence interval). More information on converting heights between vertical datums can be found [on the LINZ website](http://www.linz.govt.nz/data/geodetic-services/coordinate-conversion/converting-between-nzvd2016-nzgd2000-and-local-vertical-datums).

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

The Dunedin-Bluff 1960 to NZVD2016 Conversion Raster provides users with a two arc-minute (approximately 3.6 kilometres) raster image of the conversion of normal-orthometric heights from the Dunedin-Bluff 1960 local vertical datum to the New Zealand Vertical Datum 2016 (NZVD2016). The conversion value is represented by the attribute “O”, in metres. This conversion and NZVD2016 are formally defined in the LINZ standard [LINZS25009](http://www.linz.govt.nz/regulatory/25009). The height conversion grid models the difference between the Dunedin-Bluff 1960 vertical datum and NZVD2016 using the LINZ GPS-levelling marks. From the GPS-levelling marks the expected accuracy is better than 2 centimetres (95% Confidence interval). More information on converting heights between vertical datums can be found [on the LINZ website](http://www.linz.govt.nz/data/geodetic-services/coordinate-conversion/converting-between-nzvd2016-nzgd2000-and-local-vertical-datums).

The Auckland 1946 to NZVD2016 Conversion Raster provides users with a two arc-minute (approximately 3.6 kilometres) raster image of the conversion of normal-orthometric heights from the Auckland 1946 local vertical datum to the New Zealand Vertical Datum 2016 (NZVD2016). The conversion value is represented by the attribute “O”, in metres. This conversion and NZVD2016 are formally defined in the LINZ standard [LINZS25009](http://www.linz.govt.nz/regulatory/25009). The height conversion grid models the difference between the Auckland 1946 vertical datum and NZVD2016 using the LINZ GPS-levelling marks. From the GPS-levelling marks the expected accuracy is better than 2 centimetres (95% Confidence interval). More information on converting heights between vertical datums can be found [on the LINZ website](http://www.linz.govt.nz/data/geodetic-services/coordinate-conversion/converting-between-nzvd2016-nzgd2000-and-local-vertical-datums).

The Dunedin 1958 to NZVD2016 Conversion Raster provides users with a two arc-minute (approximately 3.6 kilometres) raster image of the conversion of normal-orthometric heights from the Dunedin 1958 local vertical datum to the New Zealand Vertical Datum 2016 (NZVD2016). The conversion value is represented by the attribute “O”, in metres. This conversion and NZVD2016 are formally defined in the LINZ standard [LINZS25009](http://www.linz.govt.nz/regulatory/25009). The height conversion grid models the difference between the Dunedin 1958 vertical datum and NZVD2016 using the LINZ GPS-levelling marks. From the GPS-levelling marks the expected accuracy is better than 2 centimetres (95% Confidence interval). More information on converting heights between vertical datums can be found [on the LINZ website](http://www.linz.govt.nz/data/geodetic-services/coordinate-conversion/converting-between-nzvd2016-nzgd2000-and-local-vertical-datums).

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. This layer contains coordinates computed from GNSS fast static and network RTK surveys undertaken after the Canterbury earthquakes. It also includes Lyttelton Vertical Datum 1937 and Christchurch Drainage Datum heights, derived from the GNSS data. **Users may also be interested in the simplified data in the companion layer [Canterbury Earthquake Geodetic Marks (2010, 2011) - Simple](http://data.linz.govt.nz/layer/1589).** 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 and other public and private organisations. No precise levelling data has been used. The uncertainty (one standard deviation) is 0.02m horizontally, and 0.03m vertically for NZGD2000 ellipsoidal heights. The uncertainty (one standard deviation) of the Lyttelton Vertical Datum 1937 and Christchurch Drainage Datum heights is 0.05m. The coordinates calculated prior to 2010-09-04 have been calculated from a combined adjustment including LINZ data and additional data provided by public and private organisations. These coordinates differ from those in the Geodetic Database and more accurately reflect the position of the mark immediately prior to the 2010-09-04 earthquake. 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. Lyttelton Vertical Datum 1937 heights have been computed from NZGD2000 ellipsoidal heights by subtracting NZGeoid2009 geoid heights and adding an offset of 0.47m to bring in terms of Lyttelton Vertical Datum 1937. Christchurch Drainage Datum (CDD) heights have been computed in the Christchurch area from NZGD2000 ellipsoidal heights by subtracting NZGeoid2009 geoid heights and adding an offset of 0.523m (specifically calculated for Christchurch City) to bring in terms of Lyttelton Vertical Datum 1937 (for Christchurch) and a further offset of 9.04m to bring in terms of CDD. The model used to estimate whether movements greater than 2cm occurred at a mark (excluding those due to liquefaction or other localised deformation) after the 2010-09-04 earthquake was provided by GNS Science (Darfield_Sep2010_model_8.5_grid_displacements_calcs.xls). The model used to estimate whether movements greater than 2cm occurred at a mark (excluding those due to liquefaction or other localised deformation) after the 2011-02-22 earthquake was provided by GNS Science (Chch_Feb2011_geodetic_source_model_3.21.xls). The model used to estimate whether movements greater than 2cm occurred at a mark (excluding those due to liquefaction or other localised deformation) after the 2011-06-13 earthquake was provided by GNS Science (Chch_Jun2011_geodetic_source_model_0.4.xls). The model used to estimate whether movements greater than 2cm occurred at a mark (excluding those due to liquefaction or other localised deformation) after the 2011-12-23 earthquake was provided by GNS Science (Chch_Dec2011_geodetic_source_model_0.2.xls). These coordinates are suitable for use in surveys and other geospatial activities in Canterbury and Christchurch. **For full 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.**

Note: LINZ and Opus International have recently agreed a contract for the maintenance of the Crown aerial imagery archive, following the liquidation of New Zealand Aerial Mapping in September 2014. The following Information on product sales has been updated to reflect this. This layer has been provided to enable potential users to identify the coverage of photography for Mainland NZ flown on behalf of the Crown between 1936 and 2005. Areas flown outside of Mainland NZ will be added later. The original data used to create this layer was compiled prior to 2000 and it is possible that some errors exist in the data fields. If you are aware of any inaccuracies, please contact LINZ: info@linz.govt.nz or +64 4 4600110. The layer shows the extent of each aerial survey undertaken. The 'NZ Aerial Photo Footprints 1936-2005 poly' layer shows the extent of each photograph in the survey. The Collection exists as photographic negatives (most are not in digital form) so the images are not downloadable from the LDS. The Crown Aerial Film Negative Collection is managed for LINZ by Opus International. You can are order images from the Collection from Opus International in a number of formats, including: - contact prints - enlargements - digital files - precision scans for photogrammetric production - orthophotos You will need to tell Opus NZ the survey number (the value in the ‘SURVEY’ attribute) covering your area of interest. Opus NZ will be able to provide information about the cost of providing images in the various formats. Contact them at: photosales@opus.co.nz or 0800 680 690 There are a small number of images held in the Collection that have not been referenced in the LDS layers due to incomplete metadata. LINZ is currently investigating ways this can be remedied. Opus International will be able to let you know if additional photographs are available in your area of interest. There are also a large number of images which previously belonged to New Zealand Aerial Mapping and which are now are available for public use. The extents of these may be added to the LDS in future. You can order these images by contacting Opus International.