MHWS10 line for Wellington Region

Mean High Water Springs-10 (MHWS10) line for the Greater Wellington Region, NZ. MHWS10 is the mean high water spring tide exceeded 10 percent of the time. It is often used as a practical high tide level for infrastructure design works, and also for estimating extreme high (e.g. the 100-year Average Recurrence Interval) storm tides.Line extracted from a LIDAR DEM dated 2013 at 1m cell-size. LIDAR specification was for a ground model of +/-0.1 to 0.15m in z (1 sigma) with a resolution of 1.3 points per square metre. The line corresponds to an elevation contour defined from known tidal heights as offsets above the Wellington 1953 vertical datum. The elevation value in metres is provided with each line segment. The elevation value is derived from values in Appendices A and B in this report : http://www.pce.parliament.nz/media/1384/national-and-regional-risk-exposure-in-low-lying-coastal-areas-niwa-2015.pdf Also points showing tidal elevations relative to Wgtn VD 1953.

Data and Resources

Additional Info

Field Value
Theme ["geospatial"]
Author Greater Wellington Regional Council
Maintainer Geoffrey Lewis
Maintainer Email Geoffrey Lewis
Source http://data-gwrc.opendata.arcgis.com/datasets/782327305e22466aaa0c8ad2afc0f0d6_1
Created 2017-09-12T03:50:19.000Z
Date modified 2018-10-09T19:58:23.000Z
Language English
Spatial {"type": "Polygon", "coordinates": [[[174.5975, -41.6253], [176.3803, -41.6253], [176.3803, -40.69], [174.5975, -40.69], [174.5975, -41.6253]]]}
Source Identifier http://data-gwrc.opendata.arcgis.com/datasets/782327305e22466aaa0c8ad2afc0f0d6_1
Record created September 26, 2017, Last Updated April 2, 2019