landslide_susceptibility

20160526 12553100 FALSE 20240724 09314100 20240724 09314100 002 LandslideSusceptibility 1861320.214000 1917204.449800 5725753.986100 5796075.377400 1 Projected GCS_NZGD_2000 Linear Unit: Meter (1.000000) NZGD_2000_New_Zealand_Transverse_Mercator <ProjectedCoordinateSystem xsi:type='typens:ProjectedCoordinateSystem' xmlns:xsi='http://www.w3.org/2001/XMLSchema-instance' xmlns:xs='http://www.w3.org/2001/XMLSchema' xmlns:typens='http://www.esri.com/schemas/ArcGIS/10.8'><WKT>PROJCS["NZGD_2000_New_Zealand_Transverse_Mercator",GEOGCS["GCS_NZGD_2000",DATUM["D_NZGD_2000",SPHEROID["GRS_1980",6378137.0,298.257222101]],PRIMEM["Greenwich",0.0],UNIT["Degree",0.0174532925199433]],PROJECTION["Transverse_Mercator"],PARAMETER["False_Easting",1600000.0],PARAMETER["False_Northing",10000000.0],PARAMETER["Central_Meridian",173.0],PARAMETER["Scale_Factor",0.9996],PARAMETER["Latitude_Of_Origin",0.0],UNIT["Meter",1.0],AUTHORITY["EPSG",2193]]</WKT><XOrigin>-4020900</XOrigin><YOrigin>1900</YOrigin><XYScale>10000</XYScale><ZOrigin>0</ZOrigin><ZScale>1</ZScale><MOrigin>0</MOrigin><MScale>1</MScale><XYTolerance>0.001</XYTolerance><ZTolerance>0.001</ZTolerance><MTolerance>0.001</MTolerance><HighPrecision>true</HighPrecision><WKID>2193</WKID><LatestWKID>2193</LatestWKID></ProjectedCoordinateSystem> 5000000 50000 1.0 ItemDescription ISO 19139 Metadata Implementation Specification ESRI ArcCatalog 9.3.1.3500 en Landslide susceptibility is assessed on the basis of a model that includes slope from the LINZ 20 m elevation data and rock/soil information from the best geological maps avaiable. This method provides an indication of the susceptibility to moderate and large landslides. Susceptibility to smaller landslides such as those that could result from excavations undertaken in subdivision development are only possible when more detailed elevation data is available. No geotechnical or subsurface data are used in making the susceptibility classification. The landslide susceptibility dataset is intended as a guide to the susceptibility of an area to large landslides and does not replace the need for a site inspection for individual properties. GNS Science 2004 landslide_susceptibility landslide_susceptibility vector digital data withheld The dataset is being updated as new and or better scale geological mapping becomes available. Irregular. 175.973328 176.640798 -37.928981 -38.580318 2771479.085600 2827329.085600 6287310.528805 6357580.528805 The data has been obtained from a variety of sources. No person or organisation involved in the creation or supply of the data gives any warranties, representations or guarantees in relation to the data including that the data will be accurate, complete, free of errors, omissions and defects, up-to-date, not misleading or fit for any purpose. Must not be passed to any third party. Shapefile Version 6.2 (Build 9200) ; Esri ArcGIS 10.8.0.12790 LandslideSusceptibility 2771479.0856 2827329.0856 6357580.528805 6287310.528805 1 175.973869 176.640230 -37.927579 -38.578266 1 175.973328 176.640798 -37.928981 -38.580318 1 GNS Science (GNS) has been commissioned by Rotorua District Council (RDC) to describe landslide hazards within the Rotorua district <DIV STYLE="text-align:Left;"><DIV>EXECUTIVE SUMMARY GNS Science (GNS) has been commissioned by Rotorua District Council (RDC) to describe landslide hazards within the Rotorua district. The project has assessed landslides throughout the district in order to differentiate areas where the landslide hazard is similar. The report and accompanying map explain and show the variation in relative landslide susceptibility throughout the district. This information will help RDC develop policies and rules for dealing with landslide hazards in the new district plan. The landslide susceptibility map prepared using the methodology outlined in this report is in good agreement with the known landslide information in the Rotorua district. The agreement between the susceptibility model and historical landslide data provides confidence that the relative landslide susceptibility displayed on the map effectively discriminates relative landslide hazard. Two rainfall events generated multiple landslides over a 14 year period between 1996 and 2010. Analysis of rainfall data indicates that 200 mm of rainfall in 24 hours is the threshold for causing multiple landslides. Given that the rainfall events were limited in their extent in the district and a threshold of 200 mm of rain in 24 hours (approximately a 1-in-20 year return period event based on HIRDS data), to have two multiple landslide generating rainstorms (greater than 20-year return period storms) in 14 years matches rainfall data (the rainfall and landslide datasets were collected independently). The landslide damage caused by the 2004 Rotoehu earthquake is equivalent to MM8 in the epicentral area around Lakes Rotoehu and Rotoma. The 1987 Edgecumbe earthquake caused landslide damage equivalent to MM6 in the same area. In Rotorua City MM8 intensity has a return period of about 2500 years but for areas east of the city MM8 has a return period of 500 years. Thus the landslide distribution in the epicentral area of the Rotoehu earthquake is an analog for the type of landslide damage that might be expected during MM8 shaking in Rotorua city, which is expected to occur an average once every 2500 years. Large pre-existing landslides have been searched for by systematically examining vertical aerial photographs. No pre-existing large landslides have been identified in the Rotorua district. Based on the lack of evidence for large landslides in these terrains nationally, there is no large, pre-existing landslide hazard in the Rotorua district. First-time landslides not triggered by high-intensity rainfall or earthquake-shaking occur occasionally. Some of these occur in association with rainfall but there are often other contributing factors such as recent slope modification. GNS Science Consultancy Report 2010/82</DIV></DIV> Landslide en FGDC Content Standards for Digital Geospatial Metadata FGDC-STD-001-1998 local time David Heron GNS Science PO Box 30368 Lower Hutt 04 5704610 20100819 dataset Downloadable Data 233.615 233.615 002 withheld Local Area Network 233.615 Shapefile Feature Class Vector Simple FALSE 466622 TRUE FALSE GCS_New_Zealand_1949 GD_1949_New_Zealand_Map_Grid coordinate pair meters 0.000000 0.000000 D_New_Zealand_1949 International_1924 6378388.000000 297.000000 GD_1949_New_Zealand_Map_Grid EPSG 7.9.4(9.0.0) 466622 LandslideSusceptibility Feature Class 466622 OBJECTID OBJECTID OID 4 10 0 Internal feature number. Esri Sequential unique whole numbers that are automatically generated. Shape Shape Geometry 4 0 0 Feature geometry. ESRI Coordinates defining the features. VALUE VALUE: Integer code for landslide susceptibility deteremined from slope and rock/soil description (valid values are 1, 2, 3, 4, 5) SmallInteger 2 5 0 DESCRIPT DESCRIPTION of landslide susceptibility code (valid values are 'Very Low', 'Low', 'Moderate', 'High', 'Very High') String 10 0 0 Shape.STArea() Shape.STArea() Double 0 0 0 Shape.STLength() Shape.STLength() Double 0 0 0 20240724