Name: Erosion and sediment risk - property scale

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Type: Raster Layer

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Description: This raster represents a continuous composite susceptibility surface based on two SPAL indicators: MADZ-derived regolith activity (i.e. landscape structural instability indicating geological risk) and the OLF (indicating sediment runoff) index. Equal weighting was applied to both inputs:Composite Score = 0.5 × Activity + 0.5 × OLFThe resulting surface was scaled from approximately 1.32 to 4.95 (higher values = higher susceptibility), yielding a continuous measure of erosion susceptibility across the landscape. This supports prioritisation and interpretation at fine spatial resolution.For details see the Land & Water Science report (Gunn and Rissmann 2025) - Northland’s Landscape Driven Erosion Map: A Resource for Decision-Makers and CommunitiesAuthor: Dr Clint Rissmann (Land & Water Science)Extent: Whole NorthlandProjection: NZTM (EPSG:2193)Coarsest Scale of Component Dataset: 1:63,000 resampled to 5mVersion: Version 2.0Date Created: July 2025Date Modified: N/ANRC Team (if applicable): Natural Resources Science TeamSubject Matter Expert: Clint Rissmann – Landscape ScientistFile Size: 1.91 GBRaster Metadata Summary:CRS: NZGD2000 / New Zealand Transverse Mercator (EPSG:2193)Pixel Size: 5 m × 5 mRaster Dimensions: 35,661 (width) × 44,551 (height)Extent: 1567222.5000, 5971572.5000 to 1745527.5000, 6194327.5000GDAL Driver: GTiff (GeoTIFF)Compression: LZWStatistics: Min = 1.3167, Max = 4.9504, Mean = 4.0059, StdDev = 0.1441Valid Data Coverage: 31.27%Data Provided By: Manas Chakraborty (Freshwater Resource Scientist)Data Published By: Bhawana Kafle (Geospatial Analyst)Published Date: 19/02/2026Last Updated By: Jordon Corston (Geospatial Analyst)Last Update Date: 19/05/2026

Service Item Id: 6d86e27a506849e09ded0b952e67faff

Copyright Text: Land & Water Science; NRC

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YMin: 5971572.5
XMax: 1745527.5
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Spatial Reference: 2193  (2193)  LatestVCSWkid(0)

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