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snippet: Summary This layer is a polygon-based zonal summary of erosion susceptibility indicators for 2 ha Digital River Network (DRN) watershed units across Northland. The symbology (erosion risk classes) of this layer is based on the attribute field “Erosion risk” which is informed by combination of two factors - “Geological risk” and “Sediment runoff risk” at 50:50 ratio.
summary: Summary This layer is a polygon-based zonal summary of erosion susceptibility indicators for 2 ha Digital River Network (DRN) watershed units across Northland. The symbology (erosion risk classes) of this layer is based on the attribute field “Erosion risk” which is informed by combination of two factors - “Geological risk” and “Sediment runoff risk” at 50:50 ratio.
accessInformation: Land & Water Science; NRC
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maxScale: 5000
typeKeywords: []
description: <DIV STYLE="text-align:Left;"><DIV><DIV><P STYLE="margin:0 0 0 0;"><SPAN><SPAN>This vector dataset represents a polygonised summary of terrain, hydrological, and regolith susceptibility inputs across DRN watersheds (at 2ha drainage thresholds). It contains zonal statistics derived from continuous raster and classed surfaces, which were used to evaluate spatial variation in erosion susceptibility at sub-catchment scale (DRN 2ha watersheds).</SPAN></SPAN></P><P /><P STYLE="margin:0 0 0 0;"><SPAN><SPAN>Key attributes include majority values from input rasters to S-PAL model (Sediment Process Attribute Layer) such as overland flow or “Sediment runoff risk”, regolith activity or “Geological risk”, hydrological susceptibility or “Soil permeability”, as well as slope and elevation, S-PAL siblings.</SPAN></SPAN></P><P /><P STYLE="margin:0 0 0 0;"><SPAN><SPAN>The symbology (erosion risk classes) of this layer is based on the attribute field “Erosion risk” which is informed by combination of two factors - “Geological risk” and “Sediment runoff risk” at 50:50 ratio.</SPAN></SPAN></P><P /><P STYLE="margin:0 0 0 0;"><SPAN><SPAN>For details see the Land &amp; Water Science report (Gunn and Rissmann 2025) - </SPAN></SPAN></P><P STYLE="margin:0 0 0 0;"><A href="https://www.nrc.govt.nz/media/tr4ng33g/northlands-landscape-driven-erosion-map-lws-2025.pdf" target="_blank" STYLE="text-decoration:underline;"><SPAN STYLE="text-decoration:underline;"><SPAN>Northland Erosion and Sediment Risk Map - Metadata Report LWS 2026.pdf</SPAN></SPAN></A></P><DIV STYLE="font-size:12pt"><P><SPAN /></P><P><SPAN /><SPAN /></P><P><SPAN STYLE="font-weight:bold;">Attribute field | </SPAN><SPAN>Field descriptions</SPAN><SPAN>Multiple fields, see below:</SPAN></P><P><SPAN STYLE="font-weight:bold;">Erosion Risk: </SPAN><SPAN STYLE="font-size:8pt">1-5 categories (where 1 = low risk, and 5 = high risk) from composite of two factors - inherent “Geological risk” and “Sediment runoff risk” at 50:50 ratio</SPAN><SPAN STYLE="font-weight:bold;font-size:8pt">Geological Risk</SPAN></P><P><SPAN>A70_O30_Quantile_Majority to A30_O70_Quantiles_Majority: Majority susceptibility class (1-5) from combined susceptibility layers (at various proportions of regolith and OLF susceptibility e.g. 70% regolith and 30% OLF), where 1 = low susceptibility, 2 = moderately low susceptibility, 3 = moderate susceptibility, 4 = moderately high susceptibility, and 5 = high susceptibility.</SPAN></P><P><SPAN STYLE="font-weight:bold;">Sibling_Class_Majority</SPAN><SPAN>: Majority class from SPAL_4_12_35 raster</SPAN></P><P><SPAN /></P><P><SPAN STYLE="font-weight:bold;">Author</SPAN><SPAN>: Dr Clint Rissmann (Land &amp; Water Science)</SPAN></P><P><SPAN /></P><P><SPAN STYLE="font-weight:bold;">Extent</SPAN><SPAN>: Whole Northland</SPAN></P><P><SPAN STYLE="font-weight:bold;">Projection</SPAN><SPAN>: NZTM (EPSG:2193)</SPAN></P><P><SPAN STYLE="font-weight:bold;">Coarsest Scale of Component Dataset</SPAN><SPAN>: 1:63,000 soil derived information</SPAN></P><P><SPAN STYLE="font-weight:bold;">Version</SPAN><SPAN>: Version 2.0</SPAN></P><P><SPAN /></P><P><SPAN STYLE="font-weight:bold;">Date Created</SPAN><SPAN>: July 2025</SPAN></P><P><SPAN STYLE="font-weight:bold;">Date Modified</SPAN><SPAN>: May 2026</SPAN></P><P><SPAN /></P><P><SPAN STYLE="font-weight:bold;">NRC Team </SPAN><SPAN>(if applicable): Natural Resources Science Team</SPAN></P><P><SPAN STYLE="font-weight:bold;">Subject Matter Expert</SPAN><SPAN>: Clint Rissmann – Landscape Scientist</SPAN></P><P><SPAN /></P><P><SPAN STYLE="font-weight:bold;">File Size</SPAN><SPAN>: 4.35 GB</SPAN></P><P><SPAN /></P><P><SPAN STYLE="font-weight:bold;">Data Provided by</SPAN><SPAN>: Manas Chakraborty (Resource Scientist - Freshwater)</SPAN></P></DIV></DIV></DIV></DIV>
licenseInfo: <DIV STYLE="text-align:Left;"><DIV><DIV><DIV STYLE="font-size:12pt"><P><SPAN>This dataset represents zonal summaries and is intended for catchment=scale interpretation. It should not be used for pixel-level or engineering-scale prediction. Zonal values reflect, majority, modal or mean behaviour and do not capture localised extremes within polygons.</SPAN></P><P><SPAN STYLE="font-weight:bold;">Licencing</SPAN></P><P><SPAN /><SPAN>This dataset was developed by Land &amp; Water Science under agreement with NRC. NRC is licensed to use the product, but Land &amp; Water Science retains intellectual property and full reuse rights.</SPAN></P></DIV></DIV></DIV></DIV>
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title: Northland’s Erosion and Sediment Risk map – catchment scale
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tags: ["NRC","Erosion Susceptibility","Regolith Activity","SPAL","OLF","Northland","Continuous Index","HEL"]
culture: en-US
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minScale: 20000000
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