Name: Northland High Sediment Yield Land

Display Field: Name_2012

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Description: <DIV STYLE="text-align:Left;"><DIV><DIV><P><SPAN>Derived from Landcare Hillslope Erosion SedNet Model, by identifying areas greater than 250 t/sqkm/y over Pasture and Woody Vegetation with areas under 2ha excluded.</SPAN></P><P><SPAN>Methodology:</SPAN></P><P><SPAN>1. Convert Landcare SEDNET Hillslope Erosion layer from Raster to Vector.</SPAN></P><P><SPAN>2. Classify Landcare SEDNET Hillslope Erosion vector layer into 4 classes: pixel values &lt; 120, 120 -250, 250 – 500 and &gt;500 t/sqkm/y</SPAN></P><P><SPAN>3. Create Pasture and woody veg layers from LCDB4.1</SPAN></P><P><SPAN>4. Pasture Landcover classes: High Producing Exotic Grassland, Low Producing Grassland, Depleted Grassland.</SPAN></P><P><SPAN>5. Woody Vegetation Landcover classes: Forest – Harvested, Deciduous Hardwoods, Indigenous Forest, Exotic Forest.</SPAN></P><P><SPAN>6. Clip Woody vegetation layer to &gt;250</SPAN></P><P><SPAN>7. Clip Pasture layer to &gt;250</SPAN></P><P><SPAN>8. Buffer each layer by 1cm to dissolve boundaries where smaller polygons are a part of larger polygons</SPAN></P><P><SPAN>9. Merge to create one layer containing Pasture and Woody Vegetation</SPAN></P><P><SPAN>10. Exclude areas &lt; 2ha</SPAN></P><P><SPAN>Attribution Includes -</SPAN></P><P><SPAN>LCDB41_2012: Name of the Land cover type, classified by the New Zealand Landcover Database summer 2012/13</SPAN></P><P><SPAN>THRESHOLD: The threshold of the High Sediment Yielding Land to be targeted, areas over 250 ton per square kilometer per year.</SPAN></P><P><SPAN>This data is for information purposes. There are no significant limitations on its use but it should be recognised that it is based on modelled estimates of erosion and is therefore indicative rather than actual.</SPAN></P><P><SPAN>Extent: Northland Region</SPAN></P><P><SPAN>Scale Range: 1:5,000,000 - 1:5000</SPAN></P><P><SPAN>Version: 0.1</SPAN></P><P><SPAN>Date Created: December 2020</SPAN></P></DIV></DIV></DIV>

Service Item Id: 790e347f48dd458aa0e4fe5bb1c52d82

Copyright Text: Manaaki Whenua Landcare Research, Northland Regional Council

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• OBJECTID ( type: esriFieldTypeOID, alias: OBJECTID )
• Name_2012 ( type: esriFieldTypeString, alias: LCDB41_2012, length: 1073741822 )
• Threshold ( type: esriFieldTypeString, alias: THRESHOLD, length: 255 )
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