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nrc.GISADMIN.Northland_High_Sediment_Yield_Land
002
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Linear Unit: Meter (1.000000)
NZGD_2000_New_Zealand_Transverse_Mercator
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Esri ArcGIS 12.6.3.24783
Northland High Sediment Yield Land
Sediment is a significant fresh and coastal water quality issue in Northland. The purpose of the data/layer is to identify areas in Northland that have high erosion potential and to inform council’s policy and soil conservation programmes. It can also be used to inform landowners and the public generally about erosion and soil conservation issues in Northland and in particular to assist in implementation of the National Policy Statement for Freshwater Management.
<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 < 120, 120 -250, 250 – 500 and >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 >250</SPAN></P><P><SPAN>7. Clip Pasture layer to >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 < 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>
Manaaki Whenua Landcare Research, Northland Regional Council
High Sediment Yield Land
Erosion
erodible land
hillslope
NRC
Northland Regional Council
Sediment
Sediment Yield
Northland High Sediment Yield Land
<DIV STYLE="text-align:Left;"><DIV><DIV><P><SPAN>Indicative ONLY</SPAN></P></DIV></DIV></DIV>
Enterprise Geodatabase Feature Class
dataset
EPSG
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Simple
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nrc.GISADMIN.Northland_High_Sediment_Yield_Land
Feature Class
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OBJECTID
OBJECTID
OID
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10
0
Internal feature number.
Esri
Sequential unique whole numbers that are automatically generated.
Shape
Shape
Geometry
8
0
0
Feature geometry.
Esri
Coordinates defining the features.
Name_2012
LCDB41_2012
String
1073741822
0
0
Threshold
THRESHOLD
String
255
0
0
Shape.STArea()
Shape.STArea()
Double
0
0
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Shape.STLength()
Shape.STLength()
Double
0
0
0
20210114