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Description: <DIV STYLE="text-align:Left;"><DIV><DIV><P><SPAN><SPAN>Areas of High Erosion Risk (AHER) Greater Kaipara Harbour Catchment is an NRC created shapefile that combines attributes supplied in the </SPAN></SPAN><SPAN STYLE="font-weight:bold;"><SPAN>New Zealand Land Resource Inventory</SPAN></SPAN><SPAN /><SPAN /><SPAN STYLE="font-weight:bold;"><SPAN>(NZLRI),</SPAN></SPAN><SPAN /><SPAN>namely the </SPAN><SPAN STYLE="font-weight:bold;"><SPAN>land use Capability</SPAN></SPAN><SPAN /><SPAN /><SPAN STYLE="font-weight:bold;">(LUC)</SPAN><SPAN /><SPAN>component, which is a rating of the ability of each polygon to sustain agricultural production, based on an assessment of the inventory factors above, climate, the effects of past land use, and the potential for erosion. </SPAN></P><P /><UL STYLE="margin:0 0 0 0;padding:0 0 0 0;"><LI><P STYLE="font-weight:bold;"><SPAN><SPAN>LUC values selected range from “6 e1” – “7 e9”.</SPAN></SPAN></P></LI><LI><P><SPAN><SPAN>Also, slope attributes were targeted which are identified in the NZLRI </SPAN></SPAN><SPAN STYLE="font-weight:bold;">(‘D slopes - ‘G’ Slopes</SPAN><SPAN STYLE="font-weight:bold;">)</SPAN><SPAN>.</SPAN></P></LI></UL><P /><P><SPAN><SPAN>The second component to this data is The New Zealand </SPAN></SPAN><SPAN STYLE="font-weight:bold;">Land cover data base (LCDB3/4)</SPAN><SPAN /><SPAN>The Land Cover Database (LCDB3/4) is a multi-temporal digital thematic map of land cover and land use. Land cover information contains snapshots at each of four periods; summer 1996/97, summer 2001/02, summer 2008/09, and summer 20012/13</SPAN></P><P /><UL STYLE="margin:0 0 0 0;padding:0 0 0 0;"><LI><P><SPAN><SPAN>LCDB3/4 was used to select areas of </SPAN></SPAN><SPAN STYLE="font-weight:bold;"><SPAN>non-forest</SPAN></SPAN><SPAN /><SPAN>(I.e. “High, Low Producing Exotic Grassland”, “Gorse and Broom”, “Short rotation Cropland”) analysis.</SPAN></P></LI></UL><UL STYLE="margin:0 0 0 0;padding:0 0 0 0;"><LI><P><SPAN><SPAN>Created to identify areas to be targeted as a part of MPI funded Greater Kaipara Harbour Catchment Hill Country Erosion project</SPAN></SPAN></P></LI></UL><P><SPAN>Data is designed for in-house use 1:50,000 scale.</SPAN></P></DIV></DIV></DIV>
Service Item Id: 790e347f48dd458aa0e4fe5bb1c52d82
Copyright Text: Land Care NZ for NZRLI and for Land Cover Data Base produced by land care for the Ministry for the Environment (MfE).
Description: <DIV STYLE="text-align:Left;"><DIV><DIV><P><SPAN><SPAN>National Environmental Standards for Plantation Forestry - Erosion Susceptibility Classification and Fish Spawning Indicator Databases and Metadata. </SPAN></SPAN></P><P><SPAN><SPAN>If you are uploading the layers into your own GIS system, please ensure all three Fish Spawning Indicator layers are uploaded (NZFFD, Non-Migratory and modelled probability) along with the current ESC version layer.</SPAN></SPAN></P><P><SPAN><SPAN>This tool was developed for use in the context of the National Environmental Standards for Plantation Forestry (NES-PF). The tool supports councils and foresters in decisions on the level of risk associated with the NES-PF. Its successful application elsewhere cannot be guaranteed.</SPAN></SPAN></P><P><SPAN /></P></DIV></DIV></DIV>
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 < 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>
Service Item Id: 790e347f48dd458aa0e4fe5bb1c52d82
Copyright Text: Manaaki Whenua Landcare Research, Northland Regional Council
Description: SedNetNZ is a spatially distributed, time-averaged model based on relatively simple physical representation of hillslope and erosion processes. This layer only represents sediment delivery by the four hillslope erosion processes landslides, surficial erosion, earthflows and gullies in t/sqkm/yr.Input datasets are erosion terrains (See Dymond, Betts and Schierlitz 2010), slope, LCDB and mean annual rainfall.The dataset is intended to be used for planning purposes such as prioritisation of farm plans.Version 1.0 30/09/2015
Service Item Id: 790e347f48dd458aa0e4fe5bb1c52d82
Copyright Text: SedNetNZ was developed by Landcare Research under the lead of John Dymond.
Contact Markus Mueller, Private Bag 3127, Waikato Mail Centre, Hamilton 3240. Phone +64 859 3720.
Description: Highly erodible land is defined as land at risk to severe mass-movement erosion (land slide earth flow and gully) if it does not have protective woody vegetation. To be at risk to land slide erosion a slope threshold must be exceeded. If the land has protective woody vegetation (i.e. indigenous forest exotic forest or scrub) then it is considered not at risk to severe land slide erosion nor to earthflow or gully erosion. The algorithm used to define classes of highly erodible land is as follows: 1. A slope threshold was defined for each erosion terrain (Table 3). These thresholds were obtained from published field measurements where available. 2. All pixels in a 15-m pixel DEM above the threshold defined by the pixel's erosion terrain were assigned to "high land slide risk”. 3. The pixel-based map was converted to a hillslope basis by using an aspect-based filterwitha25% risk rule(2-ha minimum mapping unit). 4. All "high landslide risk”pixels were examined to see if they could deliver sediment to a water course or not. Land was considered capable of delivering sediment if it was possible to traverse down DEM streamlines until a watercourse was reached without encountering two consecutive pixels of low slope(i.e. 5degrees). If "high land slide risk”can deliver sediment to a water course then it is labelled as "high landslide risk delivery to stream”. Otherwise it is labelled as "high landslide risk -non-delivery to stream”. 5. All pixels in moderate earth flow land were assigned to "moderate earth flow risk”. 6. All pixels in severe earth flow land were assigned to "severe earth flow risk”. 7. All pixels in gully land were assigned to "gully risk”. 8. All highly erodible land was examined to see if it had protective woody vegetation on it according to the EcoSat woody layer ( 2001). If it did then land was labelled as "woody vegetation”. In other words land is not highly erodible when there is protective woody vegetation. This algorithm produces 5 classes of highly erodible land: 1. High land slide risk –delivery to stream 2. High land slide risk - non-delivery to stream 3. Moderate earth flow risk 4. Severe earth flow risk 5. Gully risk
Service Item Id: 790e347f48dd458aa0e4fe5bb1c52d82
Copyright Text: Landcare Research Contract report: LC0708/094, 2008
Description: The Land Use Map is composed of New Zealand-wide land use classifications (12) nominally at 1 January 1990, 1 January 2008, 31 December 2012 and 31 December 2016 (known as "1990", "2008", "2012" and "2016"). These date boundaries were dictated by the First and Second Commitment Periods of the Kyoto Protocol. The layer can therefore be used to create either a 1990, 2008, 2012 or 2016 land use map depending on what field is symbolised.
Service Item Id: 790e347f48dd458aa0e4fe5bb1c52d82
Copyright Text: Manaaki Whenua - Landcare Research
Description: <DIV STYLE="text-align:Left;"><DIV><DIV><P><SPAN>Queen Elizabeth II National Trust</SPAN><SPAN /><SPAN>(Ng</SPAN><SPAN><SPAN>ā Kairauhī</SPAN></SPAN><SPAN /><SPAN>Papa)</SPAN><SPAN /><SPAN>is an independent statutory organisation and a registered charity. It was set up in 1977 to 'encourage and promote, for the benefit of New Zealand, the provision, protection, preservation and enhancement of open space'.</SPAN><SPAN /><SPAN>Open Space (as described in the Queen Elizabeth II National Trust Act 1977) means any area of land or body of water that serves to preserve or to facilitate the preservation of any landscape of aesthetic, cultural, recreational, scenic, scientific or social interest or value.</SPAN><SPAN /><SPAN>QEII National Trust's core objective is to secure long-term protection of natural and cultural features on private land with covenants. The Trust acts </SPAN><SPAN /><SPAN>as the perpetual trustee to ensure the covenant remains protected forever.This dataset shows the extent of digitised registered and formalised QEII National Trust Covenants thoughout New Zealand </SPAN><SPAN /><SPAN>as at </SPAN><SPAN>22 June </SPAN><SPAN>2</SPAN><SPAN /><SPAN>02</SPAN><SPAN>1</SPAN><SPAN /><SPAN>(</SPAN><SPAN>4,</SPAN><SPAN>8</SPAN><SPAN>78</SPAN><SPAN /><SPAN>registered and formalised covenants with polygons). The quality of the data has been assessed by comparing the registered area of each covenant (in hectares) with the geometric area as calculated in the GIS. Currently 9</SPAN><SPAN>6.</SPAN><SPAN>2</SPAN><SPAN>% of the polygons are within +/- 10% of the registered area (QualCode = 1). The remaining 3.</SPAN><SPAN>8</SPAN><SPAN>% have to be verified and either require re-digitising or some further amendment. We are working our way through these to improve the quality. </SPAN><SPAN>5</SPAN><SPAN>0</SPAN><SPAN>7 </SPAN><SPAN>polygons have not yet been verified against a survey plan or photodiagram. Please note that the quality code described above is no reflection of the positional accuracy. </SPAN><SPAN /><SPAN>Each year, approximately </SPAN><SPAN>11</SPAN><SPAN>0 new covenants are approved by the QEII Board, but each may take, on average, two years to complete the process to registration. In addition, there are a number of changes to existing covenants as a result of sub-divisions, changes of ownership, variations and so on.</SPAN></P></DIV></DIV></DIV>
Service Item Id: 790e347f48dd458aa0e4fe5bb1c52d82
Copyright Text: The digital layer of QEII National Trust covenant boundaries has been compiled from various sources around the country, including regional and district councils, DOC conservancies, surveyors and LandOnline. Funding from TFBIS in 2005 enabled QEII to sub-contract the digital capture of covenant boundaries from survey plans for the remaining parts of the country. Since 2005, new covenant boundaries are supplied directly to QEII by the surveyors who produce the survey plans or are downloaded from LandOnline.