Wellington Region High Detailed Streams

This dataset is one of several segments of a regional high detailed stream flowpath dataset. The data was separated using the TOPO 50 map series extents.The stream network was originally created for the purpose of high detailed work along rivers and streams in the Wellington region. It was started as a pilot study for the Mangatarere subcatchment of the Waiohine River for the Environmental Sciences department who was attempting to measure riparian vegetation. The data was sourced from a modelled stream network created using the 2013 LiDAR digital elevation model. Once the Mangatarere was complete the process was expanded to cover the entire region on an as needed basis for each whaitua. This dataset is one of several that shows the finished stream datasets for the Wairarapa region.The base stream network was created using a mixture of tools found in ArcGIS Spatial Analyst under Hydrology along with processes located in the Arc Hydro downloadable add-on for ArcGIS. The initial workflow for the data was based on the information derived from the help files provided at the Esri ArcGIS 10.1 online help files. The updated process uses the core Spatial Analyst tools to generate the streamlines while digital dams are corrected using the DEM Reconditioning tool provided by the Arc Hydro toolset. The whaitua were too large for processing separated into smaller units according to the subcatchments within it. In select cases like the Taueru subcatchment of the Ruamahanga these subcatchments need to be further defined to allow processing. The catchment boundaries available are not as precise as the LiDAR information which causes overland flows that are on edges of the catchments to become disjointed from each other and required manual correction.Attributes were added to the stream network using the  River Environment Classification (REC) stream network from NIWA. The Spatial Join tool in Arcmap was used to add the Reach ID to each segment of the generated flow path. This ID was used to join a table which had been created by intersecting stream names (generated from a point feature class available from LINZ) with the REC subcatchment dataset. Both of the REC datasets are available from NIWA's website.

Data and Resources

Additional Info

Field Value
Theme ["geospatial"]
Author Greater Wellington Regional Council
Maintainer GWRC_Admin
Source https://data-gwrc.opendata.arcgis.com/datasets/070deeb87ed04a239cd2c9bc61052898
Created 2017-02-20T19:51:32.000Z
Date modified 2019-09-16T01:49:12.000Z
Language English
Spatial {"type": "Polygon", "coordinates": [[[174.8842, -41.6209], [176.3762, -41.6209], [176.3762, -40.6474], [174.8842, -40.6474], [174.8842, -41.6209]]]}
Source Identifier https://data-gwrc.opendata.arcgis.com/datasets/070deeb87ed04a239cd2c9bc61052898
Record created November 2, 2020, Last Updated September 2, 2021