 - Seine0.bmp)
Data format: File Geodatabase Feature Class
File or table name: Fish2006Seine
Coordinate system: New_Zealand_Map_Grid
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Data format: File Geodatabase Feature Class File or table name: Fish2006Seine Coordinate system: New_Zealand_Map_Grid |
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Abstract:
This dataset contains fish species found at 12 different seine points during 2006. For each species found, its name, total counts, size in length and density (count per 1000m2) is given. The point is just an x,y coordinate on or near the beach. The actual seine area is bigger as the net was cast outwards to sea/water from that x,y point.This fish data is being gathered by NIWA on an on-going study commissioned by the Christchurch City Council since 2005. The data available now is for 2005 and 2006, with 2007 currently being processed by NIWA. Data was gathered through two main methods: Seine (beach sites) and Trawl (through the main channels). Seine sites were provided in a geographic point shapefile and trawl lines in a polygon shapefile, and the actual fish data in tables. The geographical sites were then mapped to their tabular data based on the site id and four data layers created. Each layer represents a method for each year. Layers are named to reflect this breakdown: Fish2005seine.shp, Fish2005Trawl.shp, Fish2006Seine.shp, Fish2006Trawl.shp. A record is unique in each layer through the combination of fish species and site identifier. |
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Metadata elements shown with blue text are defined in the Federal Geographic Data Committee's (FGDC) Content Standard for Digital Geospatial Metadata (CSDGM). Elements shown with green text are defined in the ESRI Profile of the CSDGM. Elements shown with a green asterisk (*) will be automatically updated by ArcCatalog. ArcCatalog adds hints indicating which FGDC elements are mandatory; these are shown with gray text.
This dataset contains fish species found at 12 different seine points during 2006. For each species found, its name, total counts, size in length and density (count per 1000m2) is given. The point is just an x,y coordinate on or near the beach. The actual seine area is bigger as the net was cast outwards to sea/water from that x,y point.This fish data is being gathered by NIWA on an on-going study commissioned by the Christchurch City Council since 2005. The data available now is for 2005 and 2006, with 2007 currently being processed by NIWA. Data was gathered through two main methods: Seine (beach sites) and Trawl (through the main channels). Seine sites were provided in a geographic point shapefile and trawl lines in a polygon shapefile, and the actual fish data in tables. The geographical sites were then mapped to their tabular data based on the site id and four data layers created. Each layer represents a method for each year. Layers are named to reflect this breakdown: Fish2005seine.shp, Fish2005Trawl.shp, Fish2006Seine.shp, Fish2006Trawl.shp. A record is unique in each layer through the combination of fish species and site identifier.
This dataset was created for the Avon-Heathcote Estuary Ihutai Trust for display on their website. One of the Trust's aim is to disseminate as much information on the estuary to the public and to the scientific research community.
Merging of the point files to the table was easily achieved as that required the transfer of the sites x,y coordinates into the table to create the geographic link. There is no such coordinates with an area, especially irregular ones like the trawling channels, so merging here was more complicated. This was achieved by copying the actual geographic trawl shape (row/record) of each trawling area and pasted repeatedly to reflect the number of different fish species found in that channel. This was do-able only because the number of fish species concerned was twenty two. To illustrate, for example in Trawl2005.shp, the avon channel had seven different fish species caught so the original avon channel shape got copied six more times, and each fish species (row from the fish table) linked up to this geographic shape by using the same site_ids appearing in both files.
Alternate contact: Ryan Elley, ECAN
Data collected, prepared and digitised by Julian Sykes and Gavin James, NIWA. Extra processing (data merges) done by Geua Boe-Gibson, Envvironment Canterbury.
Dataset copied.
Feature geometry.
ESRI
Internal feature number.
ESRI