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Distribution of kelp on the coast of British Columbia extracted from CHS source data: 1904 - 2004 Kelp features were taken from digitized survey source fieldsheets produced by the Canadian Hydrographic Service (CHS). The area covered by this dataset encompasses various surveyed areas along the western coast of North America in British Columbia coastal waters. CHS has an extensive collection of hydrographic survey data in the form of field sheets based on over 100 years of surveying in Canada. Data has been collected using a wide range of methods and systems, from lead-line to modern day multi-transducer and multibeam systems. Positions have been established using the different types of terrestrial systems and methods available over many years - up to the latest advanced satellite positioning systems. Fieldsheets that had not been previously digitizted were imported into ESRI ArcMap and georeferenced directly to WGS84 using CHS georeferencing standards and principles (charts.gc.ca). In order to minimize error, a hierarchy of control points was used, ranging from high survey order control points to comparing conspicuous stable rock features apparent in satellite imagery. The georeferencing result was further validated against satellite imagery, CHS charts and fieldsheets, the CHS-Pacific High Water Line (charts.gc.ca), and adjacent and overlapping Fieldsheets. Finally, the kelp features were digitized, and corresponding chart information (category of kelp, scale, source, title, year, and comments) was added as attributes to each feature. When digitizing kelp features the points were located at the optical center of the feature being digitized. This dataset includes a point and a polygon layer. Kelp that is located on land is historically valid. Symbolized kelp is not always an exact location but indicates that kelp is present in the area. The symbol is a proxy. The kelp attribute field does not distinguish between different types of kelp. The field has three variables that are kelp, seaweed and Aquatic Plants. Seaweed is the general name for marine plants of the Algae class which grow in long narrow ribbons. (International Maritime Dictionary, 2nd Ed.) Kelp is one of an order (laminariales) of usually large, blade-shaped or vine-like brown algae. (IHO Dictionary, S-32, 5th Edition, 2611) Aquatic Plants – Aquatic plants are used as to represent vegetation in fresh water rivers and lakes. Geographically encompasses the kelp in the Western Coastal waters of North America (mainly Canada) and Temporally overlaps/continues from data extracted from the British Admiralties. 2020-10-21 Fisheries and Oceans Canada CHSDataCentre.XPAC@dfo-mpo.gc.ca Form DescriptorsNature and EnvironmentScience and TechnologyAquatic plantsAquatic ecosystems Distribution of kelp on the coast of British Columbia extracted from CHS source data: 1904-2004SHP https://pacgis01.dfo-mpo.gc.ca/FGPPublic/BC_Kelp_Distribution/BC_kelp_distribution_from_CHS_Source_Data.zip Data DictionaryDOCX https://pacgis01.dfo-mpo.gc.ca/FGPPublic/BC_Kelp_Distribution/BC_kelp_distribution_from_CHS_Source_data-dictionary.docx Distribution of kelp on the coast of British Columbia extracted from CHS source data: 1904-2004ESRI REST https://gisp.dfo-mpo.gc.ca/arcgis/rest/services/FGP/Distribution_of_Kelp_on_the_Coast_of_British_Columbia_1904_2004/MapServer Historical distribution of kelp forests on the coast of British Columbia: 1858 - 1956ESRI REST https://gisp.dfo-mpo.gc.ca/arcgis/rest/services/FGP/Distribution_of_Kelp_on_the_Coast_of_British_Columbia_1904_2004/MapServer

Distribution of kelp on the coast of British Columbia extracted from CHS source data: 1904 - 2004

Kelp features were taken from digitized survey source fieldsheets produced by the Canadian Hydrographic Service (CHS). The area covered by this dataset encompasses various surveyed areas along the western coast of North America in British Columbia coastal waters. CHS has an extensive collection of hydrographic survey data in the form of field sheets based on over 100 years of surveying in Canada. Data has been collected using a wide range of methods and systems, from lead-line to modern day multi-transducer and multibeam systems. Positions have been established using the different types of terrestrial systems and methods available over many years - up to the latest advanced satellite positioning systems.

Fieldsheets that had not been previously digitizted were imported into ESRI ArcMap and georeferenced directly to WGS84 using CHS georeferencing standards and principles (charts.gc.ca). In order to minimize error, a hierarchy of control points was used, ranging from high survey order control points to comparing conspicuous stable rock features apparent in satellite imagery. The georeferencing result was further validated against satellite imagery, CHS charts and fieldsheets, the CHS-Pacific High Water Line (charts.gc.ca), and adjacent and overlapping Fieldsheets. Finally, the kelp features were digitized, and corresponding chart information (category of kelp, scale, source, title, year, and comments) was added as attributes to each feature. When digitizing kelp features the points were located at the optical center of the feature being digitized. This dataset includes a point and a polygon layer. Kelp that is located on land is historically valid.

Symbolized kelp is not always an exact location but indicates that kelp is present in the area. The symbol is a proxy.

The kelp attribute field does not distinguish between different types of kelp. The field has three variables that are kelp, seaweed and Aquatic Plants. Seaweed is the general name for marine plants of the Algae class which grow in long narrow ribbons. (International Maritime Dictionary, 2nd Ed.)

Kelp is one of an order (laminariales) of usually large, blade-shaped or vine-like brown algae. (IHO Dictionary, S-32, 5th Edition, 2611)

Aquatic Plants – Aquatic plants are used as to represent vegetation in fresh water rivers and lakes.

Geographically encompasses the kelp in the Western Coastal waters of North America (mainly Canada) and Temporally overlaps/continues from data extracted from the British Admiralties.

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Resources

Resource Name Resource Type Format Language Links
Distribution of kelp on the coast of British Columbia extracted from CHS source data: 1904-2004 Dataset SHP English
French
Access
Data Dictionary Guide DOCX English
French
Access
Distribution of kelp on the coast of British Columbia extracted from CHS source data: 1904-2004 Web Service ESRI REST English Access
Historical distribution of kelp forests on the coast of British Columbia: 1858 - 1956 Web Service ESRI REST French Access

Geographic Information

Spatial Feature

Contact Information

Delivery Point: PO Box 6000 9860 W Saanich Rd

City: Sidney

Administrative Area: British Columbia

Postal Code: V8L4B2

Country: Canada

Electronic Mail Address: CHSDataCentre.XPAC@dfo-mpo.gc.ca

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