bc_eez_100m

Metadata:

• Identification_Information
• Data_Quality_Information
• Spatial_Data_Organization_Information
• Spatial_Reference_Information
• Entity_and_Attribute_Information
• Distribution_Information
• Metadata_Reference_Information

Identification_Information:

Citation:

Citation_Information:

Originator: Edward Gregr, SciTech Environmental Consulting

Publication_Date: February 1, 2012

Title: bc_eez_100m

Geospatial_Data_Presentation_Form: Fgdb raster digital data

Online_Linkage:

\\data-server\gis\BCMCA\Repository\external_data\BC_EEZ_bathy.gdb

Description:

Abstract:

A 100 m raster of the Canadian Pacific Exclusive Economic Zone (EEZ) created for research purposes. The raster provides depth information for the EEZ.

Purpose:

Research and analysis such as marine classification and the development of habitat suitability models. Qualitative assessment of positional accuracy suggests that significant errors exist, however the sources used are self-consistent, making these data suitable as a framework for coastwide, and possibly regional analyses. Regional analyses may benefit from minor shifts in this dataset to align with known control points.

Supplemental_Information:

***This bathymetry dataset has been provided to the BCMCA for distribution to those involved in marine planning work. A similar dataset was used in the BCMCA analyses.

Time_Period_of_Content:

Time_Period_Information:

Single_Date/Time:

Calendar_Date: 2012

Currentness_Reference: publication date

Status:

Progress: Complete

Maintenance_and_Update_Frequency: None planned

Spatial_Domain:

Bounding_Coordinates:

West_Bounding_Coordinate: -143.126555

East_Bounding_Coordinate: -117.330203

North_Bounding_Coordinate: 56.171882

South_Bounding_Coordinate: 45.199866

Keywords:

Theme:

Theme_Keyword_Thesaurus: Bathymetry

Theme_Keyword: Bathymetry

Theme_Keyword: DEM

Theme_Keyword: Digital Elevation Model

Place:

Place_Keyword: Pacific

Place_Keyword: Canada

Place_Keyword: British Columbia

Place_Keyword: Pacific Northwest

Stratum:

Stratum_Keyword: Bottom

Access_Constraints:

None. Data available on request from SciTech Environmental Consulting, Living Oceans Society, or the BCMCA website. Please credit SciTech and Living Oceans Society as the creators of the data in any maps, reports, or articles that are printed or published on paper or the Internet.

Use_Constraints:

Intended for scientific research only. SciTech is not responsible for damages resulting from any omissions or errors that may be contained in this dataset and expressly disclaims any warranty of fitness for any particular purpose. SciTech shall not be liable for any losses, financial or otherwise, due to the use of these data. The user assumes the entire risk as to the suitability, results and performance of the dataset for their proposed use.

Point_of_Contact:

Contact_Information:

Contact_Person_Primary:

Contact_Person: Edward Gregr

Contact_Organization: SciTech Environmental Consulting

Contact_Position: Principal

Contact_Voice_Telephone: 604-612-8324

Contact_Electronic_Mail_Address: ed@scitechconsulting.com

Data_Set_Credit:

Created by Edward Gegr, SciTech Environmental Consulting from Living Oceans Society, USGS, and COSEWIC source data.

Native_Data_Set_Environment:

Microsoft Windows XP Version 5.1 (Build 2600) Service Pack 2; ESRI ArcCatalog 9.3.1.3500

Cross_Reference:

Citation_Information:

Originator: Ralph A. Haugerud, USGS

Publication_Date: 1999

Title: USGS Cascadia bathymetry

Other_Citation_Details: 250 m bathymetry derived from a variety of sources.

Online_Linkage: <http://geopubs.wr.usgs.gov/open-file/of99-369>

Cross_Reference:

Citation_Information:

Originator: Living Oceans Society

Publication_Date: unpublished data

Title: Living Oceans Society Bathymetry

Other_Citation_Details: 100 m bathymetry derived from a variety of sources.

Cross_Reference:

Citation_Information:

Originator: Committee on the Status of Endangered Wildlife in Canada

Publication_Date: unpublished data

Title: COSEWIC EEZ

Other_Citation_Details:

Polygon of andiminstrative boundaries Canada_arc_gcs83.shp

Cross_Reference:

Citation_Information:

Originator: Canadian Hydrographic Service

Publication_Date: unpublished data

Title: CHS high water line

Other_Citation_Details: High water line derived from best available marine chart data.

Data_Quality_Information:

Attribute_Accuracy:

Attribute_Accuracy_Report:

Depths were recorded to nearest metre in source data. However, since the source data were derived from contours, depth accuracy will vary with the density of the contours, and likely decreases with increasing depth. Thus, an accuracy of +/- 10% is likely a reasonable assumption. In coastal areas, a depth of 1 m was arbitrarily used to replace areas incorrectly identified as land in the source data. Portions of these areas could quite deep, however as coastal areas are averaged over the 100m x 100m pixels, the mean pixel depth is unlikely to be > 10 m.

Logical_Consistency_Report:

Data become sparser with increasing depth likely leading to a loss of resolution at depth. Comparison between LOS and USGS data reveals a number of artifacts in both data sets likely due to interpolation errors from the source data. Additional comparison between the LOS data and a similar data sets derived by Natural Resources Canada (NRCan) from the same source data reveal a discrepancy of several hundred metres, likely due to interpolation methods.

Completeness_Report:

The raster is complete for the entire Pacific Canadian Exclusive Economic Zone, and considerably improves on the source data near the coastline.

Positional_Accuracy:

Horizontal_Positional_Accuracy:

Horizontal_Positional_Accuracy_Report:

Based on the comparison with the NRCan data, the horizontal referencing could be off by several hundred metres in places. Neither source data set aligned well with the best available coastline across the entire study area suggesting minor distortions in the projection of the original contour data. However, these data, and the source data sets are self-consistent, and thus provide a suitable framework for studies at coastwide extents. Regional analyses may benefit from minor shifts in this dataset to align with known control points.

Lineage:

Process_Step:

Process_Description:

Overview: This work was undertaken in response to the lack of a public domain bathymetry for the Canadian Pacific Exclusive Economic Zone (EEZ). While similar coverages have been created previously, they are not in the public domain.
The most comprehensive bathymetric data for the region comes from digital nautical charts developed by the Canadian Hydrographic Service (CHS). These data have been used to derive 2 existing bathymetric models for coastal BC: Natural Resources Canada (NRCan) produced a 75 m resolution raster in a NAD 1983 Lambert Conformal Conic projection. This raster includes only the spatial extents of the CHS charts, and no supplemental data. The Living Oceans Society (LOS) produced a 100 m resolution raster in BC Albers projection covering most of the EEZ except for a portion of the SE edge. The LOS bathymetry, developed in the 1990s, combined a number of data sets to augment the CHS data including the BC TRIM coastline and additional depths beyond the extents of the CHS nautical charts (source unknown). See the LOS metadata for more information.
A third raster produced by the US Geological Survey (USGS) at a resolution of 250 m in the Lambert Conformal Conic projection covers a large portion of the Canadian EEZ. This was used to complete the southern portion of the EEZ raster.
Visual inspection determined that all three data sets were missing considerable data in the near shore region (i.e., coastal marine areas were identified as land). Additionally, a random comparison of 5 spatially distinct marine features selected uniformly from across the EEZ study area determined that the LOS and NRCan bathymetries, despite being derived from the same source, were offset by at least 200 m.
Given that the LOS data were augmented with additional data, this was selected as the base data set for the 100 m EEZ raster. It was combined with the USGS raster to fill the SE portion, and a land mask, derived from the latest the latest CHS high water line (HWL), was used to delineate the coastline.
Process details:
1. Create land mask. 1a. The latest CHS HWL compiled from best available resolution marine charts was converted to polygons after cleaning up the edges. 1b. The HWL polygon was combined with an EEZ polygon from COSEWIC to create an Pacific Canadian EEZ marine polygon. 1c. The EEZ polygon was converted to a land mask with a 100 m resolution. The mask was snapped to the LOS bathymetry to avoid shifting the LOS data. 1d. The marine portion of the mask was assigned a depth of 1 m to capture coastal regions.
2. The LOS and USGS data were clipped to the Canadian EEZ.
3. All LOS and USGS non-depth values (i.e., elevations of 0 m or greater) were reclassified to NoData.
4. The three layers were mosaiced such that the LOS data were used first, and any NoData values were then filled first by the USGS data, and finally by the 1 m land mask.
5. The extents of the final raster were then reduced to the extents of the Pacific Canadian coast.

Source_Used_Citation_Abbreviation: LOS Bathymetry

Source_Used_Citation_Abbreviation: USGS Bathymetry

Process_Date: January 31 2012

Process_Time: 1200

Process_Contact:

Contact_Information:

Contact_Person_Primary:

Contact_Person: Edward Gregr

Contact_Organization: SciTech Environmental Consulting

Contact_Position: Principal

Contact_Voice_Telephone: 604-612-8324

Contact_Electronic_Mail_Address: ed@scitechconsulting.com

Process_Step:

Process_Description: Metadata imported.

Source_Used_Citation_Abbreviation:

C:\Data\SpaceData\Bathymetry\Pacific_EEZ\BC_EEZ_bathy_work.gdb\bc_eez_bathy.xml

Process_Date: 20120130

Process_Time: 08533000

Spatial_Data_Organization_Information:

Direct_Spatial_Reference_Method: Raster

Raster_Object_Information:

Raster_Object_Type: Pixel

Row_Count: 11145

Column_Count: 16226

Vertical_Count: 1

Spatial_Reference_Information:

Horizontal_Coordinate_System_Definition:

Planar:

Map_Projection:

Map_Projection_Name: Albers Conical Equal Area

Albers_Conical_Equal_Area:

Standard_Parallel: 50.000000

Standard_Parallel: 58.500000

Longitude_of_Central_Meridian: -126.000000

Latitude_of_Projection_Origin: 45.000000

False_Easting: 1000000.000000

False_Northing: 0.000000

Planar_Coordinate_Information:

Planar_Coordinate_Encoding_Method: row and column

Coordinate_Representation:

Abscissa_Resolution: 100.000000

Ordinate_Resolution: 100.000000

Planar_Distance_Units: meters

Geodetic_Model:

Horizontal_Datum_Name: North American Datum of 1983

Ellipsoid_Name: Geodetic Reference System 80

Semi-major_Axis: 6378137.000000

Denominator_of_Flattening_Ratio: 298.257222

Entity_and_Attribute_Information:

Detailed_Description:

Entity_Type:

Entity_Type_Label: VAT_bc_eez_100m

Attribute:

Attribute_Label: OBJECTID

Attribute_Definition: Internal feature number.

Attribute_Definition_Source: ESRI

Attribute_Domain_Values:

Unrepresentable_Domain:

Sequential unique whole numbers that are automatically generated.

Attribute:

Attribute_Label: VALUE

Attribute_Definition: Depth (m)

Attribute:

Attribute_Label: COUNT

Distribution_Information:

Resource_Description: Freely distributable data

Distribution_Liability:

The originators assume no liabilily whatsoever regarding the accurate distribution of the data set. It is placed in the public domain with the understanding that any user bears full liability for its appropriate use. Any distributors warrant that the data are distributed with the original metadata, and include metadata on any subsequent modifications.

Metadata_Reference_Information:

Metadata_Date: 20120417

Metadata_Contact:

Contact_Information:

Contact_Person_Primary:

Contact_Person: Edward Gregr

Contact_Organization: SciTech Environmental Consulting

Contact_Position: Principal

Contact_Address:

Address_Type: mailing and physical address

Address: 2136 Napier Street

City: Vancouver

State_or_Province: BC

Postal_Code: V5L2N9

Country: Canada

Contact_Voice_Telephone: 604-612-8324

Metadata_Standard_Name: FGDC Content Standards for Digital Geospatial Metadata

Metadata_Standard_Version: FGDC-STD-001-1998

Metadata_Time_Convention: local time

Metadata_Extensions:

Online_Linkage: <http://www.esri.com/metadata/esriprof80.html>

Profile_Name: ESRI Metadata Profile