Date (Publication)

2008-12-01

Code

https://doi.org/10.48689/AF6F50E9-62D3-4824-BE87-C96100817D45

Cited responsible party

Organisation name	Individual name	Electronic mail address	Role
Department of Fisheries and Oceans, Pacific Biological Station			Processor

Purpose

The purpose of this dataset is to identify areal extents of Lithothrix aspergillum (red algae) presence that helps inform the marine feature identified at the BCMCA Marine Plants Workshop.

The British Columbia Marine Conservation Analysis (BCMCA) is a collaborative project assembling and analyzing spatial information about Canada's Pacific Ocean. The overall goal of the BCMCA is to identify marine areas of high conservation value and marine areas important to human use. Results of the project are intended to inform and help advance marine planning initiatives in BC by providing collaborative, peer-reviewed scientific analyses based on the best ecological and socio-economic spatial data at scales relevant to a BC coast-wide analysis.

Status

Under development

Point of contact

Organisation name	Individual name	Electronic mail address	Role
BCMCA	Karin Bodtker		Point of contact

Maintenance and update frequency

Unknown

Global Change Master Directory (GCMD) Science Keywords v15.9

• EARTH SCIENCE > Biological Classification > Plants > Macroalgae (seaweeds)

DFO Areas

• British Columbia

Access constraints

Other restrictions

Use constraints

License

Other constraints

Access to data product after license:

This dataset is subject to the terms and conditions of the data use agreements for the source datasets.

Other constraints

This dataset is subject to the terms and conditions of the data use agreements for the source datasets.

Spatial representation type

Vector

Language

eng

Topic category

• Biota

Environment description

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

Supplemental Information

This dataset is a compilation of data collected by many people, for different purposes, using different survey techniques with different methodologies within each technique and, therefore, considerable care must be taken when using the data, even for site-specific inquiries. Refer to the original metadata document for data limitations and usage. Title or link is provided within source information. Data was collected and merged by target feature layer using the following data sources:

1. UBC Herbarium (Algae Export.XLS). Identifies various algae species observations.

Reference system identifier

https://spatialreference.org/ref/epsg/ / EPSG:4326 / 8.3

EPSG spatial reference code 2007-08-27 OGP Geomatics Committee Geomatics Discipline Lead Denmark lks@iogp.org

Topology level

001

Geometric object type

Composite

Geometric object count

6

Geometric object type

Point

Geometric object count

39346

Geometric object type

Composite

Geometric object count

39346

Geometric object type

Point

Geometric object count

4

Distribution format

Name	Version
ESRI Shapefile	1.2

Distributor contact

Organisation name	Individual name	Electronic mail address	Role
British Columbia Marine Conservation Analysis			Distributor

OnLine resource

Protocol	Linkage	Name
WWW:LINK-1.0-http--link	https://bcmca.ca/data/eco_algae_rarespecies5_lithothrix_aspergillum/	Rare Algae Series 5 – Lithothrix aspergillum
WWW:DOWNLOAD-1.0-http--download	https://soggy.zoology.ubc.ca/geonetwork/srv/api/records/AF6F50E9-62D3-4824-BE87-C96100817D45/attachments/Algae_Lithothrix_aspergillum.zip	Algae_Lithothrix_aspergillum.zip
WWW:DOWNLOAD-1.0-http--download	https://soggy.zoology.ubc.ca/geonetwork/srv/api/records/AF6F50E9-62D3-4824-BE87-C96100817D45/attachments/Algae_Lithothrix_aspergillum.pdf	Algae_Lithothrix_aspergillum.pdf
OGC:WMS-1.1.1-http-get-map	https://soggy.zoology.ubc.ca/geoserver/wms?service=WMS&	bcmca:algae_lithothrix_aspergillum

OnLine resource

Protocol	Linkage	Name
DOI	https://doi.org/10.48689/AF6F50E9-62D3-4824-BE87-C96100817D45	Digital Object Identifier (DOI)

Hierarchy level

Dataset

Description

The methods used to combine datasets to identify areal extents of Lithothrix presence are as follows

Date / Time

2008-10-24T15:05:35

Description

--> To prepare UBC dataset:

Converted UBC Algae Export.xls table into dbase format so that the XY coordinates stored in the records could be plotted spatially and exported as point feature classes.

In the Algae Export excel sheet, majority of the coordinates had been converted to decimal degrees in two unnamed columns that were formatted to "scientific" and were displayed in scientific notation. This column was changed to "number" format to two decimal places. Two new columns were created to store decimal degrees: "LatDD" and "LongDD".

For the coordinates not previously converted into decimal degrees: converted using an excel conversion formula (can be found in many formats online). The longitude and latitude columns have the original DM/DMS coordinates.

Description

Formatted excel spreadsheets for conversion to DBF format. Created new columns in all three worksheets, labeled "LatDD" and "LongDD" to store decimal degrees. Columns without headings or information were removed. Below is a summary of columns removed:

From the Postelsia worksheet:

Det. Date, Subsp., Subspauth, Var., Varauth.

From the Pterygophora worksheet:

Subsp, Subspauth, Var., Varauth., Det. Date

From the Others worksheet:

Subsp., Subspauth, Var., Varauth.

Saved excel worksheets as dbase version 4. The saved dbf tables were reviewed to ensure they contained the same amount of records as original excel worksheets, and the decimal degree coordinates were tested against the shoreline trim to ensure the points were in the correct locations around vancouver island. A number of records did not have coordinates and showed up at 0 lat, 0 long. These were deleted during processing.

Description

All records were plotted and displayed in Arcmap using display XY data tool:

Added the DBF table to ArcMap, right clicked, selected display XY Data. Selected appropriate Y and X field LatDD and LongDD respectively. Set the coordinate system to GCS North American 1983.

Description

Turned event layer into feature class and projected data:

Right click the event layer and select data, export data and saved as a shapefile. Projected shapefile using the project tool from GCS North American 1983 to NAD 1983 BC Environment Albers imported from CMN's S_EG95.shp. Converted shapefile to feature class using feature class to feature class tool.

Description

Extracted target features (as identified within Plants workshop) into separate feature layers.

Added 3 new fields to each of the species-specific feature classes.

New fields are as follows: Feature (common name of marine feature identified), SOURCE_DATA (dataset shapefile name), and Dataset_ID (dataset common identifier as per BCMCA dataset DB notes).

To add fields, used the add field tool in batch mode (right click tool in toolbox and select batch) to update all feature classes at once. Click and drag each feature into the batch field window to populate one row for each feature. To set each feature classes' tool parameters, scroll to the right in the table.

Populated the fields using the calculate field tool in batch mode.

Feature fields were calculated to equal the "scientific name" column.

SOURCE_DATA fields were calculated using the dataset source name (i.e. Algae Export.xls).

Dataset_ID fields were calculated using the common dataset identifier.

Description

Buffered extracted point feature layers to create polygon representations:

**The CDC points are buffered by an uncertainty distance determined using NatureServe’s methodology ( https://www.natureserve.org/). To keep the datasets consistent, the UBC points were also buffered by a width determined by the precision of the recorded coordinates. On a spherical surface at sea level, one latitudinal second measures 30.82 metres and one latitudinal minute 1849 metres, and one latitudinal degree is 110.9 kilometres. These values were rounded up and points that were precise to the second were buffered by 50 m and points that were precise to the minute were buffered by 2000 m**

Created new field called BuffDist_m_ to show applicable buffer distance radius: 50m or 2000m. The buffer tool was used in batch mode (see batch mode explained in step 3) using the BuffDist_m_ field.

Description

Created Metadata.

Date / Time

2008-11-28T11:33:40

Processor

Organisation name	Individual name	Electronic mail address	Role
Coastal Resource Mapping	All processing steps performed by Melissa Meneghetti		Processor

Description

UBC Herbarium (Algae Export). Raw data: Algae_Export.xls. Each recorded specimens represents sample collected within UBC Herbarium. Database contains 50 records for Postelsia palmaeformis, 104 records for Pterygophora californica, and 230 records for all other features. Only online reference index: https://www.botany.ubc.ca/herbarium/algae/index.html

Metadata

File identifier

AF6F50E9-62D3-4824-BE87-C96100817D45 XML

Metadata language

eng

Character set

UTF8

Hierarchy level

Dataset

Date stamp

2023-12-21T02:11:20.487Z

Metadata standard name

ISO-19115/19139 Geographic Information - Metadata

Metadata standard version

ISO-19115-2:2009/19139:2005

Metadata author

Organisation name	Individual name	Electronic mail address	Role
Living Oceans Society (for BCMCA)	Carrie Robb	crobb@livingoceans.org	Author