Desmarestia_tortuosa_Final

Metadata also available as

Metadata:


Identification_Information:
Citation:
Citation_Information:
Originator:
The British Columbia Marine Conservation Analysis (BCMCA), a Tides Canada Initiatives Project
Publication_Date: 12/2008
Title: Desmarestia_tortuosa_Final
Geospatial_Data_Presentation_Form: vector digital data
Online_Linkage:
\\CARRIE\E\Andy_Bcmca\data_processed_namedStandardized\Plants\BCMCA_Algae_Final_01212009.mdb
Description:
Abstract:
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.
Purpose:
The purpose of this dataset is to identify areal extents of Desmarestia tortuosa presence that helps inform the marine feature identified at the BCMCA Marine Plants Workshop.
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. 2. CDC. Identifies species as element occurrence's.
Time_Period_of_Content:
Time_Period_Information:
Single_Date/Time:
Calendar_Date: unknown
Currentness_Reference: ground condition
Status:
Progress: In work
Maintenance_and_Update_Frequency: Unknown
Spatial_Domain:
Bounding_Coordinates:
West_Bounding_Coordinate: -127.657271
East_Bounding_Coordinate: -125.016985
North_Bounding_Coordinate: 50.614741
South_Bounding_Coordinate: 48.853710
Keywords:
Theme:
Theme_Keyword_Thesaurus:
REQUIRED: Reference to a formally registered thesaurus or a similar authoritative source of theme keywords.
Theme_Keyword: Desmarestia tortuosa
Theme_Keyword: Algae
Place:
Place_Keyword: British Columbia
Access_Constraints:
This dataset is subject to the terms and conditions of the data use agreements for the source datasets.
Use_Constraints:
This dataset is subject to the terms and conditions of the data use agreements for the source datasets.
Point_of_Contact:
Contact_Information:
Contact_Organization_Primary:
Contact_Organization: BCMCA
Contact_Person: Karin Bodtker
Contact_Position: Co-chair
Contact_Address:
Address_Type: mailing and physical address
Address: 1405-207 West Hastings Street
City: Vanvouver
State_or_Province: BC
Postal_Code: V6B 1H7
Country: Canada
Contact_Voice_Telephone: 604-696-5044
Native_Data_Set_Environment:
Microsoft Windows XP Version 5.1 (Build 2600) Service Pack 2; ESRI ArcCatalog 9.3.1.3500

Data_Quality_Information:
Lineage:
Source_Information:
Source_Contribution:
CDC Algae data. Dataset name: alga_eos.shp. Mapped areas of land/water (Element Occurrence) in which a species (algae) or ecological community is, or was, present and provincial ranking applied. The CDC follows NatureServe mapping methodolgy whereby Element Occurances are depicted as polygons. Locations are supplied via lat/long coordinates, and bufferred according to locational uncertainties. Includes rare algae names for 50 species short listed. Original metadata document: Online <http://www.env.gov.bc.ca/cdc/gis/eo_data_fields_06.htm>
Source_Information:
Source_Contribution:
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: <http://www.botany.ubc.ca/herbarium/algae/index.html>
Process_Step:
Process_Description:
<<The methods used to combine datasets to identify areal extents of Desmarestia tortuosa presence are as follows >>
Source_Used_Citation_Abbreviation:
\\CRMLTD03\E$\F\Crm1143\Source\080818_SourceDocs\Original_Data\Plants\BCMCA_Plants.gdb
Process_Step:
Process_Description:
--> To prepare CDC dataset:
Re-projected CDC's alga_eos.shp from an Unknown Coordinate System to NAD 1983 BC Environment Albers imported from CMN's BS_EG95.shp. Converted shapefile to feature class using feature class to feature class tool. Selected from CDC_algae_eos.shp all marine target features identified in Plants workshop and exported into separate feature classes. Using ArcMap, all records applicable to workshop target species were selected in the attributes table, exported into a feature class, and stored within the Algae Geodatabase.
Source_Used_Citation_Abbreviation:
\\CRMLTD03\E$\F\Crm1143\Source\080818_SourceDocs\Original_Data\Plants\BCMCA_Plants.gdb
Process_Step:
Process_Description:
Added 3 fields to CDC feature layers: Feature (common name of marine feature identified), SOURCE_DATA (dataset shapefile name), 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.
Process_Step:
Process_Description:
Populated the fields using the calculate field tool in batch mode. Feature fields were calculated to equal the "SNAME" column. SOURCE_DATA fields were calculated to equal the name of the shapefile or feature class that the data was derived from. Dataset_ID fields were calculated to equal the common dataset identifier as categorized by BCMCA.
Process_Step:
Process_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.
Process_Step:
Process_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.
Process_Step:
Process_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.
Process_Step:
Process_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.
Process_Step:
Process_Description:
Extracted target features (as identified within Plants workshop) into separate feature layers. Duplicate UBC points that had identical attribute and spatial information were deleted. 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.
Process_Step:
Process_Description:
Buffered extracted point feature layers to create polygon representations: **The CDC points are buffered by an uncertainty distance determined using NatureServe’s methodology (<http://www.natureserve.org/prodServices/eodraft/7.pdf>). 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.
Process_Step:
Process_Description:
-->To prepare both CDC and UBC feature layers for merge:
Searched for duplicate records between CDC and UBC feature layers. Overlaid both datasets and searched for any UBC data points (unbuffered) that fell within the polygonal area of an CDC polygon. If a UBC point was found within, or in close proximity to a CDC polygon, the observation date of both datasets was reviewed and if found to be the same, the UBC point was deleted.
Process_Step:
Process_Description:
To simplify potential issues in the merging process, all CDC feature class layers and all UBC feature class layers were first merged together separately using the merge tool. These were then merged together for a second time so the end resultant feature layer included both UBC and CDC data layers. Individual species were then extracted from the combined datasets.
During UBC merge only the following fields were retained: Date, LattDD (decimal degree latitude), LongDD, BuffDist_m_ (Buffer distance in meters), Feature (Genus and species of workshop target), Source_data (the original shapefile, feature class, or table the information was obtained from) and DatasetID (the common dataset identifier as found within BCMCA dataset DB notes). All records with 0,0 coordinates were removed.
During the CDC merge, only the following fields were retained: LATITUDE, LONGITUDE, DATE_, BuffDist_m_ (Buffer distance in meters), Feature (Genus and Species name of target feature as identified within Plants), Source_data (the original shapefile, feature class, or table the information was obtained from), and DatasetID. **Note: survey date field had its name changed to DATE_ to match the UBC column naming convention.
Process_Step:
Process_Description: Merged the CDC and UBC feature layers using merge tool.
Process_Step:
Process_Description:
Extracted Desmarestia tortuosa features from the merged CDC and UBC data: Within ArcMap, all records applicable to target feature were selected in the attributes table and exported into a feature class. (right click feature class in table of contents and select data -> export data).
Process_Step:
Process_Description: Created Metadata.
Source_Used_Citation_Abbreviation: C:\F\Crm1143\Admin\MetaData\BullKelp_Final.xml
Process_Step:
Process_Description:
Using field calculator, selected all CDC records and populated BuffDist_m field to equal "CDC Determined".
Process_Step:
Process_Description: Updated metadata.
Process_Contact:
Contact_Information:
Contact_Person_Primary:
Contact_Person: All processing steps performed by Melissa Meneghetti
Contact_Organization: Coastal Resource Mapping
Contact_Position: Spatial Analyst

Spatial_Data_Organization_Information:
Direct_Spatial_Reference_Method: Vector
Point_and_Vector_Object_Information:
SDTS_Terms_Description:
SDTS_Point_and_Vector_Object_Type: G-polygon
Point_and_Vector_Object_Count: 8
SDTS_Terms_Description:
SDTS_Point_and_Vector_Object_Type: Label point
Point_and_Vector_Object_Count: 39346
SDTS_Terms_Description:
SDTS_Point_and_Vector_Object_Type: GT-polygon composed of chains
Point_and_Vector_Object_Count: 39346
SDTS_Terms_Description:
SDTS_Point_and_Vector_Object_Type: Point
Point_and_Vector_Object_Count: 4

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: coordinate pair
Coordinate_Representation:
Abscissa_Resolution: 0.000100
Ordinate_Resolution: 0.000100
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
Vertical_Coordinate_System_Definition:
Altitude_System_Definition:
Altitude_Resolution: 0.000100
Altitude_Encoding_Method:
Explicit elevation coordinate included with horizontal coordinates

Entity_and_Attribute_Information:
Detailed_Description:
Entity_Type:
Entity_Type_Label: Desmarestia_tortuosa_Final
Attribute:
Attribute_Label: Shape
Attribute_Definition: Feature geometry.
Attribute_Definition_Source: ESRI
Attribute_Domain_Values:
Unrepresentable_Domain: Coordinates defining the features.
Attribute:
Attribute_Label: Shape_Area
Attribute_Definition: Area of feature in internal units squared.
Attribute_Definition_Source: ESRI
Attribute_Domain_Values:
Unrepresentable_Domain: Positive real numbers that are automatically generated.
Attribute:
Attribute_Label: DATE_
Attribute_Definition: Observation Date
Attribute:
Attribute_Label: LATDD
Attribute_Definition:
UBC specific field. Latitude of coordinate in Decimal Degrees. Values were converted from DM and DMS from original source.
Attribute:
Attribute_Label: LONGDD
Attribute_Definition:
UBC specific field. Longitude of coordinate in Decimal Degrees. Values were converted from DM and DMS from original source.
Attribute:
Attribute_Label: Feature
Attribute_Definition: Genus and Species name of marine feature.
Attribute:
Attribute_Label: SOURCE_DATA
Attribute_Definition:
The name of shapefile, feature class or table data was derived from.
Attribute:
Attribute_Label: Dataset_ID
Attribute_Definition: Common dataset identifier as categorized by BCMCA.
Attribute:
Attribute_Label: LATITUDE
Attribute_Definition:
CDC specific field. Latitude coordinates of original observation polygons. This will not necessarily be the centroid of all polygons as some polygons were merged together keeping attributes from only one of the polygons.
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: Shape_Length
Attribute_Definition: Length of feature in internal units.
Attribute_Definition_Source: ESRI
Attribute_Domain_Values:
Unrepresentable_Domain: Positive real numbers that are automatically generated.
Attribute:
Attribute_Label: LONGITUDE
Attribute_Definition:
CDC specific field. Longitude coordinates of original observation polygons. This will not necessarily be the centroid of all polygons as some CDC polygons were merged together keeping the attributes from only one of the polygons.
Attribute:
Attribute_Label: BuffDist_m_
Attribute_Definition:
UBC specific field. Displays the value used as a buffer radius for each point location. Values are either 50m or 2000m. These values are based on locational uncertainty of original coordinates. Values accurate to the minute were buffered with 2000m radius. Values accurate to the second were buffered to 50m (rounded up from 30.82m).
Overview_Description:

Distribution_Information:
Distributor:
Contact_Information:
Contact_Organization_Primary:
Contact_Organization: British Columbia Marine Conservation Analysis
Contact_Instructions: See www.bcmca.ca for distribution details
Resource_Description: Downloadable Data
Standard_Order_Process:
Digital_Form:
Digital_Transfer_Information:
Transfer_Size: 50.954

Metadata_Reference_Information:
Metadata_Date: 20100925
Metadata_Contact:
Contact_Information:
Contact_Organization_Primary:
Contact_Organization: Living Oceans Society (for BCMCA)
Contact_Person: Carrie Robb
Contact_Position: GIS Specialist
Contact_Address:
Address_Type: mailing and physical address
Address: 1405-207 W. Hastings St.
City: Vancouver
State_or_Province: BC
Postal_Code: V6B 1H7
Country: Canada
Contact_Voice_Telephone: (604) 696-5044
Contact_Electronic_Mail_Address: crobb@livingoceans.org
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

Generated by mp version 2.9.6 on Sun Sep 26 00:47:40 2010