Metadata: Nanaimo Lowlands Hydrogeological Units

Metadata NAP : more info

Identification

Abstract

This dataset shows the hydrostratigraphic units of the Nanaimo Lowland aquifer, British Columbia. The study area is from Nanoose Bay to Deep Bay, designating a low relief coastal strip along the southeastern part of Vancouver Island, BC. The hydrostratigraphic units were defined using the relation between geology and hydrogeological properties of materials that compose the aquifer system. The aquifer system is composed of 9 hydrostratigraphic units: 1) Capilano-Salish; 2) Capilano; 3) Vashon-Capilano; 4) Vashon; 5) Quadra; 6) Cowichan-Dashwood; 7) Dashwood-Mapleguard; 8) Bedrock - Lower Nanaimo Group and; 9) Bedrock - Metamorphic and Intrusive Basement.

Status:

completed

Title

Nanaimo Lowlands Hydrogeological Units

Date

2016-03-31 ( register

publication)

Date

2016-02-03 ( register

revision)

Edition

Edition date

Citation group

principalInvestigator

Name

Nicolas Benoît

Organisation

Government of Canada; Natural Resources Canada; Geological Survey of Canada - GSC Quebec

Position

Information

Address	Delivery point : 490, rue de la Couronne, 3e étage 490, rue de la Couronne, 3e étage City : Québec Québec Administrative region : Québec Québec Postal code : Country : Canada Canada Email nicolas.benoit@canada.ca
Telephone	voice; 1 (418) 6543646
Online Resource

Citation group

originator

Name

Nicolas Benoît

Organisation

Government of Canada; Natural Resources Canada; Geological Survey of Canada - GSC Quebec

Position

Information

Address	Delivery point : 490, rue de la Couronne, 3e étage 490, rue de la Couronne, 3e étage City : Québec Québec Administrative region : Québec Québec Postal code : Country : Canada Canada Email nicolas.benoit@canada.ca
Telephone	voice; 1 (418) 6543646
Online Resource

Citation group

custodian

Name

Francois Letourneau

Organisation

Government of Canada; Natural Resources Canada; Geological Survey of Canada - GSC Quebec

Position

Information

Address	Delivery point : 490, rue de la Couronne, 3e étage 490, rue de la Couronne, 3e étage City : Québec Québec Administrative region : Québec Québec Postal code : Country : Canada Canada Email francois.letourneau@canada.ca
Telephone	voice; 1 (418) 6543826
Online Resource

Citation group

pointOfContact

Name

Organisation

Government of Canada; Natural Resources Canada; Geological Survey of Canada

Position

Information

Address	Delivery point : City : Administrative region : Postal code : Country : Email nrcan.gsc-geosciencedata-donneesgeoscience-cgc.rncan@canada.ca
Telephone
Online Resource

Presentation form

mapDigital

Series

Other

Goals

This map was created to provide a regional frame of the spatial distribution of the hydrostratigraphic units and hydrogeological contexts within Nanaimo Lowland area.

Keyword(s)

Spatial representation	vector
Resolution	175000
Language	eng; CAN
Language	fra; CAN
Character encoding	utf8
Thematic category	geoscientificInformation
Extent	-124.790612000,49.196682000;-124.108548000,49.465750000
Supplemental information

Distribution

Specific information related to data distribution

Format
Name	WMS
Version	1.3.0

Format
Name	HTML
Version	5

Format
Name	CSV
Version	unknown

Format
Name	JSON
Version	unknown

Format
Name	GML
Version	unknown

Format
Name	KML
Version	unknown

Format
Name	dxf
Version	unknown

Format
Name	SHP
Version	unknown

Format
Name	SHP
Version	not applicable

Distributor

Contact

distributor

Name

Eric Boisvert

Organisation

Government of Canada; Natural Resources Canada; Geological Survey of Canada - GSC Quebec

Position

Information

Address	Delivery point : 490, rue de la Couronne, 3e étage 490, rue de la Couronne, 3e étage City : Québec Québec Administrative region : Québec Québec Postal code : Country : Canada Canada Email eric.boisvert2@canada.ca
Telephone	voice; 1 (418) 6543705
Online Resource

Distributor

Contact

pointOfContact

Name

Organisation

Government of Canada; Natural Resources Canada; Geological Survey of Canada

Position

Information

Address	Delivery point : City : Administrative region : Postal code : Country : Email nrcan.gsc-geosciencedata-donneesgeoscience-cgc.rncan@canada.ca
Telephone
Online Resource

Transfer options

Quality

Quality description scope : register

dataset

Lineage

Message Date lineage
Lineage is the description of the sources and steps used to create the current dataset.

Introduction
Hydrostratigraphic units and hydrogeologic contexts shapefile creation Hydrostratigraphic units and hydrogeologic contexts shapefile creation

Process step

Sources

The original datasets show a shapefile for the bedrock and a raster for each hydrostratigraphic unit. The raster was converted into vector, using the ""Raster to polygon"" conversion tool. If the raster was floating point file type, the ""Int"" tool was used to convert the floating point raster to an integer value. The raster can then be converted into polygons. The polygons were aggregate using the tool ""aggregate polygons"" with an aggregation distance of 50 m. The polygons considered as unnecessary (mainly one pixel isolated polygons) were selected by their area and erased of the attribute table. The polygons contours were generalized using the ""smooth polygon"" tool with PAEK algorithm and a smoothing tolerance of 200 m. After the files process to obtain hydrogeologic contexts, all the shapefiles obtained: hydrostratigraphic units (7); bedrock (1) and hydrogeologic contexts (4) were combine in one shapefile, using the merge tool. The identification of each polygon was done in the attribute table.

Benoit, N., Paradis, D., Bednarski, J.M., Hamblin, T., and Russell, H.A.J., 2015. Three dimensional hydrostratigraphic model of the Nanoose-Deep Bay area, Nanaimo Lowland, British Columbia; Geological Survey of Canada, Open File 7796, 1 .zip file. doi:10.4095/296302

The hydrogeologic contexts were presented by an image (Fi.8 of the cited article). First, the image was georeferenced with a shapefile of the study area delimitation. The image was georeferenced using the « Georeferencing » toolbar in ArcGis. To bring the image roughly in the right location, a ""fit to display"" was applied. Three control points were then created to perfectlty overstrike the image and the study area shapefile. To do so, the « add control points » tool was used. The study area shapefile was duplicated by exporting data. The hydrogeologic contexts were then defined using the ""cut polygons"" tool on the study area duplicate shapefile. Each hydrogeologic context was identified in the attribute table. After the files process to obtain hydrostratigraphic units shapefiles, all the shapefiles obtained: hydrostratigraphic units (7); bedrock (1) and hydrogeologic contexts (4) were combine into one, using the merge tool. The identification of each polygon was done in the attribute table.

Technical details and constraints

File identifier	fefec7a1-091c-6c6e-9521-e0623797edd7
Language	eng; CAN
Character encoding	utf8
Hierarchical classification	dataset
Date	2017-04-18
Metadata standard	North American Profile of ISO 19115:2003 - Geographic information - Metadata
Version	CAN/CGSB-171.100-2009
Constraints
Update frequency	asNeeded

Regionalisation

Metadata are available in those languages (You can use language menu item in the top menu bar to switch language):

Language code	Pays	Encodage
French	Canada	utf8

Geographic Reference System

Reference System code	EPSG:26910
Register	http://www.epsg-registry.org/
Version	6.14

Metadata Contact

author

Name

Francois Letourneau

Organisation

Government of Canada; Natural Resources Canada; Geological Survey of Canada - GSC Quebec

Position

Information

Address	Delivery point : 490, rue de la Couronne, 3e étage 490, rue de la Couronne, 3e étage City : Québec Québec Administrative region : Québec Québec Postal code : Country : Canada Canada Email francois.letourneau@canada.ca
Telephone	voice; 1 (418) 6543826
Online Resource

pointOfContact

Name

Organisation

Government of Canada; Natural Resources Canada; Geological Survey of Canada

Position

Information

Address	Delivery point : City : Administrative region : Postal code : Country : Email nrcan.gsc-geosciencedata-donneesgeoscience-cgc.rncan@canada.ca
Telephone
Online Resource