National Hydro Network (NHN)
01AA000, Headwaters Saint John

  1. Identification Information
  2. Data Quality Information
  3. Spatial Data Organization Information
  4. Spatial Reference Information
  5. Entity and Attribute Information
  6. Distribution Information
  7. Metadata Reference Information

Identification Information

Citation:
Citation Information:
Originator:
Government of Canada; Natural Resources Canada; Earth Sciences Sector; Canada Centre for Mapping and Earth Observation
Publication Date:
2012-02-23
Title:
01AA000, Headwaters Saint John
Edition:
1.0
Geospatial Data Presentation Form:
vector digital data
Series Information:
Series Name:
National Hydro Network (NHN)
Issue Identification:
1.0-CL1_NC1
Publication Information:
Publication Place:
Sherbrooke, Quebec, Canada
Publisher:
Government of Canada; Natural Resources Canada; Earth Sciences Sector; Canada Centre for Mapping and Earth Observation
Online Linkage:
http://www.geobase.ca
Description:
Abstract:
The National Hydro Network (NHN) focuses on providing a quality geometric description and a set of basic attributes describing Canada's inland surface waters. It provides geospatial digital data compliant with the NHN Standard such as lakes, reservoirs, watercourses (rivers and streams), canals, islands, drainage linear network, toponyms or geographical names, constructions and obstacles related to surface waters, etc. The best available federal and provincial data are used for its production, which is done jointly by the federal and interested provincial and territorial partners. The NHN is created from existing data at the 1:50 000 scale or better. In particular, the modeling work of the NHN was based on Linear Reference System (LRS) concepts. This approach allows the management of geometric representation separately from attribute information (referred to as event in LRS). Unique Identifiers are associated with each geometric and event object. These IDs (called National Identifiers - NIDs) will lead to more efficient management of updates between data producers and data users. The NHN data have a great potential for analysis, cartographic representation and display and will serve as base data in many applications.
Purpose:
In 2002, the Canadian Council On Geomatics (CCOG) tasks a group of experts from Nova Scotia Geomatics Centre (NSGC), British Columbia Base Mapping & Geomatics Services (BMGS), and Natural Resources Canada - Centre for Topographic Information (CTI), to undertake to develop the National Hydro Network (NHN) Standard using the same approach used in the development of the National Road Network (NRN). The goal is to produce a complete NHN national coverage in collaboration with Canadian Federal, Provincial and Territorial partners, within the GeoBase initiative framework. In August 2004, the Canadian Council on Geomatics (CCOG) approves the "National Hydro Network, Canada, Level 1, Edition 1.0" Standard in accordance with CCOG resolution F03-05 on GeoBase Data Standard Maintenance. Since the CCOG has officially adopted the NHN Standard, work has begun to produce NHN data compliant to GeoBase. The NHN thus forms the hydrographic layer of the GeoBase. The Canada Centre for Mapping and Earth Observation (CCMEO), part of Natural Resources Canada (NRCan), pursues its goal of capturing and managing NHN data within a network of partners. These partner organizations are selected for their specific interests or for their ease in offering adequate, up-to-date representations of water related phenomena.
Supplemental Information:
NHN-CL1: This National Hydro Network (NHN) dataset contains Completeness Level 1 (CL1) data. For more information about NHN Completeness Levels, please refer to the "Implementation -> Completeness Levels" section of the National Hydro Network product on the GeoBase web portal (www.geobase.ca).Depending on the source data used, the resulting NHN data may present some gaps, deviations or differences compared to NHN standards and specifications (re: missing features and attribute values, spatial relations not respected, etc.). When this happens, those differences are documented under the "Data -> Differences in NHN Data" section of the National Hydro Network product on the GeoBase web portal (www.geobase.ca). This product is subject to discrepancies detection process. A discrepancy is defined as any deviation of dataset (or metadata) from the NHN product's Standards and Specifications. For more information about discrepancies, please refer to the "Discrepancies / Comments" section of the National Hydro Network product on the GeoBase web portal (www.geobase.ca).
Time Period of Content:
Time Period Information:
Range of Dates/Times:
Beginning Date:
1987
Ending Date:
2007
Currentness Reference:
ground condition
Status:
Progress:
Complete
Maintenance and Update Frequency:
Unknown
Spatial Domain:
Bounding Coordinates:
West Bounding Coordinate:
-70.5
East Bounding Coordinate:
-69.6
North Bounding Coordinate:
46.9
South Bounding Coordinate:
45.9
Keywords:
Theme:
Theme Keyword Thesaurus:
GCMD (Global Change Master Directory)
Theme Keyword:
Banks
Theme Keyword:
Earth Science > Hydrosphere > Surface Water > Lakes
Theme Keyword:
Earth Science > Hydrosphere > Surface Water > Watershed Characteristics
Theme Keyword:
Hydrography
Theme Keyword:
Earth Science > Hydrosphere > Surface Water > Water Channels
Theme Keyword:
Waterbody
Theme Keyword:
Earth Science > Hydrosphere > Surface Water > Rivers/Streams
Theme Keyword:
Earth Science > Hydrosphere > Surface Water > Discharge/Flow
Theme Keyword:
Earth Science > Oceans > Coastal Processes > Shorelines
Theme Keyword:
Coastline
Theme Keyword:
Hydro Network
Theme Keyword:
Earth Science > Human Dimensions > Infrastructure > Transportation
Theme Keyword:
Hydro Traversal
Theme Keyword:
Littoral
Theme Keyword:
Inland Surface Water
Theme Keyword:
Earth Science > Hydrosphere > Surface Water > Drainage
Theme Keyword:
Toponyms/Geographical Names
Theme Keyword:
Earth Science > Biosphere > Terrestrial Ecosystems > Islands
Place:
Place Keyword Thesaurus:
GCMD (Global Change Master Directory)
Place Keyword:
Continent > North America > Canada > Quebec
Place Keyword:
Continent > North America > United States of America
Place Keyword:
Eaux d'amont de la Saint-Jean
Place Keyword:
Continent > North America > Canada
Place Keyword:
Headwaters Saint John
Place Keyword:
01AA000
Access Constraints:
Open Government Licence - Canada (http://data.gc.ca/eng/open-government-licence-canada)
Use Constraints:
Open Government Licence - Canada (http://data.gc.ca/eng/open-government-licence-canada)

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Data Quality Information

Attribute Accuracy:
Attribute Accuracy Report:
The majority of NHN features and attributes are directly populated from source data features and attributes (federal, provincial or others). Some features and attributes were generated from automated and/or manual processes. Substantial automated and manual QA checks have been performed to ensure compliance with the various concepts related to attributes. Inconsistencies were either fixed or noted as NHN model deviations (refer to the "Supplemental information" section herewith).
Logical Consistency Report:
Source data used in the generation of NHN data have previously undergone QA checks in regards to their content and structure. Resulting NHN data are organized and structured according to the NHN conceptual Standard as well as to its distribution profile, both available under the "Documentation" section of the National Hydro Network product on the GeoBase Web portal (www.geobase.ca). The NHN Standard Data Catalogue stipulates the spatial integrity constraints which assure coherence between NHN features. NHN data have undergone extensive automated and interactive validation processes to ensure among others:
- Spatial integrity constraints between features;
- Area mathematical closure;
- Network connectivity;
- Network and feature directionality;
- Bank orientations;
- Hydro event positioning;
- NHN data presence/omissions.
Inconsistencies were either fixed or noted as NHN deviations with the NHN data model (refer to the "Supplemental information" section herewith).

Completeness Report:
The NHN is created from the best existing data available (federal, provincial or other data). The majority of NHN features and attributes are directly populated from source data features and attributes. In so doing the richness of the source data (re : accuracy, data density, geometry, ...) is preserved to the level authorized by the NHN data model. In particular this means that source data are not filtered nor degraded in order to produce NHN data.

NHN data are compliant with the NHN Standards in accordance with the NHN Implementation Strategy. For more information on the NHN Implementation Strategy refer to the "Implementation -> NHN Implementation Strategy" section of the National Hydro Network product on the GeoBase Web portal (www.geobase.ca).

Also, depending on the source data used, NHN data may present some deviations or discrepancies compared to NHN standards and specifications. For more information on the NHN deviations refer to the "Data -> Differences in NHN Data" section of the National Hydro Network product on the GeoBase Web portal (www.geobase.ca).

Positional Accuracy:
Horizontal Positional Accuracy:
Horizontal Positional Accuracy Report:
The geometric accuracy of NHN features on the Canadian territory is given as the difference between features position in the dataset and their real ground positions measured in reference to the geodetic network. The accuracy may vary from one feature to another. It is thus provided in attribute with each feature and is expressed in accordance with the Circular Map Accuracy Standard (CMAS).
Standard circular error : Sc = 0.7071 (Sx^2 + Sy^2)^1/2 where
^: exponent,
Sx: standard deviation in the X-axis,
Sy: standard deviation in the Y-axis,
Circular Map Accuracy Standard:
CMAS = 2.1460 Sc.
The NHN aims at obtaining a CMAS of 30 metres or better. This accuracy is based on Landsat 7 orthoimages and the GeoBase Data Alignment Layer.
As NHN data is created using available data sources (e.g. federal or provincial data), a dataset's planimetric accuracy is based on the source data. When a federal source data is used (e.g. NTDB data at the 1:50,000 scale), the planimetric accuracy (CMAS) is equivalent or better then that of the Landsat7 orthorectified product (available on the GeoBase portal), that is to say generally 30 metres or better. When a provincial source is used, the planimetric accuracy is generally better than 30 metres, reaching only a few metres in some cases.
The geometric accuracy of NHN features beyond the Canadian territory is not qualified.
Quantitative Horizontal Positional Accuracy Assessment:
Horizontal Positional Accuracy Value:
12
Horizontal Positional Accuracy Explanation:
Upper bound of the Circular Map Accuracy Standard (CMAS) domain of values for the NHN. This means that features in this dataset generally have an accuracy value smaller or equal to this value. For more information, please refer to object metadata associated to the dataset features.
Lineage:
Process Step:
Process Description:
The production of NHN data straddling the Canada/U.S.A International Boundary was carried-out within the scope of an agreement between the Earth Sciences Sector of Natural Resources Canada (NRCan) and the U.S. Geological Survey (USGS), of the U.S.A. Department of the Interior. The goal of the agreement is to harmonise hydrographic data that reside with each of the participants by creating complete and common trans-boundary drainage areas between the two countries at the International Boundary. Resulting drainage areas are thus available via the GeoBase and USGS Web Portals, respectively in the NHN and NHD (National Hydrography Dataset from USGS) data models.

The production of trans-boundary Canada/U.S.A. NHN Work Units is carried-out in 4 phases:

1- The delineation of the trans-boundary drainage areas was carried-out in collaboration with the USGS and the International Joint Commission (IJC). Initially based on the Water Survey of Canada Sub-Sub-Drainage Areas (WSCSSDA 5.0, 2003), NHN Work Unit (WU) limits straddling the International Boundary may have been modified, divided or merged to others in order to line-up with those of the Watershed Boundary Dataset (WBD) co-manage by the United States Department of Agriculture (USDA) and USGS. NHN Dataset names of trans-boundary WU have for the most part been modified, mainly by substituting the last character by a "0" and the fifth by a letter when the initial WU was subdivided.

2- Data preparation consists of obtaining and uploading into a single work file, Canadian hydrographic data from NRCan's internal Geospatial Database (GDB) and NHD data for the American portion.

3- The horizontal edge-match of hydrographic data crossing the International Boundary aims the creation of a continuous network for the whole WU by aligning common features on both sides of the International Boundary (mainly single line watercourses, waterbodies and virtual network lines within waterbodies).

4- The creation of final trans-boundary NHN datasets consists of converting aligned NHD data to the NHN data model and merging resulting NHN data from both sides of the International Boundary into single trans-boundary NHN datasets.

The Completeness Level for the Canadian portion of the resulting NHN data corresponds to that of the previous edition or when originating from more that one WU to the lowest level of the latter. The Completeness Level does not apply to the American portion of the NHN data.
Process Date:
2012-02-23
Process Step:
Process Description:
The initial production of NHN data at the Completeness Level 1 (NHN-CL1) carried-out by the Canada Centre for Mapping and Earth Observation(CCMEO) is achieved via a nearly full-automated NHN-CL1 production process. The source data used in this process comes from NRCan's internal Geospatial Database (GDB), in which data is stored as per the National Topographic System (NTS) delineation, and from the Canadian Geographical Names Data Base (CGNDB). NHN WU Limits are for their part based on the Water Survey of Canada Sub-Sub-Drainage Areas (WSCSSDA 5.0, 2003).

Because water definition types are not known for all GDB single line watercourses and waterbodies for the entire WU, this latter is defined at completeness level 1.

The initial production of NHN-CL1 data is carried-out in 4 phases:

1- The NHN Work Unit definition consists in doing the required modifications to the WSCSSDA limits in order to contain all hydrographic features required for the creation of NHN data.

2- The data preparation consists of extracting the required hydrographic data from the GDB and merging it into WU.

3- The completion of the hydro network required data includes the creation of Inferred type Network Linear Flows (NLF), the determination of priority levels (Primary or Secondary) for NLF, the determination of the flow direction for Primary type NLF, the creation of islands and the association of geographical names to NHN features.

4- The NHN data creation consists of validating the hydro network, generating the final NHN data of which Delimiter and Hydro Junction features and loading the data into the GeoBase database.
Process Date:
2008-02-21

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Spatial Data Organization Information

Direct Spatial Reference Method:
Vector

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Spatial Reference Information

Horizontal Coordinate System Definition:
Geographic:
Latitude Resolution:
0.0000001
Longitude Resolution:
0.0000001
Geographic Coordinate Units:
Decimal degrees
Geodetic Model:
Horizontal Datum Name:
NAD83CSRS (North American Datum 1983 in Canadian Spatial Reference System)
Ellipsoid Name:
Geodetic Reference System 80
Semi-major Axis:
6378137.0
Denominator of Flattening Ratio:
298.257222101

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Entity and Attribute Information

Overview Description:
Entity and Attribute Overview:
Entities and attributes are described in details in the National Hydro Network Feature Catalogue, Distribution profile.
Entity and Attribute Detail Citation:
National Hydro Network, Feature Catalogue, Distribution Profile, Edition 1.0.1, 2008-06-01

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Distribution Information

Distributor:
Contact Information:
Contact Organization Primary:
Contact Organization:
Government of Canada; Natural Resources Canada; Earth Sciences Sector; Canada Centre for Mapping and Earth Observation
Contact Person:
GeoBase Technical Support
Contact Address:
Address Type:
mailing and physical
Address:
2144, King Street West, Suite 010
City:
Sherbrooke
State or Province:
Quebec
Postal Code:
J1J 2E8
Country:
Canada
Contact Voice Telephone:
+01-819-564-5600 / 1-800-661-2638 (Canada and USA)
Contact Facsimile Telephone:
+01-819-564-5698
Contact Electronic Mail Address:
SupportGeoBase@nrcan.gc.ca
Hours of Service:
8:30 AM to 12:00 PM and from 1:00 PM to 4:30 PM (Eastern Time)
Distribution Liability:
Data are subject to the Open Government Licence - Canada (http://data.gc.ca/eng/open-government-licence-canada)
Standard Order Process:
Digital Form:
Digital Transfer Information:
Format Name:
ESRI Shapefiles
Digital Transfer Option:
Online Option:
Computer Contact Information:
Network Address:
Network Resource Name:
http://www.geobase.ca
Digital Form:
Digital Transfer Information:
Format Name:
GML (Geography Markup Language)
Digital Transfer Option:
Online Option:
Computer Contact Information:
Network Address:
Network Resource Name:
http://www.geobase.ca
Digital Form:
Digital Transfer Information:
Format Name:
ESRI FGDB (File Geodatabase)
Digital Transfer Option:
Online Option:
Computer Contact Information:
Network Address:
Network Resource Name:
http://www.geobase.ca
Fees:
Free (or No cost)

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Metadata Reference Information

Metadata Date:
2012-02-23
Metadata Contact:
Contact Information:
Contact Organization Primary:
Contact Organization:
Government of Canada; Natural Resources Canada; Earth Sciences Sector; Canada Centre for Mapping and Earth Observation
Contact Person:
GeoBase Technical Support
Contact Address:
Address Type:
mailing and physical
Address:
2144, King Street West, Suite 010
City:
Sherbrooke
State or Province:
Quebec
Postal Code:
J1J 2E8
Country:
Canada
Contact Voice Telephone:
+01-819-564-5600 / 1-800-661-2638 (Canada and USA)
Contact Facsimile Telephone:
+01-819-564-5698
Contact Electronic Mail Address:
SupportGeoBase@nrcan.gc.ca
Hours of Service:
8:30 AM to 12:00 PM and from 1:00 PM to 4:30 PM (Eastern Time)
Metadata Standard Name:
FGDC Content Standard for Digital Geospatial Metadata
Metadata Standard Version:
FGDC-STD-001-1998
Metadata Use Constraints:
Only the English version of the metadata XML file is valid according to XML schema (W3C) as defined by FGDC (http://www.fgdc.gov). French version of the metadata XML file is not valid as it does not always respect domain values for all fields which are sometimes only available in English. The French version is issued mainly for display purposes. User must ensure to validate metadata against the XML schema English version.