NHS2022 TRCA

Description

TRCA's Updated Natural Heritage System continues to build on the systems thinking and the guiding principles of the Terrestrial Natural Heritage System Strategy (TRCA 2007). It encompasses technical updates to the data and methods behind delineation of the target NHS to incorporate the latest science on integrated natural systems, especially in urban and near urban areas. This includes expanding the scope of the target NHS (i) to include terrestrial as well as aquatic and hydrologically important areas, and (ii) to consider contribution of existing and potential natural cover as well as contributing areas in the built portions of the landscape.

In total, 36 criteria (and an additional cost parameter) were used in the Marxan analysis. Marxan is a science-based approach that aims to solve the minimum-set problem to include a certain amount of features (e.g., ecological) for the smallest possible cost to conservation targets for its reserve selection (Possingham et al. 2000). Criteria for the reserve selection process were based on the Provincial Policy Statement (2020) NHS defined by natural heritage features that are needed to support biodiversity, natural functions and terrestrial and aquatic ecosystems. The Natural Heritage Reference Manual (OMNR 2010) and Provincial Policy Statement (2020) defined natural heritage features including wetlands, wildlife habitat, woodlands, and valleylands for their environmental and social values as a legacy of the natural landscapes of an area. Eight criteria defined the locked-in criteria where the value was assigned that such significant natural features are automatically included in the final scenario solution. Criteria were ecological and natural heritage features within 1-hectare hexagonal planning units. Marxan sets the proportion of representation for each criterion to be included in the solution, which were set based on the amount of locked-in criteria and then any additional amount would be included with the proportion of representation of criteria. Th

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Additional Info

Field Value
Last Updated May 19, 2026, 16:32 (UTC)
Created May 19, 2026, 16:32 (UTC)
Domain / Topic
Domain or topic of the dataset being cataloged.
Title
Title for the Dataset.
NHS2022 TRCA
Description
A description of the dataset.

Description

TRCA's Updated Natural Heritage System continues to build on the systems thinking and the guiding principles of the Terrestrial Natural Heritage System Strategy (TRCA 2007). It encompasses technical updates to the data and methods behind delineation of the target NHS to incorporate the latest science on integrated natural systems, especially in urban and near urban areas. This includes expanding the scope of the target NHS (i) to include terrestrial as well as aquatic and hydrologically important areas, and (ii) to consider contribution of existing and potential natural cover as well as contributing areas in the built portions of the landscape.

In total, 36 criteria (and an additional cost parameter) were used in the Marxan analysis. Marxan is a science-based approach that aims to solve the minimum-set problem to include a certain amount of features (e.g., ecological) for the smallest possible cost to conservation targets for its reserve selection (Possingham et al. 2000). Criteria for the reserve selection process were based on the Provincial Policy Statement (2020) NHS defined by natural heritage features that are needed to support biodiversity, natural functions and terrestrial and aquatic ecosystems. The Natural Heritage Reference Manual (OMNR 2010) and Provincial Policy Statement (2020) defined natural heritage features including wetlands, wildlife habitat, woodlands, and valleylands for their environmental and social values as a legacy of the natural landscapes of an area. Eight criteria defined the locked-in criteria where the value was assigned that such significant natural features are automatically included in the final scenario solution. Criteria were ecological and natural heritage features within 1-hectare hexagonal planning units. Marxan sets the proportion of representation for each criterion to be included in the solution, which were set based on the amount of locked-in criteria and then any additional amount would be included with the proportion of representation of criteria. Th
Tags / Keywords
Keywords/tags categorizing the dataset.
Format (CSV, XLS, TXT, PDF, etc)
File format of the dataset.
Dataset Size
Dataset size in megabytes.
73992.0
Metadata Identifier
Metadata identifier – can be used as the unique identifier for catalogue entry
Published Date
Published date of the dataset.
2022-02-18
Time Period Data Span (start date)
Start date of the data in the dataset.
Time Period Data Span (end date)
End date of time data in the dataset.
GeoSpatial Area Data Span
A spatial region or named place the dataset covers.
Field Value
Access category
Type of access granted for the dataset (open, closed, service, etc).
public
License
License used to access the dataset.
License not specified
Limits on use
Limits on use of data.
Location
Location of the dataset.
https://trca-camaps.opendata.arcgis.com/datasets/camaps::nhs2022-trca
Data Service
Data service for accessing a dataset.
Owner
Owner of the dataset.
trca_d.macleod
Contact Point
Who to contact regarding access?
Conservation Ontario
Contact Point Email
The email to contact regarding access?
[email protected]
Publisher
Publisher of the dataset.
Conservation Ontario
Publisher Email
Email of the publisher.
Author
Author of the dataset.
trca_d.macleod
Author Email
Email of the author.
Accessed At
Date the data and metadata was accessed.
2025-08-01
Field Value
Identifier
Unique identifier for the dataset.
d37e3f4b66d14564b0917c38115fe3a9
Language
Language(s) of the dataset
English
Link to dataset description
A URL to an external document describing the dataset.
https://trca-camaps.opendata.arcgis.com/datasets/camaps::nhs2022-trca
Persistent Identifier
Data is identified by a persistent identifier.
Globally Unique Identifier
Data is identified by a persistent and globally unique identifier.
Contains data about individuals
Does the data hold data about individuals?
Contains data about identifiable individuals
Does the data hold identifiable data about individual?
Contains Indigenous Data
Does the data hold data about Indigenous communities?
Portal Type
Platform type of the source portal.
Field Value
Version
Version of the datatset
None
Source
Source of the dataset.
None
Version notes
Version notes about the dataset.
Is version of another dataset
Link to dataset that it is a version of.
Other versions
Link to datasets that are versions of it.
Provenance Text
Provenance Text of the data.
Conservation Ontario
Provenance URL
Provenance URL of the data.
Temporal resolution
Describes how granular the date/time data in the dataset is.
GeoSpatial resolution in meters
Describes how granular (in meters) geospatial data is in the dataset.
GeoSpatial resolution (in regions)
Describes how granular (in regions) geospatial data is in the dataset.
Field Value
Indigenous Community Permission
Who holds the Indigenous Community Permission. Who to contact regarding access to a dataset that has data about Indigenous communities.
Community Permission
Community permission (who gave permission).
The Indigenous communities the dataset is about
Indigenous communities from which data is derived.
Field Value
Number of data rows
If tabular dataset, total number of rows.
41430
Number of data columns
If tabular dataset, total number of unique columns.
4
Number of data cells
If tabular dataset, total number of cells with data.
165720
Number of data relations
If RDF dataset, total number of triples.
Number of entities
If RDF dataset, total number of entities.
Number of data properties
If RDF dataset, total number of unique properties used by the triples.
Data quality
Describes the quality of the data in the dataset.
Metric for data quality
A metric used to measure the quality of the data, such as missing values or invalid formats.

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