Canadian Elevation Models: Difference between revisions
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== Acknowledgement == | == Acknowledgement == | ||
* Natural Resources Canada (NRCan) and the public of Canada are thanked for producing these digital elevation datasets – and disseminating | * Natural Resources Canada (NRCan) and the public of Canada are thanked for producing these digital elevation datasets – and disseminating these in the public domain - and thus for aiding the development of renewable energy. | ||
== External Links == | == External Links == | ||
Revision as of 09:42, 8 August 2024
NOTE 2024-08-04: This dataset is currently being integrated with windPRO.
Introduction
The Canadian elevation models are digital elevation models (DEM’s) produced by Natural Resources Canada, NRCan. Currently, two Canadian DEM models are available from windPRO:
1. Canada MRDEM-DTM Elevation Model - 30m resolution - (MRDEM)
The Canadian Medium Resolution Digital Elevation Model (MRDEM-DTM), part of the CanElevation Series developed by Natural Resources Canada (NRCan), offers a spatial resolution of 30 meters. This dataset is a mosaic derived from two primary sources: the CopernicusDEM (TandemX mission) and the national high-resolution HRDEM (Airborne LiDAR) model. The elevation values in this DTM dataset represent the bare ground surface, excluding objects such as vegetation and man-made structures. For use in this model, NRCan resampled the HRDEM 1-meter data into a 30-meter grid resolution.
2. Canada CDEM Elevation Model - 0.75 arc-second [LEGACY] - (CDEM)
The Canadian elevation model in its 0.75-arc-second resolution is a digital elevation model (DEM’s) produced by Natural Resources Canada (NRCan). CDEM is mainly based on elevation contours and hydrographic data from NRCan's Geospatial Data Base at the scale of 1:50,000, or at other scales provided by other provinces and territories. Temporal coverage is 1945-2011. The source dataset holds different resolutions from 0.75-arc-second (below N69) to 3-arc-second (above N81). For consistency, windPRO always delivers the data with a 0.75 arc-second resolution - with the coarser tiles being resampled with a bi-linear algorithm.
Please consult the product-specifications (see links below) for more details.
Dataset Overview - MRDEM
- Spatial Coverage: Canada
- Resolution:
- 30 meters
- Data-type: Digital Terrain Model (DTM)
- Coordinate system:
- Horizontal: Canada Atlas Lambert NAD83 (CSRS) (EPSG:3979)
- Vertical: CGVD2013
- Version: This is version 1.0 of MRDEM (from 2024-02.28). EMD procured this dataset in august 2024.
- Vertical Accuracy: N/A
Dataset Overview - CDEM
- Spatial Coverage: Canada
- Resolution:
- In windPRO: 0.75 arc-second (approximately 25m)
- Source data: 0.75 arc-second resolution below N69, 3-arc-seconds north of N81, other areas are typically 1.4 arc-second resolution (see image to the right).
- Data-type: Digital Elevation Model (DEM)
- Coordinate system:
- Horizontal: Geographic WGS - NAD83 (EPSG:4617)
- Vertical: Canadian Height Reference System, 1928 (CGVD28)
- Version: This is version 1.1 of CDEM. EMD procured this dataset in august 2024.
- Vertical Accuracy: N/A
Usage Notes
- CDEM is a legacy DEM product that is no longer supported by the Natural Resources Canada as it may not meet current government standards. EMD recommends using MRDEM.
- If you need even higher-resolution data (down to 1m or 2m grid resolution), then NRCan also offers a High Resolution Digital Elevation Model (HRDEM) for selected regions and territories - see HERE. The complete coverage of the Canadian territory is gradually being established (2024).
Availability from within WindPRO
The data are available directly from within windPRO in 0.75-arc-second (~25-meter) resolution or 30m resolution. The data can be accessed from the online-services in the following objects:
- Line Object (with purpose to height contour lines)
- Elevation Grid Object
License and Attribution
These products belong to the open data of Natural Resources Canada (NRCan). The data have been licensed under an ‘Open Government Licence – Canada (version 2.0)' - see here. Please accept the license conditions and use a proper attribution when using these dataset, such as:
Canada digital elevation model (DEM) data from Natural Resources Canada (NRCan). License: Open Government Licence – Canada. Source: Distribution through EMD and windPRO.
Acknowledgement
- Natural Resources Canada (NRCan) and the public of Canada are thanked for producing these digital elevation datasets – and disseminating these in the public domain - and thus for aiding the development of renewable energy.