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.
![](/mediawiki/images/thumb/a/ae/Canada_elevation_model_20m.png/450px-Canada_elevation_model_20m.png)
![](/mediawiki/images/thumb/e/e1/Canada_elevation_model_resolution.png/450px-Canada_elevation_model_resolution.png)
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.