Copernicus DEM: Difference between revisions
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** ''Absolute vertical accuracy:'' Less than 4m (90% linear error) | ** ''Absolute vertical accuracy:'' Less than 4m (90% linear error) | ||
** ''Relative vertical accuracy:'' Less than 2m for slope <20%. Less than 4m for slope >20%. | ** ''Relative vertical accuracy:'' Less than 2m for slope <20%. Less than 4m for slope >20%. | ||
* '''Absolute Horizontal accuracy:''' | * '''Absolute Horizontal accuracy:''' <6m (90% circular error) | ||
== Usage Notes == | == Usage Notes == | ||
Revision as of 20:43, 15 June 2021
Notification: CopernicusDEM is currently being integrated into windPRO 3.4 and 3.5.
Introduction
The Copernicus Digital Elevation Models (DEM) - or short Copernicus DEMs - is a set of DEM's with global coverage released from the European Space Agency (ESA). Two versions of these datasets are available to the general public: a global model at 90m resolution and a near-global model at 30m resolution.
Dataset Overview
- Spatial Coverage: Global for 90m data - and near-global for 30m data.
- Resolution: 30m (1-arc-second) and 90m (3-arc-second) grid resolution.
- Data-type: Digital Surface Model (DSM)
- Coordinate system (horizontal): Geographic WGS (EPSG:4326)
- Coordinate system (vertical): Earth Gravitational Model - EGM2008 geoid (EPSG: 3855)
- Version: WindPRO holds the 1.0 version of the NASADEM data
- Vertical Accuracy (according to product manual):
- Absolute vertical accuracy: Less than 4m (90% linear error)
- Relative vertical accuracy: Less than 2m for slope <20%. Less than 4m for slope >20%.
- Absolute Horizontal accuracy: <6m (90% circular error)
Usage Notes
- The spatial resolution of the raw Copernicus DEM is fixed in meters (30m or 90m), but the raw data-tiles are still stored with geographical coordinates. As such, the resolution in longitude-direction is varying with latitude. For the data in windPRO, all Copernicus DEM data has been resampled into a fixed resolution in decimal degrees using a bi-linear interpolation algorithm. The 30m dataset is stored with a global 1-arc-second resolution and the 90m dataset as a global 3-arc-second resolution.
- For the windPRO 30m Copernicus dataset, the missing (non-released) tiles have been patched with data from the 90m datase. These tiles have been resampled to the 30m grid resolution. A list of the affected tiles in Armenia and Azerbaijan is available here.
Availability from within windPRO
The DSM-data is available directly from within windPRO. The DSM elevation data is delivered as gridded data with a spatial resolution of 1 or 3 arc second. As a part of the processing of the DSM elevation data from our EMD server, the user has an option of choosing whether the data downloaded should be received as either raw gridded data or converted to height contour lines. In order to use the data for energy yield calculations, the data must be converted to contours. These data be accessed from the online-services in the following three objects:
- DSM-Data in the line object (with purpose to height contour lines)
- DSM-Data in the elevation grid object
Acknowledgement
The European Commission, the European Space Agency and the Copernicus team are acknowledged for the development and release of the free and open Copernicus data. We acknowledge the importance of releasing the Copernicus DEM's into the public domain and its contribution to improve modelling of the renewable energy sources - and wind energy in particular.
License
The 30m and 90m Copernicus DEM datasets are available as free datasets for the general public under the terms and conditions of the License found at this URL or here as pdf.