View source for EMD-Global Wind Data (based on ERA-Interim)

[[Category:Online Data]][[Category:Wind Data]]
[[Image:EraInterim.png|right|300px|thumb|150 m wind speeds for a part of the ERA-Interim Domain]]
The "EMD-Global Wind Data (based on ERA-Interim)" is a global dataset processed by EMD with the purpose of providing a global dataset for use in wind farm projects. It contains wind data (speed and direction) as well as temperatures and pressures at typical wind turbine hub heights from 10 m to 200 m.

== Data Source ==
The "EMD-Global Wind Data (based on ERA-Interim)" dataset is derived and processed from the ERA-Interim dataset. The ERA-Interim data is a recent global reanalysis dataset from the European Centre for Medium-Range Weather Forecasts (ECMWF). The full ERA-Interim reanalysis dataset holds a variety of surface parameters for weather conditions as well as ocean-wave and land-surface conditions. A number of parameters describing the atmospheric conditions are also available. The dataset processed and provided by EMD covers a small processed subset, with focus on parameters relevant for wind-energy purposes. 

== Usage Notes: ==
* '''The  EMD-Global Wind Data (based on ERA-Interim) is discontinued at the end of 2019''': The last month with ERA-Interim data was august 2019 as ECMWF has discontinued this dataset and replaced it with the [[ERA5_(Gaussian_Grid)|ERA5 Data]] and [[ERA5(T)_Rectangular_Grid|ERA5T Data]]. EMD has ceased to update the EMD-ConWx data as the source data is not avaialble anymore. The [[EMD-WRF Europe+ (ERA5)]] dataset is already available as the natural, higher-quality successor for the EMD-ConWx dataset. Find more information [[EMD-WRF_Europe%2B|here]]. 
* The ERA-Interim dataset has been used as the basis of the European EMD-ConWx Meso Data dataset, which provides reanalyzed ERA-Interim data in an increased spatial resolution. See the details on that dataset [http://help.emd.dk/mediawiki/index.php?title=EMD-ConWx_Meso_Data_Europe here].

== Resolution, Coverage and Availability ==
* Spatial Resolution: The model grid available to external data-users is 0.702 degree latitude and 0.703 degree longitude. Coverage is global.
* Temporal Resolution: It holds four daily values in a period from 1979 until august 2019.

== Required Modules / Licenses ==
To access the ERA time series data the following modules are required within in your WindPRO licence:
* BASIS
* METEO
* MCP

Downloading of the data is unrestricted for licensed users, however a "fair use" policy applies.

== Data Processing and Dataset Parameters == 
EMD International has processed the raw ERA-Interim data by a simple, proprietary downscaling-procedure to provide the data at different physical heights covering 10 m - 200 m. Currently, the following parameters are available in the downloadable time series in WindPRO.

<center>
{| class="wikitable"
|+ align="bottom"|Table: Overview of EMD Dataset Parameters.
!Parameter
!Description
|-
|time 
|UTC time stamp (YYYY-MM-DD hh:mm)
|-
|wSpeed.x
|Wind speeds [m/s] at different physical levels (x).<br>Heights (x): 10m. 25m, 50m, 75m, 100m, 150m, 200m
|-
|wDir.x
|Wind directions [Deg] at different physical levels (x).<br>Heights (x): 10m. 25m, 50m, 75m, 100m, 150m, 200m
|-
|temp.x
|Temperatures [Deg C] at different physical levels (x).<br>Heights (x): 10m. 25m, 50m, 75m, 100m, 150m, 200m
|-
|pressure.x
|Pressures [hPa] at different physical levels (x).<br>Heights (x): 10m. 25m, 50m, 75m, 100m, 150m, 200m
|}
</center>

== References ==
An open-access journal paper is available. This paper by D.P.Dee ''et al.'', "The ERA-Interim reanalysis: configuration and performance of the data assimilation system" describes the dataset and configurations in more detail. Download your copy in pdf-format [http://onlinelibrary.wiley.com/doi/10.1002/qj.828/abstract here].

== External Links == 
* Homepage of ERA-Interim: [http://www.ecmwf.int/en/research/climate-reanalysis/era-interim http://www.ecmwf.int/en/research/climate-reanalysis/era-interim]
* Availability of ERA-Interim data: http://apps.ecmwf.int/datasets/data/interim-full-daily/

== Acknowledgement and License ==
''Credits'': The European Centre for Medium-Range Weather Forecasts for the ERA-Interim data.<br>
''License'': This data is distributed according to the license agreement for ECMWF archive products, [http://data-portal.ecmwf.int/data/d/license/interim/ see here].<br>
''Acknowledgement'': ECMWF requests that the origin of the ECMWF archive product (ERA-Interim) is acknowledged in any scientific publications arising out of the use of the products (see Section #5 in the ECMWF archive product license conditions).