We have recorded some tutorials to help you learn how to use the Global Wind Atlas mapping interface. Additionally we have included descriptions of the Web Processing Services that can be used to plot various views of the atmospheric renalysis data and a sampling of the Global Wind Atlas data. These tools are functions that perform analysis on the Atlas data for a region of interest defined by the users.
Toggle Map Layers
Here you will learn how to add different layers to the map.
Draw analysis plots
Here you will learn about the different analysis plots made availible through the web interface.
Download .lib files
Here you will learn how to download .lib files to run your own WAsP simulation. You can download data from either the nearest point, or all libs enclosed within a polygon of interest.
Applying input data
To describe the broader wind conditions four of the tools use data from reanalysis models to show the temporal variability in the data as well as the predominant wind directions. Two reanalysis data are availible for plotting. MERRA data is availible on a 1/2 degree latitude by 2/3 degree longitude grid every 6 hours from 1979 - 2013. CFDDA data is availible on a global 0.4 degree grid hourly from 1985 - 2005.
Generalized wind climate downloader tool
The generalized wind climate data in the form of files in the WAsP libfile format can be downloaded. The data is derived from the reanalysis data and generalization method described in Chapter 4↑. In Table 7.1↓ the description of the WAsP libfile from the Global Wind Atlas is given.
Wind rose tool
The wind rose shows the aggregated frequency for twelve 30-degree sectors centered on the cardinal directions. This data is taken from the reanalysis data so the frequencies are based off the period of reporting for each.
Temporal Histogram tool
The temporal histogram shows the aggregated frequency for 1 m s-1 wind speed bins over the selected area. This data is taken from the reanalysis data so the frequencies are based off the period of reporting for each. However, it should be noted that the renalysis wind speeds are instantaneous values.
Annual and Daily cycle tools
The annual and diurnal cycle plots show the area averaged wind speeds for each month of the year and hour of the day respectively. The y-axis shows the period wind speed divided by the mean wind speed for the entire period. The circles show the mean of the period, while the shadded region shows +/- two standard deviations of the data. Due to the MERRA data only being availible every 6 hours a diurnal cycle plot is not availible for this dataset.
Reanalysis identification string ix and iy index values for the calculation point in the GWA job tile < coordinates > lon_string,lat_string,0.0 < /coordinates >
Number of roughness classes, heights and sectors in data set. In GWA the values are 5,3,12
Reference roughness lengths [m]. In GWA the values are: 0.0, 0.03, 0.10 and 0.40, 1.5 m
Reference heights above ground level [m]. In GWA the values are: 50, 100 and 200 m a.g.l.
Frequencies of occurrence for reference roughness 1 (0 m)
Weibull A-parameters for reference height 1 (50 m) in [ms-1]
Weibull k-parameters for reference height 1 (50 m)
Weibull A- and k-parameters for reference height 2 (100 m)
Weibull A- and k-parameters for reference height 3 (200 m)
As lines 5-9, but for reference roughness 2 (0.03 m)
As lines 5-9, but for reference roughness 3 (0.10 m)
As lines 5-9, but for reference roughness 4 (0.40 m)
As lines 5-9, but for reference roughness 5 (1.50 m)
Generalized wind climate data in WAsP lib-file format.
Applying full calculation output data
The tools below use the full calculation output data sampled at 1000 m spacing.
Area wind speed and power density plot
This chart shows the mean wind speed (y-axis) for the windiest percent area (x-axis) of the selected area. This shows the windiest sites in many cases are significantly windier than the average for the region of interest. When showing power density this effect is stronger, and the windiest sites can lift the mean power density for the whole region of interest significantly.
Areal Histogram tool
This chart shows the percentage (y-axis) of the selected area which has a mean wind speed in a given interval (x-axis).