Q. What is a sufficient time period for the measured data?
A. Time-series of wind data should cover at least one year, but preferably several years. An integer number of whole years should be used in order to avoid seasonal bias. As an example, a series covering April 1st 1988 to September 30th 1990 should be truncated to April 1st 1988 to March 31st 1990, or October 1st 1988 to September 30th 1990, the exact period depending on the data recovery and data quality in general.
Q. What is the max. number of data points in a time-series I can input to the Climate Analyst or OWC Wizard?
A. There is no limit.
Q. Can I use measured data (time-series) from more than one met. station to define a regional wind climate (wind atlas)?
A. WAsP does not allow more than one met. station (anemometer) to define a Regional Wind Climate (RWC or Wind Atlas). In case you have more than one met. station we normally recommend to use the extra data to make a comparative prediction − and, optionally, adjust relevant modelling parameters within reasonable limits to obtain similar results. See Cross predictions for details. An alternative way is to use the RWC based on one met. station to make a prediction for the other station(s) and compare with the OWC of these. The modelling parameters to adjust could e.g. be:
* terrain description (e.g. roughness values in digital map or roughness roses), and
* the heat flux values used to evaluate stability effects (project modelling parameters).
Even after the above mentioned adjustments it may be necessary to interpolate between the resulting RWCs. Interpolation between two or three RWCs may be performed by the LIBINT software contained in the WAsP Utility Programs Package (see Interpolation of wind atlas data sets ).