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Welcome to the WASA FAQ
This is a list of Frequently-Asked Questions about the Wind Atlas of
South Africa (WASA). It has answers to most of the common
questions asked.
The Campbell Scientific CR1 program will not be made available. Please refer to the datalogger manual for details about the measuring methods and accuracy. http://www.campbellsci.com/documents/manuals/cr1000.pdf . The sample rate is chosen to be one Hz and every 10 minute statistics of the measurements are calculated and recorded together with time information. Return to top 2. Are the data available on the website “raw” or have they been subjected to some data processing and cleaning? We would ideally like the raw data to be able to do our own data processing/cleaning, thus ensuring traceability. Failing this, will a description of the post-processing for each mast be made available? The raw data will not be made available. However we do store both raw and calibrated data in the database ensuring traceability. The raw data is in Hz, mV etc. The only post processing done is applying the calibrations constants from the calibration certificates (these can be obtianed upon request from Eric Prinsloo or Ursula von St Ange) of each sensor, thus transforming the values into m/s, degrees etc. Every month before the data can be downloaded from the download site it goes through a quality control process. If any measurement is considered faulty the calibrated values are null’ed in the database and thereby also in the data files, however the measurement of relative humidity is reduced to a fixed value of 100% for any measurement value that might occur exceeding 100% as recommended by the instrument supplier. The monthly data quality report will be made available for download on the web site. Return to top 3. Is the plan to keep all the historic data on the website, or will only the most recent data be available for download? The plan is that all the data collected will be available from the download site at least as long as the Wind Atlas project is running (i.e. at least until June 2013). Return to top |