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WindRose>> A software for wind data analysis.
   

Questions & Answers

1. Why do I get a security warning when I open WindRose.xls(m) ?

When opening WindRose.xls(m)file, Excel displays a security warning, asking whether or not to enable WindRose's macros. The software will run in both cases, but functionality is reduced with macros disabled.

If you want to avoid permanently Excel's security warnings (when opening the WindRose.xls file), check the following links depending on the Excel version you use: 2003, 2007, 2010.

2. WindRose menu does not appear in the 64bit version of Office 2010.

WindRose's installation completes successfully but the WindRose menu does not appear in Excel. This occurs only in the 64bit version of MS-Office 2010 (because of this Microsoft's bug) and a workaround is currently investigated. However, WindRose runs OK in both 32bit and 64bit Windows.

3. How can I process data files coming from a data-logger with wrong coefficients?

WindRose accepts a linear correction (y=a·x+b) for all channels (Table 3, Input Sheet). If no values are given there, it is assumed that a=1.0 and b=0.

Now, assume that (a0, b0) are the wrong coefficients with whom the data files were created, instead of the correct ones (a1, b1). Then, the following correction coefficients (a2, b2) should be entered in the Table 3 of the Input sheet, in order to produce correct results:

a2 = a1 / a0  and  b2 = b1 - b0 · (a1 / a0)

In case you have multiple anemometers but not all of them have wrong coefficients, then when setting the correction coefficients, remember to set a=1.0 and b=0.0 for the rest ones. Example: if you have 3 anemometers and the correct coefficients for the 2nd one are: (1.003, -0.38) then you should write: 1.0;1.003;1.0 (multiplier) and 0.0;-0.38;0.0 (offset).

4. When setting correction coefficients and the 1st value is negative, then Excel does not accept the cell value.

Assume you have 2 vanes and their "north" should be corrected by -15° and . When setting the correction offset you should put either an apostrophe (') in front of the; '-15;8 (denoting to Excel that this is a text cell) or format the cell as a text, before writing -15;8.

5. Can I convert my 1sec (or 1min) wind data to 10min average data?

There is an undocumented feature that solve this. If your data have a time step <10min (1sec, 30sec, 1min,...), then WindRose produces automatically a 10minAve.txt file at the end of a run. However, note the following:

1. It is suggested to process data chunks (1-2 months) as WindRose allocates huge memory buffers, and you risk to obtain either an "Out of memory" message or an Excel crash.

2. For 1sec data most probably you will not have a Usdv column. In that case, just set as Usdv column the same column as U, because WindRose needs at least 5 colums to run (U,Dir,Usdv,Time, Date). The created 10minAve.txt file will contain the correct 10min based Usdv values.