Using a network drive as the raw data folder adds to the processing time because it takes longer to read files from a network location.

When processing .ghg files, the EddyPro interface loads the first file in the folder when you select the raw data folder. It uses the metadata for that file to set up processing. When data processing starts, the processing engine uses that information for subsequent files. Data processing proceeds until the file format or structure changes (i.e., different number of variables or variables in different order), at which point there is a mismatch between the metadata and the data file and EddyPro fails to process that file. The solution is to processes files with different data format or structures separately by putting the raw data files into a separate folder.

Processing data from biomet sensors along with high-speed wind and gas data is accomplished either by using a data file included in the .ghg file or by adding data contained in external text files. External text files must have properly formatted time stamp information so that EddyPro can match it to the fast wind and gas data. Most errors in processing such files arise because of problems with the timestamp formatting.

Errors may arise from an improper number of characters or unacceptable formatting in the time stamp fields of external biomet files. Here are several examples and solutions:

Example 1: This file has incorrect formatting in the day-of-year, hour, and minute columns. All values in the day-of-year column should have three characters. Some have only two. The same applies to the hour and minute fields, which have one or two characters instead of the required two.

Example 2: This file shows automatic formatting done by Excel® for the first timestamp that contains the date. It also shows the same issue from Example 1 in the hour/minute column.

Solutions:

1. With the files open in Excel, configure the date formatting.
2. Select the column that needs to be corrected. Right click and select Format Cells.
3. 
3. To correct the date formatting, click Custom. Under Type, enter yyyy-mm-dd.
4. 
4. To correct day of year, select the column and open Format Cells. Select Custom and enter 000 to specify three-digit day of year.
5. 
5. To correct hour and minute, select the column and open Format Cells. Select Custom and enter 0000 to specify four-digit time.
6. 
6. Click OK and save the file in its original format.

Repeat this for other files to correct run failures and time stamp issues.

EddyPro makes the determination of daytime and nighttime based on the following inputs and/or calculations.

1. If the data file or the Biomet data contains global radiation measurements it will consider the flux averaging interval with global radiation value greater than 12 Watts m^-2 to be daytime.
2. If the data doesn’t contain global radiation but PPFD (PAR) then EddyPro will consider the flux averaging interval with PPFD value greater than 100 µmol sec^-1 m^-2 to be daytime.
3. If both global radiation and PPFD are not available, then EddyPro computes the potential radiation based on the latitude and longitude provided in the metadata. If this value is greater than 10 watts m^-2, then that half hour is considered daytime.
4. If there is no latitude then the time stamp information is used to determine daytime.

Each version of the EddyPro application includes full documentation as part of the application. To open the embedded documentation, click the Help menu and select Use Offline Help. Now the instruction manual (.pdf) and help will be opened from the EddyPro installation files.