Frequently Asked Questions (FAQs) with answers

Environmental Forum Forums EddyPro Frequently Asked Questions (FAQs) with answers

This topic contains 13 replies, has 5 voices, and was last updated by  IsraelB 6 years, 8 months ago.

Viewing 14 posts - 1 through 14 (of 14 total)
  • Author
    Posts
  • #1380

    IsraelB
    Keymaster

    We intend to continuously update this topic with some of the commonly asked questions and their answers.

    #1553

    IsraelB
    Keymaster

    Question: Can EddyPro calculate fluxes from partially calculated half hourly data such as the files from a Campbell Scientific data logger online flux program.

    Answer:

    EddyPro is intended for computing fluxes and applying all the necessary corrections and quality flagging to the raw high frequency data. These files are typically collected at 10Hz or 20Hz. These files can be used in EddyPro whether they come from a LI-COR LI-7550 or any other data logging system. The half hourly preliminary fluxes or covariances outputted from online logger programs are not suitable to be used with EddyPro.

    #1551

    IsraelB
    Keymaster

    Question: Can I process a file that contains several (x) hours of data in EddyPro?

    Answer:

    EddyPro can process several years of data however EddyPro puts a limit on the amount of data a single file can contain to optimize the memory management. The limits are as follows

    EddyPro Express (Version 2.3.0) – can process files that contain up to 4 hours of 10 Hz data

    EddyPro Advanced (Version 3.0.0 or higher) – can process files that contain up to 48 hours of 10 Hz data.

    Therefore if you have a file that contains more than the above mentioned duration of data you can split it into smaller durations and process using EddyPro.

    #1557

    IsraelB
    Keymaster

    Question: Where can I find support and help on EddyPro?

    Answer:

    EddyPro includes integrated help inside the software. There are two options, local help and online help. The local help pulls up the help files downloaded with the software in your internet browser. You can also get a PDF copy of the file.

    The online help is kept at the following link:

    http://envsupport.licor.com/help/EddyPro3/Content/Topics/Introduction.htm

    This forum is another source for answers regarding EddyPro.

    You can also contact LI-COR for support requests.

    #1567

    ipechmann
    Participant

    Hi,

    I am new to the site and not sure if I am posting my question to the right place.

    Anyhow, I’ve just started using the 3.0 version.

    When processing the files it keeps giving me an error message related to labeling the data records. However I haven’t labeled them, what’s more I can’t evdn find the “Label of Data Records” option under Raw File Description so I could make sure there’s no label(s) defined.

    It’s in the 2.3 version but just can’t find it in the 3.0 version

    Any help would be appreciated

    thanks

    Ildiko

    #1568

    Jiahong
    Participant

    Hi Ildiko:

    Welcome to EddyPro Forum.

    The ‘Label of data records’ is used in files that use a label to separate ‘data’ record/lines from status or other information lines in the record. For example:

    o DATA … data values….

    o DATA … data values….

    o DATA … data values….

    o STATUS…status values….

    o DATA … data values….

    o DATA … data values….

    o STATUS…status values….

    If your data is organized in this fashion, ‘DATA’ would be your ‘Label of data records’. LI-COR instruments usually use this type of file system. However, we did not see many files using this feature so we decided to remove it from the user interface and handle it automatically through embedded metadata for LI-COR GHG files.

    If your data contain a similar structure, you can still enter this value but you have to do it manually. Locate the metadata file on your computer and open it using Notepad or WordPad. Search for “data_label”.

    If your file is similar to the one above, then type in:

    data_label=DATA

    If you do not have any data labels regardless of your file format such as ASCII and TOB1, type in:

    data_label=Not set

    This should fix the error.

    Let us know if you have more problems.

    #1569

    ipechmann
    Participant

    Hi Jiahong,

    thank you for the advise. I checked the metadata file, data label=not set. But I am still getting the same error i.e warning(10008): left samples (if any) not enough for an averaging period. Skipping to next file(s).

    I am using TOA5 files generated by LI-75000. It’s 20Hz data and it’s seems to me, that the files themself are somehow corrupted though when opening them in excel I don’t see any issue.

    thank you for helping

    Ildiko

    #1570

    IsraelB
    Keymaster

    Ildiko,

    Do you have any non numeric columns in your data? EddyPro reads data with non-numeric columns such as time stamps with ‘:’ or date with ‘/’ or ‘-‘ differently from a file that has all numeric data. EddyPro needs to know if there is a non numeric field even if you are not using it for computation (‘ignoring’ it). Otherwise each column will not be read correctly and may lead to the error you are seeing.

    It may help to send a sample data file, your metadata and your project file to envsupport@licor.com for further troubleshooting.

    #1571

    IsraelB
    Keymaster

    Updated

    I was missing a ‘t’ in the email address. Sorry. Send the email to envsupport@licor.com

    #1572

    ipechmann
    Participant

    Thank you for the tip.

    It worked.

    It seems that the wind data is somehow corrupted. I’ll take you’re advice and send it over.

    Thank you for taking time to help me out.

    Ildiko

    #1579

    TimL
    Participant

    Hi,

    I’m at a point that I have my raw data ready to pass through EddyPro to compare it our in-house process. Initially, I only did this for a couple months worth of data and it worked fine. Now that I’m trying to work on the complete history, I get the following error;

    At line 99 of file: filelist_by_ext.f90

    Fortran runtime error: Index ‘18001’ of dimension 1 of array ‘tmpfilelist’ above upper bound of 18000

    I’ve found this code mentioned here; http://envsupport.licor.com/help/EddyPro3/Content/Topics/Error_Codes.htm

    However, I cannot find the means to overcome this problem.

    #1581

    gerardo
    Participant

    Hello Tim,

    You have just spotted a bug! The maximum number of files that can be processed in one session by EddyPro is 18000 (corresponding to a bit more than 1 year of 30-min raw data). However, rather than crashing as it did, the software should have informed you about it and possibly start processing your first 18000 files.

    In a future release we will possibly increase that maximum limit (which as something to do with the same memory allocation issue I described in your other post).

    Thanks,

    Gerardo

    #1583

    TimL
    Participant

    Thanks Gerardo! I’ve replied in the other post (sorry for the mix-up). Personally, I think the file size shouldn’t be much of an issue. As I collect my card once a month, the file I had is 2GB. It’s not a very user friendly size. Converting them into 30min chunks actually makes more sense.

    #1646

    IsraelB
    Keymaster

    Question: Which temperature value does EddyPro use for flux computation?

    Answer:

    1) For calculating variances and covariances (including fluxes, WPL etc.) EddyPro uses the user’s selection of any among the available “sonic temperature” or “fast ambient temperature” data columns. For non-GHG files, it is the user’s responsibility to define a data column as a “fast temperature” or not, and then to use it or not for fluxes. For GHG files, there is no risk of mistake on this point.

    2) For calculating mean ambient temperature for any other purpose (spectroscopic correction, WPL, and so much more), EddyPro uses the first available value among (and strictly in this order): the mean value of the “ambient temperature” measurement selected by the user (which itself can be a biomet variable or for example a temperature reading from the LI-7700); the mean value of sonic temperature corrected for humidity or the mean value of the “fast ambient temperature” measurement, as selected by the user; a closed-path cell temperature if any is available. It is to be noted that the software will never get to use the “closed-path cell temperature” because if no sonic temperature and no “fast temperature” is selected, the run simply doesn’t start.

Viewing 14 posts - 1 through 14 (of 14 total)

You must be logged in to reply to this topic.

Comments are closed.