Weather files are getting "time shifted" by 8 hours from download script

Kyle_DeanCEI
Topic Author

25 Jan 2023 15:03 - 25 Jan 2023 15:44 #11868 by Kyle_DeanCEI

Weather files are getting "time shifted" by 8 hours from download script was created by Kyle_DeanCEI

Hello,

I am attempting to use a .LK script file to download a batch of NSRDB weather files given coordinate input. The script is largely copied from the example available to download from this site.

The timestamps do not make any sense on these files and appear to be timeshifted 8 hours forward. When I do a download of the same weather file from the SAM software interface, the file I get contains the same data but different time stamps. See attached screenshot for side-by-side of output weather files.

Last edit: 25 Jan 2023 15:44 by pgilman.

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pgilman

25 Jan 2023 15:46 #11869 by pgilman

Replied by pgilman on topic Weather files are getting "time shifted" by 8 hours from download script

Hi Kyle,

SAM expects time stamps to be in local time, so be sure to set the 'utc' parameter to false in your calls to the NSRDB API . Note that if you omit the 'utc' parameter, the API assumes a default value of true.

Best regards,
Paul.

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Kyle_DeanCEI
Topic Author

26 Jan 2023 08:29 #11873 by Kyle_DeanCEI

Replied by Kyle_DeanCEI on topic Weather files are getting "time shifted" by 8 hours from download script

Paul,

Thank you for the info. Can you tell me how / where in the script I should set the UTC parameter?

Thanks

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Kyle_DeanCEI
Topic Author

26 Jan 2023 09:19 #11874 by Kyle_DeanCEI

Replied by Kyle_DeanCEI on topic Weather files are getting "time shifted" by 8 hours from download script

Paul,

Never mind on the request, I was able to correct the issue by adding the bolded lines of code to the download script.

Code:

    // get download urls for all available versions, intervals, and years, create
    // file names for downloads
    for( i=0; i<#links; i++ )
    {
        if ( year == 'all' )
        {
            for ( j=0; j<#available_years; j++ )
            {
                if ( available_years[j] != 'all' )
                {
                    if ( (links[i].year == available_years[j]) && (links[i].interval == interval) )
                    {
                        if ( strpos(available_years[j], 't') > -1 ) { intvl = 60; } // tmy, tgy, or tdy
                        else { intvl = interval; }
                        url = links[i].link;
                        url = replace( url, 'yourapikey', api_key );
                        url = replace( url, 'youremail', api_email );
                       [b] url = url+'&utc=false';//add in UTC false parameter to download URL[/b]
                        wf.url[n] = url;
                        wf.fname[n] = path + '/nsrdb_' + site.name[s] + '_' + site.lat[s] + '_' + site.lon[s] + '_' + intvl + 'min_' + available_years[j] + '.csv';
                        n++;
                    }
                }    
            }    
        }
        elseif ( (links[i].year == year) && (links[i].interval == interval) )
        {
            url = links[i].link;
            url = replace( url, 'yourapikey', api_key );
            url = replace( url, 'youremail', api_email );
           [b] url = url+'&utc=false'; //add in UTC false parameter to URL[/b]
            wf.url[n] = url;
            wf.fname[n] = path + '/nsrdb_' + site.name[s] + '_' + site.lat[s] + '_' + site.lon[s] + '_' + interval + 'min_' + year + '.csv';
            n++;
        }
    }

Thanks for the advice.

Kyle D

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