The Faroe Island has a wrong timezone #32
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Hey Tim,
Can you unsubscribe me from this please? I no longer have access to GitHub and have since retired.
Best regards,
Steve
Stephen C. Andrews
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From: jidesoft <[email protected]>
Reply-To: drtimcooper/LatLongToTimezone <[email protected]>
Date: Tuesday, August 20, 2019 at 10:57 AM
To: drtimcooper/LatLongToTimezone <[email protected]>
Cc: Subscribed <[email protected]>
Subject: [drtimcooper/LatLongToTimezone] The Faroe Island has a wrong timezone (#32)
I can try to fix it myself if you guys can show me the steps. I saw Faroe has a separate shape in the shp file, but it maps to a wrong timezone name.
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I don't think the problem is resolved but there's no-one around who cares enough to fix it. |
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:-( I care, and the Faroeses and people who travel to the Faroe Islands care. You should care too as it indicates some fundamental issues in the generated code. From what I can see the shapefile is correct yet the timezone is still wrong. |
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Okay, apologies for my rude comment. I didn't realise this was a fairly recently created issue. Actually I have never been to the Faroes but have read the Faroese saga twice (Thrand, Sigurd, Sigmund et al). Anyway, if this is a data bug then it'll be easy to fix, but if it's an algorithm bug then it'll be very difficult to fix. From your Aug 21 comment it sounds like a data bug. Would you be willing to attempt a fix? There is no automated process for updating the .shp file. You could hunt around for the most recent authoritative version of it, (and hopefully Crimea is in the Russian timezone there), check that the Faroes are correct in that version, chase it up with the producers if not, and/or do a manual fixup, and regenerate the various target files. |
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Thank you. My debug shows it returns a wrong timezone index at one of the if statement. How do you associate the .shp file with the timezone? Can you check the .shp has a separate region for Faroe Island?I loaded it into Google Earth and saw it is, but I am not sure how you associate the .shp with the timezone. |
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Hi Jidesoft:
One approach would be to hack your .java source file at the point where you can see it returns the wrong value. I think you need to return 362 or something for “Atlantic/Faroe”.
The next step would be to hack the “timezone.json” file – find the relevant polygon and modify the associated timezone string.
Going another step back up the pipeline, confirm that the currently committed version of the .shp file (which is processed into “timezone.json”) has the wrong data and find out who made it and get them to fix it, and then do all the processing again.
From: jidesoft <[email protected]>
Sent: Friday, 25 October 2019 1:43 AM
To: drtimcooper/LatLongToTimezone <[email protected]>
Cc: Tim Cooper <[email protected]>; State change <[email protected]>
Subject: Re: [drtimcooper/LatLongToTimezone] The Faroe Island has a wrong timezone (#32)
Thank you. My debug shows it returns a wrong timezone index at one of the if statement. How do you associate the .shp file with the timezone? Can you check the .shp has a separate region for Faroe Island?I loaded it into Google Earth and saw it is, but I am not sure how you associate the .shp with the timezone.
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Thanks for the info. After I debug, I found the problem is at
else if (lat < 66.536849f)
return 211;
else
return 299;
299 is Faroe timezone string. Faroe Islands is below 63N. I changed < to >=, it works.
else if (lat >= 66.536849f)
return 211;
else
return 299;
But I am not sure how it goes back to timezone.json.
Thanks,
…-David
From: Tim Cooper <[email protected]>
Sent: Thursday, October 24, 2019 11:40 PM
To: drtimcooper/LatLongToTimezone <[email protected]>
Cc: jidesoft <[email protected]>; Author <[email protected]>
Subject: Re: [drtimcooper/LatLongToTimezone] The Faroe Island has a wrong timezone (#32)
Hi Jidesoft:
One approach would be to hack your .java source file at the point where you can see it returns the wrong value. I think you need to return 362 or something for “Atlantic/Faroe”.
The next step would be to hack the “timezone.json” file – find the relevant polygon and modify the associated timezone string.
Going another step back up the pipeline, confirm that the currently committed version of the .shp file (which is processed into “timezone.json”) has the wrong data and find out who made it and get them to fix it, and then do all the processing again.
From: jidesoft <[email protected] <mailto:[email protected]> >
Sent: Friday, 25 October 2019 1:43 AM
To: drtimcooper/LatLongToTimezone <[email protected] <mailto:[email protected]> >
Cc: Tim Cooper <[email protected] <mailto:[email protected]> >; State change <[email protected] <mailto:[email protected]> >
Subject: Re: [drtimcooper/LatLongToTimezone] The Faroe Island has a wrong timezone (#32)
Thank you. My debug shows it returns a wrong timezone index at one of the if statement. How do you associate the .shp file with the timezone? Can you check the .shp has a separate region for Faroe Island?I loaded it into Google Earth and saw it is, but I am not sure how you associate the .shp with the timezone.
—
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I don’t know if this change will break something else for you…I don’t know what timezone lies above the Faroes….probably nothing much.
Anyway, if you’re happy with this change then my advice is to make it locally, and keep it, and never upgrade. The timezone polygons are extremely stable…moreso than the timezone offsets. And my tool only maps lat/longs to timezone identifiers, so your local libraries (I forget which platform you’re using) will take care of mapping (timezone identifier, time) --> GMT offset.
From: jidesoft <[email protected]>
Sent: Friday, 25 October 2019 10:19 PM
To: drtimcooper/LatLongToTimezone <[email protected]>
Cc: Tim Cooper <[email protected]>; State change <[email protected]>
Subject: Re: [drtimcooper/LatLongToTimezone] The Faroe Island has a wrong timezone (#32)
Thanks for the info. After I debug, I found the problem is at
else if (lat < 66.536849f)
return 211;
else
return 299;
299 is Faroe timezone string. Faroe Islands is below 63N. I changed < to >=, it works.
else if (lat >= 66.536849f)
return 211;
else
return 299;
But I am not sure how it goes back to timezone.json.
Thanks,
…-David
From: Tim Cooper <[email protected] <mailto:[email protected]> >
Sent: Thursday, October 24, 2019 11:40 PM
To: drtimcooper/LatLongToTimezone <[email protected] <mailto:[email protected]> >
Cc: jidesoft <[email protected] <mailto:[email protected]> >; Author <[email protected] <mailto:[email protected]> >
Subject: Re: [drtimcooper/LatLongToTimezone] The Faroe Island has a wrong timezone (#32)
Hi Jidesoft:
One approach would be to hack your .java source file at the point where you can see it returns the wrong value. I think you need to return 362 or something for “Atlantic/Faroe”.
The next step would be to hack the “timezone.json” file – find the relevant polygon and modify the associated timezone string.
Going another step back up the pipeline, confirm that the currently committed version of the .shp file (which is processed into “timezone.json”) has the wrong data and find out who made it and get them to fix it, and then do all the processing again.
From: jidesoft <[email protected] <mailto:[email protected]%20%3cmailto:[email protected]> <mailto:[email protected]> >
Sent: Friday, 25 October 2019 1:43 AM
To: drtimcooper/LatLongToTimezone <[email protected] <mailto:[email protected]%20%3cmailto:[email protected]> <mailto:[email protected]> >
Cc: Tim Cooper <[email protected] <mailto:[email protected]%20%3cmailto:[email protected]> <mailto:[email protected]> >; State change <[email protected] <mailto:[email protected]%20%3cmailto:[email protected]> <mailto:[email protected]> >
Subject: Re: [drtimcooper/LatLongToTimezone] The Faroe Island has a wrong timezone (#32)
Thank you. My debug shows it returns a wrong timezone index at one of the if statement. How do you associate the .shp file with the timezone? Can you check the .shp has a separate region for Faroe Island?I loaded it into Google Earth and saw it is, but I am not sure how you associate the .shp with the timezone.
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I can try to fix it myself if you guys can show me the steps. I saw Faroe has a separate shape in the shp file, but it maps to a wrong timezone name.
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