a quick way is to delete all the .png files and let weewx regenerate them

On Friday, 13 April 2018 19:04:33 UTC+3, dhin...@djhindley.com wrote:

> I have successfully imported my 2018 data and the statistics all reconcile 
> with my own analysis of the same data, so looks a good start.  However, the 
> weewx charts don't show the historical data at all. How do I get them to do 
> this, please?
> On Friday, 13 April 2018 09:22:49 UTC+1, dhin...@djhindley.com wrote:
>> Gary
>> Many Thanks for your very helpful reply.  So which setting do I use for 
>> the archive interval in the config file? "derive" seems the most logical, 
>> but the instructions say that "derive" is suitable when the data was 
>> recorded at fixed intervals.
>> I do have some gaps in my data - up to two weeks in some cases.  I plan 
>> to try to fill as many of these gaps as possible using a combination of 
>> downloaded data from weathercloud (for my weather station) and also using 
>> the Met office's 5km grid data as a suitable proxy (for the grid containing 
>> my PWS).  I will attempt to process this all into a single archive database 
>> using R software and then use weewx import. If I need to take up your kind 
>> offer of a Weatherlink import module, I will let you know.
>> David.
>> On Friday, 13 April 2018 02:37:20 UTC+1, gjr80 wrote:
>>> David,
>>> Variable archive intervals have been supported since weeWX v3.0.0, 
>>> though I believe there was a display/report calculation bug that was 
>>> addressed in 3.7.0 (of course we are all running 3.8.0 so neither of these 
>>> should be an issue :))
>>> One thing to be mindful of when using wee_import to import data is that 
>>> when you are deriving the archive interval from the source data (ie finding 
>>> the difference between successive timestamps) missing records can skew this 
>>> significantly. A single missing record in a data set with an interval of 5 
>>> minutes will likely have negligible effect but if you have several hours or 
>>> days missing it may be a different matter. For this reason when importing 
>>> from WeatherUnderground if your WeatherUndergroud data was posted every 10 
>>> minutes it is quite often handy to force wee_import to use a 10 minute 
>>> archive interval as WeatherUnderground often does not return all available 
>>> data, plus it is not unusual for users to have large gaps in their 
>>> WeatherUnderground data.
>>> If you have a changing archive interval in your data and are concerned 
>>> about data gaps, it might be useful to break the import down into smaller 
>>> chunks that use a single archive interval and import that data with a set 
>>> rather derived interval.
>>> Gary
>>> PS. If there is significant reformatting required to import the 
>>> ex-WeatherLink data I am happy to put together a WeatherLink module for 
>>> wee_import, I will just need to know the data format. Only thing is it will 
>>> take time for me to put the module together, though I guess your old data 
>>> is not going anywhere :)
>>> On Friday, 13 April 2018 01:16:54 UTC+10, Andrew Milner wrote:
>>>> As far as I know the latest version of weewx casn handle variable 
>>>> intervals- so just let wee_import derive the interval from the time 
>>>> stamps* 
>>>> should* work (I think!!)
>>>> someone more knowledgeable maywish to comment ....
>>>> On Thursday, 12 April 2018 17:59:03 UTC+3, dhin...@djhindley.com wrote:
>>>>> The import facility looks like the right way to go - but unfortunately 
>>>>> my source data has variable archive intervals. Is there any way of 
>>>>> dealing 
>>>>> with this in the weewx import utlility, or is it best to convert all the 
>>>>> source data to have the same archive interval (painful!)?
>>>>> Thanks.
>>>>> On Wednesday, 11 April 2018 17:45:19 UTC+1, dhin...@djhindley.com 
>>>>> wrote:
>>>>>> Hi
>>>>>> I have just started using weewx on a Raspberry Pi with a Davis 
>>>>>> Vantage using Weatherlink IP. The weather station has been running for 2 
>>>>>> years, but I only got weewx working from today. All is working fine, 
>>>>>> except 
>>>>>> that since I updated my archive record to 5mins immediately prior to the 
>>>>>> installation, weewx only shows the recent records. Does anyone know if 
>>>>>> there is a way I can manually add the historical data to the weewx 
>>>>>> database, so that the full history is shown on my weewx webpage? 
>>>>>> Thanks

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