Hi Tom,

Is there a creative way that one could make a text file with the data? I'm 
trying to figure out how to make a csv file with the last 5 years worth of 
data.

Output CSV something like aggregate 1hr averages for outTemp
Date, outTemp.0, outTemp.1, outTemp.2, outTemp.3, outTemp.4
Date1, outTempcurrentyear, outTempyearN-1, outTempyearN-2, outTempyearN-3, 
outTempyearN-4
Date2, outTempcurrentyear, outTempyearN-1, outTempyearN-2, outTempyearN-3, 
outTempyearN-4
...
Date365, outTempcurrentyear, outTempyearN-1, outTempyearN-2, 
outTempyearN-3, outTempyearN-4

This can then easily be plugged into javascript to then graph on the same 
axis. 

I can get 5 years worth of data our using either:

#for $_span in $span($year_delta=5).spans(interval=3600)
$_span.outTemp.avg.formatted, 
#end for

<br>
{test aggregation 1 year ago}
#for $_span in $year($years_ago=5).spans(interval=3600)
$_span.outTemp.avg.formatted, 
#end for

Having a hard time coming up with a loop structure that would allow the 
desired output and would love any ideas on how to aggregate and loop 
through the data to accomplish this.

-Geoff


On Thursday, February 9, 2017 at 6:39:53 PM UTC-8, Tom Keffer wrote:
>
> Unfortunately, neither of those are possible with the present image 
> generation engine.
>
> You could run wee_reports, using a timestamp of a year ago, saving the 
> images to a separate spot. Then you would be able to display this month's 
> graph, and the same month a year ago. But, they would be in separate graphs.
>
> -tk
>
> On Thu, Feb 9, 2017 at 3:54 PM, Thomas Carlin <thomas...@gmail.com 
> <javascript:>> wrote:
>
>> I have a couple questions about image generation that doesn't seem to be 
>> covered in the docs anywhere.
>>
>> I would like to be able to create images with the same data value, but 
>> from multiple time ranges. For the yearly say, have the last 365 days as 
>> one line, but then have another line that has the same date range, but from 
>> 1 year ago.  Is something like this possible with the current image 
>> generator?
>>
>> I would also like to be able to generate historic graphs.  Is there a way 
>> to do this historically, and moving forward, so next year I can look at 
>> this February's graph?
>>
>> Thank you!
>>
>> My station can be seen here:  http://carlincomputing.duckdns.org/weewx/
>>
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