Topic: Growing Degree Days

[ryanprel]

Does anyone know of a way of automatically calculating growing degree days (GDD's) from the WS-1001 stations?  Either through a standard Weather Underground setup or using a different template/server.  I don't see anywhere that it's capable although I know of a few sites where it can be calculated via your zip code.  I'd like to try and calculate for my site and compare with the zip code to see what type of micro-climate my site has. 

[lrosenman]

Is there a formula somewhere?  If so, we can do that.....

[Sparky]

Google growing degree days.  You will find a LOT of information.

Good luck

[ryanprel]

http://agron-www.agron.iastate.edu/Courses/agron212/Calculations/GDD.htm

Here's some good info on examples and the equations.

For the agriculture realm, GDD's are one of the most important components of weather.  I think the Davis stations might show it but there's no reason it couldn't be automatically calculated and shown in the WS-1001.

[lrosenman]

http://agron-www.agron.iastate.edu/Courses/agron212/Calculations/GDD.htm

Here's some good info on examples and the equations.

For the agriculture realm, GDD's are one of the most important components of weather.  I think the Davis stations might show it but there's no reason it couldn't be automatically calculated and shown in the WS-1001.

I'll put together something tonight from the database I generate. 

[lrosenman]

http://agron-www.agron.iastate.edu/Courses/agron212/Calculations/GDD.htm

Here's some good info on examples and the equations.

For the agriculture realm, GDD's are one of the most important components of weather.  I think the Davis stations might show it but there's no reason it couldn't be automatically calculated and shown in the WS-1001.

I'll put together something tonight from the database I generate.

@ryanprel: That page seems to say it's dependent on the organism.  What base and limits do you want to see?

[ryanprel]

I'm specifically looking for grapes.  Looks like most crops use a 10c base temp, but there are some other base numbers.  The Wikipedia link below provides some of the different base numbers.

Here's a bit more information:
https://en.wikipedia.org/wiki/Growing_degree-day
http://msue.anr.msu.edu/topic/grapes/weather_climate/how_to_use_gdds
http://wine.wsu.edu/research-extension/weather/growing-degree-days/

[lrosenman]

I'm specifically looking for grapes.  Looks like most crops use a 10c base temp, but there are some other base numbers.  The Wikipedia link below provides some of the different base numbers.

Here's a bit more information:
https://en.wikipedia.org/wiki/Growing_degree-day
http://msue.anr.msu.edu/topic/grapes/weather_climate/how_to_use_gdds
http://wine.wsu.edu/research-extension/weather/growing-degree-days/

Does this look reasonable?

weather=# select max(outsidetemp),min(outsidetemp),(((max(outsidetemp)+min(outsidetemp))/2)-50)::numeric(5,2) as "GDD" from observations where timeutc between '2016-05-02 00:00:00' and '2016-05-03 00:00:00';
  max  |  min  |  GDD
-------+-------+-------
 67.10 | 55.80 | 11.45
(1 row)

[ryanprel]

Yeah, looks like that would work.  Thank you!

[lrosenman]

Yeah, looks like that would work.  Thank you!

That depends on my mods to weatherist34's script to log the data to a PostgreSQL database.

Do you have his stuff (that's intercepting the WS-1001's Wunderground POST's)?

If so, I can send you my schema, and the scripts.

I assume you have PostgreSQL?

[ryanprel]

I don't have weatherist34's setup working yet - was just looking at it yesterday.  The server I have runs Apache/Mysql and will be setup at http://weather.vinesandrushes.com

[lrosenman]

I don't have weatherist34's setup working yet - was just looking at it yesterday.  The server I have runs Apache/Mysql and will be setup at http://weather.vinesandrushes.com

You might have to hack my stuff some to connect to MySQL and use that. 

It's literally one file to change on the WS-1001, and then the code on the webserver.

Your site gives me a permission denied ATM.  (I can help with that too )

[Jáchym]

I can confirm that, your site just shows foribidden

[ryanprel]

Yeah, I'm just in the process of setting things up right now. 

Received this error when going to http://weather.vinesandrushes.com/weatherstation/updateweatherstation.php

"
Warning: file_get_contents() [function.file-get-contents]: http:// wrapper is disabled in the server configuration by allow_url_fopen=0 in /nfs/c04/h01/mnt/61257/domains/weather.vinesandrushes.com/html/weatherstation/updateweatherstation.php on line 2

Warning: file_get_contents(http://rtupdate.wunderground.com/weatherstation/updateweatherstation.php?) [function.file-get-contents]: failed to open stream: no suitable wrapper could be found in /nfs/c04/h01/mnt/61257/domains/weather.vinesandrushes.com/html/weatherstation/updateweatherstation.php on line 2
"

[Jáchym]

Your server does not have file_get_contents method enabled (which is the main function to get the data).

In my template I use cURL as an alternative for people that have this problem so it might be a solution for you as well.

Change file_get_contents to cURL or see if you can enable file_get_contents in your server settings

[lrosenman]

Your server does not have file_get_contents method enabled (which is the main function to get the data).

In my template I use cURL as an alternative for people that have this problem so it might be a solution for you as well.

Change file_get_contents to cURL or see if you can enable file_get_contents in your server settings

Beware that file_get_contents is used throughout weatherist34's template.....

[ryanprel]

I got allow_url_fopen = 1 enabled which seemed to fix the issue but it's not creating the json file, but also not showing any error.

[lrosenman]

I got allow_url_fopen = 1 enabled which seemed to fix the issue but it's not creating the json file, but also not showing any error.

check permissions on the directory. 

and it may not be writing it where you think.....

[ryanprel]

Permissions are at 755 and nothing was written to that directory or the root.

[lrosenman]

Permissions are at 755 and nothing was written to that directory or the root.

What user is APACHE running as?  It needs to write as THAT user.

On my FreeBSD system, that's www, but the directory etc is owned by wview (historical reasons).

You might want to create the ws1001.json file owned by whatever user apache is running on.

[ryanprel]

Huh, had refreshed the folder before but now went back into it and the json file was there - hadn't changed anything...

[lrosenman]

Huh, had refreshed the folder before but now went back into it and the json file was there - hadn't changed anything...

Based on the path, welcome to the wonderful world of NFS and caches

[ryanprel]

Looks like I don't have a MicroSD on hand so I'll get on that and be back in a few days...

[lrosenman]

Looks like I don't have a MicroSD on hand so I'll get on that and be back in a few days...

IF you have a windows box and a usb cable you can do it with that (the WS-1001 is apparently running Windows CE).

[ryanprel]

Yeah, no windows box.  There was nothing better than Windows CE?