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New 7Timer! progress (sample included)

May 31st

@学而时习 | 485次浏览(views)

2条评论(comments)

It has been a few days since last report, and today I'm very please to annouce that the graph-generating part of the new system is nearly complete, and you can see a result below:

[[Image:Other/080531a.png|500]]

Please click to see the sample with its original size. Three keypoints have to be note:

  1. Some argue that the forecast time is too short (compare to the 180 hours used now). Over the past two years, we have conduct two monitoring programs about the accuracy vs. forecast hours. The result shows that the accuracy for forecast past 72 hours has draw down significantly (for many test sites, but few inland sites -- that's because the atmospheric enviroment of inland sites are normally quite steable, so it's possible to make long-time forecast with relatively high accuracy), so I decide to discard the forecast past 72 hours for Panel 3 (now it got a new name -- APanel). For those who prefer long-time forecasts, Weatherchart or Weatherman (two other products of 7Timer!) is other choices, but the development of Weatherman is not included in this developing circle.
  2. For some reasons, the "darkness" function does _not_ consider that artificial light pollution, different from what I had note. I'm sorry about this...
  3. The sample module works fine, but only one problem that I have nothing can do about it -- as the "graph" is generated in realtime, it may take several seconds to complete the creating, typically 8-15 seconds if the users aren't many. Not 40+ seconds as shows above -- I was testing how slow is it under heavy connections! But actually I've no idea how will it performs when it's really put into use... let's see.

We still to wait for some time until the new version can be put into test -- there are still many things yet to be done. Stay tuned for updates.

7Timer development

7Timer! development progress

May 16th

@学而时习 | 294次浏览(views)

0条评论(comment)

It has been three weeks since last update. The new Auto-run Pipeline is partly completed, and the models of cloud cover, seeing, transparency, 2-m relative humidity and 4-layer lifted index had been completed. The seeing model is rewrited completely base on much better and much more exact models, so is the model of transparency. Now the transparency has take the absorption of ozone into account, but still not man-made pollution (involved with aerosol, PM2.5, PM10, etc.) yet. Also you will see a 72-hour prediction of 4-layer lifted index, which is a good indicate of unstadabilities of the sky above.

Now the elements of 7Timer!-Panel 3 (there will be three products in the end: Panel 3 for 72-hour astronomical usage, Weatherchart for 384-hour prediction charts, and Weatherman for common-using 384-hour forecast) are: cloud work function (CWF), cloud cover, seeing, transparency, 2-m above ground temperture and relative humidity, 10-m above ground wind speed and direction, 4-layer lifted index, and sky darkness (man-made light pollution considered).

During development phase I, Panel 3, Weatherchart, and a basic web interface (website included) are expected to be completed. Weatherman would be completed in development phase II.

7Timer development

7Timer!-III development resumed

Apr 26th

@学而时习 | 420次浏览(views)

2条评论(comments)

The development of the new version has resumed after a short break, I'm here write a few lines about recent development progress.

One of the new features of the new version will be the ability of forecasting the probability of the occurance of unstadible weather. I'm working on the previous research papers in these two days and try to write a good algorithm -- but the dirty code work is not begin yet. I'm still organizing the whole tasks.

It will have been some days before we can see some result. Stay tuned.

7Timer development

Recent status of 7Timer! development

Apr 10th

@学而时习 | 268次浏览(views)

0条评论(comment)

Hi all,

I apologize -- the pause of development is long enough, I realized this last night by checking the "7Timer!" category on my blog, indeed, nothing has been done after January 21 (the lastest development update). In Feburary I went to Australia, then in March I was busying developing the OVOR, an important program for the survey work of Lulin Sky Survey (to be exactly, it's written for the survey of transients), meanwhile my undergrad study had problems... hydrodynamics and mathmatic-physic method just drove me mad. What a mass...

Anyway, OVOR was able to be released as a beta version yesterday, and then I can come back for 7Timer!. I apologize for you all, especially for those who had wait for such a long time.

As the plan is, I'm now working on the 72-hour astronomical forecast part. I'll not given any expect date this time -- just let you know that the workload is not small. I have to write the module from ground-up this time, as the new 7Timer! will generally using ACSII->php graph, totally different from GrADS direct graph output as now it uses.

Anyway I'll keep you update.

Quanzhi

7Timer development
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    作者遥望天山山脉,谢文鹏于2008年8月9日摄于新疆维吾尔自治区巩乃斯河谷。天山山脉是亚洲中部最大的山脉。

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