Thursday, April 14, 2011

Quiet time

Paleo plotting - new draft cliate plotter

In the previous post, in response to a challenge posed by Gavin at Real Climate for better ways of visualizing Phanerozoic climate data, I showed an interactive plot mechanism which could allow the user to easily vary the time scale in a single plot environment. The mechanics really come from the Moyhu climate plotter, and I've been meaning to work up a new version of that (and it's time to update with 2013 data).

A limitation in the V2 plotter was a restriction to annual data, and it generally covered the instrumental period. This reduced the data size, which is of some importance if all the data has to be downloaded. It also facilitates post processing - eg combining or smoothing series.

In V3 I've allowed all kinds of time data. I can overcome the size p[roblem by using XMLHTTPrequest, so only requested data is downloaded. And to allow the user to easily go from a century timescale to decade (for monthly data) or million years, I need to upgrade the user controls. Also to show monthly data, I will need an automatic updating system.

I'm posting a draft version here. It doesn't yet have request download, though download times are reasonable. And a lot of the post-processing doesn't yet work. Smoothing and regresion are patchy, and the calculate facility will probably go. But the basic plotting should work, and I'd be interested in comments, especially of datasets to include.

Saturday, April 9, 2011

TempLS Ver 2.1 release

This is the first release for a while. The structure is still much like ver 2, and the math basis is the same. The main differences are:
  • The code has been internally reorganized. Most variables have been gathered into R-style lists. And more code has been sequestered into functions, to clarify the underlying structure of the program.
  • The new work on area-based weighting has been incorporated.
  • Other work has been done with weighting. In particular, subsets of stations can be weighted differently relative to each other.
  • Hooks have been added so that the adaptions to the Antarctic studies can be included.

The preprocessor which merges and converts data files available on the web to a standard TempLS format is unchanged. Data and inventory files from Ver 2 will still work.

A reminder of how TempLS is used. In an R environment, a jobname is defined, and a .r file with that name is created which defines some variables relevant to the wanted problem. This may have several consecutive runs defined. The variables are variants of supplied defaults.

Then source("TempLSv2.1.r") solves and writes data and jpg files to a directory jobname.

The files you need are on a zip file This 16Mb file contains preprocessed data sets, so you won't need to use the preprocessor. I've had to separate GSOD data; is another 7 Mb.

If you just want to look at the code and information (everything readable), there is a 170 Kb A ReadMe.txt file is included. There is also a partly updated manual from V2.0, most of which is still applicable. More details below, and past files on TempLS can be found on the Moyhu index. I'll describe below the things that are new.

Monday, April 4, 2011

Blogger's spam filter

In about September last year, Blogger, the Google outfit that host this site, introduced a new spam filter. Until that time I had been very happy with them. I still am, in most aspects. But the spam filter is making dialogue on the site impossible. It is supposed to learn from the liberations that I make, but it seems to be just getting worse. I have not yet been blest with a single item of real spam, but about one in three genuine comments go to the bin for no obvious reason at all.

The problem is compounded because, since I'm on Australian time, they can sit in the spam bin for hours before I can fix it.

I've done what I can to raise the problem with Blogger. They don't offer direct communication, but delegate feedback to a forum. The response is that, no, you don't get a choice here, your sacrifice is for the general good.  We seem to be conscripted into an experiment whereby Google uses our rescue activity to improve its spam database.

So I'm looking at Wordpress. Blogger has just announced a revamp, but from their aggressive attitude about the filter, I don't see much hope. I'll wait a few days longer, and listen to advice on whether Wordpress is likely to be better, but it's looking inevitable.