[Updated - pictures added for those who don't want to download Google Earth - VJones]
I’m putting up this new thread so that I can initially let visitors here share in benefit of some work I’m been doing recently in reproducing a piece of work done by Ken Mankoff back in February 2008.
Steve Mosher put me on to this work in via a comment he posted on another thread here on DITC, so cheers Mosh!
Now back in February 2008, Mosh and other regulars on CA were contributing to the following thread on CA.
which referred to work that had been done by Ken Mankoff at Columbia University. Ken managed to produce some early versions of Google Earth KML files that interfaced with output from a software data visualization package that he was developing at the time. In Ken’s case he was using the GISS dataset. In my case I’ve used the GHCN V2 dataset (and very shortly the GHCN V3 beta dataset) and I’ve linked to trend charts that I’ve created using a piece of software I’ve developed called TEKTemp. So in effect I’ve replicated Ken’s earlier work but have updated it to the latest available data.
The net result is some very useful Google Earth KML files that I’d like to share just now with visitors to DITC.
I strongly recommend that you download and install Google Earth on your PC/laptop as it will be well worth a few minutes of your time. Google Earth can be downloaded by clicking on the following link.
If you don’t want Google Chrome as part of the download don’t forget to untick the tick boxes at the top of the agreement page.
Next click on the following link to download the KML files I’ve produced so far
Thus far I’ve provided two KML files.
The first link listed on that page shows a coloured dot for stations in the GHCN V2 that have at least 10 years of data recorded (not necessarily in consecutive years) any at time during the 1880 to 2010 time period.
The second link listed on that page shows a coloured dot for stations in the GHCN V2 that have at least 50 years of data recorded (not necessarily in consecutive years) any at time during the 1880 to 2010 time period; all other stations i.e. with less than 50 years of data are coloured with a white dot.
It’s very interesting to load up and contrast the two KML files. The first shows lots of ‘dark red dots’ (which means a warming trend in excess of 5 deg.C/century) especially just north of the 49th parallel in Canada. But when you look at the same stations in the second KML file, pretty much all of them are coloured with a white dot i.e. for nearly all of these (future CAGW so ‘we must act now’) stations there is less than 50 years of data available in the GHCN v2 dataset for these stations. In particular what data is available is mostly for the post 1950 period so most importantly not many of these Canadian stations have much if any data available during the 1910 to 1940 warming period, which means that this important warming period can’t be directly contrasted with the 1970 to 2010 warming period for the same stations.
Similarly just look at how many white dots there are in the other continents, especially Africa and Australia. It seems that there are very few long lived stations in either of these two key continents.