By Ed Caryl
Yesterday, I resumed some temperature analysis I had been doing and found an amazing improvement in the GISS website for station data.
Instead of the tiny map with no station locations marked on it, I found a nice rotatable and zoomable globe with dots marking the station locations. There is also now a time window selector, making it much easier to find long and/or recent temperature records.
Figure 1: Screen grab of the station data selector screen on the GISS website here.
In this screen, there is also a selector for the data set. The selections are: GHCN V3 unadjusted, GHCN V3 adjusted, GHCN V3 adjusted and cleaned, and GHCN V3 adjusted, cleaned, and homogenized.
When a station is selected, these selections will be the downloaded data. But, all these are visible, and highlightable, on the graph for each station. When you hover the cursor over a station dot, the station name, the station number, the latitude and longitude, the station altitude, and the record beginning and end dates.
Here is a typical graph, this one for Churchill, Manitoba, Canada.
Figure 2: Temperature chart for Churchill. As you hover the cursor over the legend, the corresponding data is highlighted.
At the bottom of this page are the links to the images and data. These have also been improved with more selections.
These improvements have made it much easier to explore the temperature data available and the homogenization adjustments that have been applied. Keep in mind that these data, even the unadjusted data, have been somewhat manipulated by GHCN and NCDC.