The D'Aleo/Watts report has come under justified criticism for it's silly claims about marching thermometers etc, amplified into claims about malfeasance by various scientific groups.
But there's one little thing that particularly bugs me, because I have pointed it out more than once, but it makes no difference. They say
"See the huge dropout of data in Africa, Canada and Siberia in the two maps from NASA GISS
with 250 km smoothing from 1978 to 2008"
and show these pictures:
Well, yes, quite a reduction in going from 1978 to 2008. But actually, if you go to the GISS site and ask for April 2008, what you see is not nearly as sparse.
So what is going on?
I managed to track down where the SPPI image came from. Bob Tisdale has a version of it in a post dated May 20 2008. It's an early version (current when he posted it), made with an early batch of data that came in for that month. And it's compared with the full version of April 1978.
It's a bit like that Langoliers post. But it just keeps turning up.