NASA Can't Measure Temperature Accurately

Their algorithm creates an imaginary hot spot at the North Pole (2-4 C based on no actual data within 800 km) and then weights it as heavily as a closer measured temperature reading, in the next step.

They appear to be using at least two steps of extrapolation/interpolation – which compounds error. In other words, their entire 21st century warming story is based on a defective interpretation of the Arctic.

“A likely explanation for discrepancy in identification of the warmest year is the fact that the HadCRUT analysis excludes much of the Arctic ….. (whereas GISS) estimates temperature anomalies throughout most of the Arctic.”

The GISS article with this statement has disappeared from their web site, but it used to be at http://data.giss.nasa.gov/gistemp/paper/gistemp2010_draft0319.pdf.