Slide 5 in this series.
Note the vertical scale in the graph below. It is significant. This encroachment of urbanity which encompasses a more rural setting where the measurement has been taken for some years has lead to an error in the measured land measurements. Such cases as the one shown below are numerous and well-documented. It did requre this level of unambiguous documentation in order to show the errors in land measurements.
Errors of these kind still exist and have been verified.
NEXT: Moving on to the processing of data slide.
A full range of topics on how global temperature works, is reported, adjusted, and some insignts into its accuracy.