Right.
Because our determination of the earth's curvature is dependent upon indirect observation through data which could have a variety of different causes.
Sarcasm aside, these data samples which you delight in referring to are still sparser than the wealth of measuring devices we have planted throughout the world today. When you compare the average temperature for an entire planet using two different sample sets of vastly different size and origin, the reliability of these compared averages is dubious at best.
Also
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If you really think direct observation is the only way to get accurate data then all of your science teachers ever should be fired.
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Science is rooted in the idea of direct observation as the most reliable and most accurate method of obtaining data. This is, of course, not to say that indirect observation is entirely unreliable. However, errors and complications compound the uncertainty of the conclusions. Thus, direct observation is preferred, and is more accurate and precise.
The conveyance of scientific data secondhand is not to be likened to making observations through extrapolations. This is just a weak analogy.
Jam it back in, in the dark.
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