Thanks for the topic.

As one who has used old data for trend analysis and environmental change I have found that not only the media the data is one degrades over time but the data itself often does. The idea here is that the instrument and the calibration of the instrument that took the readings that became the data is so inaccurate compared to the current methods and technology of taking the same reading today that old data must be accompanied with a caveat.

Some old data is very valuable, and old pictures are great. We need to find ways to keep it so those grandchildren do have a record.

M.