A must read.

Alastair Aitchison

Many people (whether influenced more by Einstein’s special theory of relativity or the TARDIS) think of space and time as intricately linked dimensions; we describe the position of an object in space using three dimensions, and time represents the fourth dimension. Doctor Who, in his multi-dimensional policebox, is capable both of travelling throughout the universe and throughout the ages.

The concept of four-dimensional spacetime was challenged recently by a group of scientists who argue that time, in itself, is not a fundamental entity – it is merely a measure of the numerical order of changes in space. Nevertheless, whether dimension or not, time is a crucial factor to consider when interpreting spatial data. We not only need to know where something is, but when it was there.

Time and Maps

One commonquestionasked on the MSDN Bing Maps forum concerns the timeliness of the base map data…

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