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How to Compare Different Maps for Accuracy
Written: 2006.05.02 by: Robin Tivy

Starting point for comparing map accuracy.

See also [Pgx2282-Map Data Accuracy]. In the old days, you could assume that a 1:20,000 map had more detail than a 1:50,000, and that a map with 20m contours had more detail than one with 40m contours. But it is becoming increasingly obvious that this simple comparison can mislead you. You can blow up any map to any scale, and a computer can generate any number of contours. So for marketing reasons, some maps are "over interpolated". More contours does not necessarily mean more accuracy. If you have the actual maps in your hand, then its easy to compare two maps. Just look at a sample of

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