| A) 
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B) |
C) |
D) |
| A)
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B) |
| C) |
D) |
Examples of contouring different patterns of data. (A) shows a set of
radial lines, and (B) an even grid of data, both with 114 points per square
kilometre. (C) has far too few data points unevenly spread over the same
area (23 data points per square kilometre). The results are seriousl "aliased" - ie spacial information obtained is "wrong". (D) shows the result of contouring an even grid of 453
data points per square kilometre. The contours are lines of constant total magnetic
field strength (in nanoteslas). The data are from a ground magnetometer
investigation of north-west Dartmoor, England.